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2016 Volume 32 Issue 12
2016, 32(12): 2069-2074
doi: 10.11862/CJIC.2016.274
Abstract:
A fluorescent probe 2-((2-(benzo[d]thiazol-2-yl)hydrazono)methyl)-5-(diethylamino)phenol (BHP) was designed and synthesized as a Zn2+ selective fluorescent chemosensor. It demonstrates Zn2+-specific emission enhancement, while many other ions such as Cd2+, Fe2+, Ni2+, Pb2+, Hg2+, Al3+, Mn2+, Ag+, Cu2+, Co2+, Na+, K+, Mg2+ and Ca2+, have no response. Notably, this chemosensor can distinguish Zn2+ from Cd2+. Its binding stoichiometry with Zn2+ is 1:1 ratio. Its pH-independent Zn2+-induced emission enhancement in physiological condition and cell permeability make it an effective intracellular Zn2+ imaging agent.
A fluorescent probe 2-((2-(benzo[d]thiazol-2-yl)hydrazono)methyl)-5-(diethylamino)phenol (BHP) was designed and synthesized as a Zn2+ selective fluorescent chemosensor. It demonstrates Zn2+-specific emission enhancement, while many other ions such as Cd2+, Fe2+, Ni2+, Pb2+, Hg2+, Al3+, Mn2+, Ag+, Cu2+, Co2+, Na+, K+, Mg2+ and Ca2+, have no response. Notably, this chemosensor can distinguish Zn2+ from Cd2+. Its binding stoichiometry with Zn2+ is 1:1 ratio. Its pH-independent Zn2+-induced emission enhancement in physiological condition and cell permeability make it an effective intracellular Zn2+ imaging agent.
2016, 32(12): 2075-2081
doi: 10.11862/CJIC.2016.237
Abstract:
Sr2+, Eu2+ and Mn2+ tri-doped BaMgAl10O17 (BAM) phosphors that emitting the blue-green light are prepared by solution combustion synthesis at 600℃. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) are employed to measure the powders crystallinity, morphology and luminescent properties, respectively. The results show that the formation temperature of the BAM phase by the solution combustion synthesis (SCS) method is significantly lower than that of a high temperature solid state (HTS) reaction. The nanorods of SBAM:Eu2+, Mn2+ without aggregation and well distribution are synthesized successfully. The well-dispersed morphology of the SCS-derived phosphors is beneficial to the improvement of PL property. While Sr2+ ions are introduced, the PL property have been further enhanced, and the PL intensity can up to 1.8 times as high of that BAM specimen obtained by the HTS method. The xy CIE chromaticity coordinates of SBAM:0.1Eu2+, 0.04Mn2+ phosphor is presented at (0.146, 0.250), located at the blue-green reign.
Sr2+, Eu2+ and Mn2+ tri-doped BaMgAl10O17 (BAM) phosphors that emitting the blue-green light are prepared by solution combustion synthesis at 600℃. X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence (PL) are employed to measure the powders crystallinity, morphology and luminescent properties, respectively. The results show that the formation temperature of the BAM phase by the solution combustion synthesis (SCS) method is significantly lower than that of a high temperature solid state (HTS) reaction. The nanorods of SBAM:Eu2+, Mn2+ without aggregation and well distribution are synthesized successfully. The well-dispersed morphology of the SCS-derived phosphors is beneficial to the improvement of PL property. While Sr2+ ions are introduced, the PL property have been further enhanced, and the PL intensity can up to 1.8 times as high of that BAM specimen obtained by the HTS method. The xy CIE chromaticity coordinates of SBAM:0.1Eu2+, 0.04Mn2+ phosphor is presented at (0.146, 0.250), located at the blue-green reign.
2016, 32(12): 2082-2087
doi: 10.11862/CJIC.2016.272
Abstract:
CoOOH was synthesized by a simple one-step co-precipitation method, and used as cathode catalyst in non-aqueous Li-O2 batteries. The introduction of CoOOH could catalyze the oxygen reduction reaction (ORR) upon discharge, making the CoOOH-contained cathode display a high discharge capacity of 5 093 mAh·g-1, which was about 1.7 times higher than that of the CoOOH-free cathode. Furthermore, the CoOOH-contained cathode exhibited a significantly reduced recharge overpotential (460 mV), enhancing recharge-ability. Thus, the reversibility was improved, and the cycling performance was ameliorated.
CoOOH was synthesized by a simple one-step co-precipitation method, and used as cathode catalyst in non-aqueous Li-O2 batteries. The introduction of CoOOH could catalyze the oxygen reduction reaction (ORR) upon discharge, making the CoOOH-contained cathode display a high discharge capacity of 5 093 mAh·g-1, which was about 1.7 times higher than that of the CoOOH-free cathode. Furthermore, the CoOOH-contained cathode exhibited a significantly reduced recharge overpotential (460 mV), enhancing recharge-ability. Thus, the reversibility was improved, and the cycling performance was ameliorated.
2016, 32(12): 2088-2094
doi: 10.11862/CJIC.2016.279
Abstract:
g-C3N4/C composite nanofibers were prepared via a combination process of electrospinning, preoxidation and carbonization by using g-C3N4 nanosheets and polyacrylonitrile as raw materials. Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), Raman spectroscopy (Raman) and scanning electron microscopy (SEM) were employed to analyze the structure and morphology of the as-synthesized nanofibers. And UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) was used to assess their visible light response. The results show that the g-C3N4/C composite nanofibers exhibit good photocatalytic degradation activity toward rhodamine B under visible light, which originates from better ability of their partially amorphous carbon matrix to reduce the combination of the photogenerated electron and hole pair. The nanofiber membrane was not embrittled into powers or small flakes during the photocatalytic degradation process under stirring conditions, maintaining its integrity from begin to end. After several recovery and photocatalysis experiments, the membrane still maintained high photodegradation rate. This study reveals that the resulting nanofibers have excellent recycling stability to photodegradate rhodamine B under visible light.
g-C3N4/C composite nanofibers were prepared via a combination process of electrospinning, preoxidation and carbonization by using g-C3N4 nanosheets and polyacrylonitrile as raw materials. Fourier transform infrared spectrometer (FTIR), X-ray diffraction (XRD), Raman spectroscopy (Raman) and scanning electron microscopy (SEM) were employed to analyze the structure and morphology of the as-synthesized nanofibers. And UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS) was used to assess their visible light response. The results show that the g-C3N4/C composite nanofibers exhibit good photocatalytic degradation activity toward rhodamine B under visible light, which originates from better ability of their partially amorphous carbon matrix to reduce the combination of the photogenerated electron and hole pair. The nanofiber membrane was not embrittled into powers or small flakes during the photocatalytic degradation process under stirring conditions, maintaining its integrity from begin to end. After several recovery and photocatalysis experiments, the membrane still maintained high photodegradation rate. This study reveals that the resulting nanofibers have excellent recycling stability to photodegradate rhodamine B under visible light.
2016, 32(12): 2095-2101
doi: 10.11862/CJIC.2016.271
Abstract:
A new method for improving the accuracy of DNA detection has been developed, which was based on the base stacking principle and the fluorescence of NaYF4:Yb, Er UCNPs. Firstly, the NaYF4:Yb, Er UCNPs were synthesized by thermal decomposition method and functionalized with denatured bovine serum albumin. Then, the denatured bovine serum albumin-functionalized OA/NaYF4:Yb, Er UCNPs were conjugated with amino group-modified DNA probes to form upconversion fluorescence labeled probes and detect DNA. The results showed that the method of using the fluorescence of NaYF4:Yb, Er UCNPs as a reference standard to quantitatively detect target DNA concentration had higher accuracy than that of only using a single FAM fluorescence intensity, and the operation and equipment errors was effectively avoid during the experiment. Moreover, this method can reach the detection limit as low as 5 nmol·L-1 without amplification, displays a good linear relationship in wide concentration range and a high specificity, and also can effectively differenciate single-base mismatch sequences.
A new method for improving the accuracy of DNA detection has been developed, which was based on the base stacking principle and the fluorescence of NaYF4:Yb, Er UCNPs. Firstly, the NaYF4:Yb, Er UCNPs were synthesized by thermal decomposition method and functionalized with denatured bovine serum albumin. Then, the denatured bovine serum albumin-functionalized OA/NaYF4:Yb, Er UCNPs were conjugated with amino group-modified DNA probes to form upconversion fluorescence labeled probes and detect DNA. The results showed that the method of using the fluorescence of NaYF4:Yb, Er UCNPs as a reference standard to quantitatively detect target DNA concentration had higher accuracy than that of only using a single FAM fluorescence intensity, and the operation and equipment errors was effectively avoid during the experiment. Moreover, this method can reach the detection limit as low as 5 nmol·L-1 without amplification, displays a good linear relationship in wide concentration range and a high specificity, and also can effectively differenciate single-base mismatch sequences.
2016, 32(12): 2102-2108
doi: 10.11862/CJIC.2016.269
Abstract:
In order to explore the effect of urine components with different charges on micron/nano urinary crystallites, the adsorption difference of three surfactants with different charges onto micron/nano calcium oxalate monohydrate (COM) and dihydrate (COD) was studied, including anionic surfactant sodium diisooctyl sulfosuccinate (AOT), cationic surfactant cetyltrimethylammonium bromide (CTAB), and nonionic surfactant nonylphenol ethoxylate (NP-40). The adsorption quantity of surfactants on COM and COD was ranked in the following order:AOT > CTAB > NP-40, that is, the absorption quantity of anionic surfactant is the maximum, and absorption quantity of nonionic surfactant is the minimum. The adsorption quantity of COM was greater than COD with the same size; the absolute value of ζ potential on surface of COM and COD was increased after adsorption of surfactants, it was conducive to inhibit crystal aggregation and sedimentation. The molecular models of surfactants adsorbed on crystal surface were proposed. There are different interactions between micro/nano COM, COD crystal and anionic, cationic, nonionic surfactants. The larger the adsorption quantity of surfactants is, the slower the sedimentation rate is, so the stabilizing effect on crystal suspension is more obvious.
In order to explore the effect of urine components with different charges on micron/nano urinary crystallites, the adsorption difference of three surfactants with different charges onto micron/nano calcium oxalate monohydrate (COM) and dihydrate (COD) was studied, including anionic surfactant sodium diisooctyl sulfosuccinate (AOT), cationic surfactant cetyltrimethylammonium bromide (CTAB), and nonionic surfactant nonylphenol ethoxylate (NP-40). The adsorption quantity of surfactants on COM and COD was ranked in the following order:AOT > CTAB > NP-40, that is, the absorption quantity of anionic surfactant is the maximum, and absorption quantity of nonionic surfactant is the minimum. The adsorption quantity of COM was greater than COD with the same size; the absolute value of ζ potential on surface of COM and COD was increased after adsorption of surfactants, it was conducive to inhibit crystal aggregation and sedimentation. The molecular models of surfactants adsorbed on crystal surface were proposed. There are different interactions between micro/nano COM, COD crystal and anionic, cationic, nonionic surfactants. The larger the adsorption quantity of surfactants is, the slower the sedimentation rate is, so the stabilizing effect on crystal suspension is more obvious.
2016, 32(12): 2109-2116
doi: 10.11862/CJIC.2016.267
Abstract:
MoO42- polyanion was tried to substitute for PO43- partially in the Li3Fe2(PO4)3 compound. The results proved that the introduced MoO42- anions mainly dissolved in the Li3Fe2(PO4)3 and the corresponding electrochemical properties were improved apparently. Among the MoO42- substituted materials, the sample with MoO42- content of 0.3 presented the excellent electrochemical properties. Its initial discharging capacity was 113.7 mAh·g-1 at a rate of 0.5C, which was about 20.7% higher than that without any MoO42-. The capacity retention was about 94% at a rate of 0.5C after 60 cycles. Moreover, this material could restore 95% of the initial capacity when the discharging rate was reset back to 0.5C even after higher cycling rate of 5C. The boost in electrochemical properties for the MoO42- substituted samples is ascribed to the synergistic effects of improved redox ability, decreased potential polarization and charge transfer resistance as well as increased diffusion coefficient of lithium ions.
MoO42- polyanion was tried to substitute for PO43- partially in the Li3Fe2(PO4)3 compound. The results proved that the introduced MoO42- anions mainly dissolved in the Li3Fe2(PO4)3 and the corresponding electrochemical properties were improved apparently. Among the MoO42- substituted materials, the sample with MoO42- content of 0.3 presented the excellent electrochemical properties. Its initial discharging capacity was 113.7 mAh·g-1 at a rate of 0.5C, which was about 20.7% higher than that without any MoO42-. The capacity retention was about 94% at a rate of 0.5C after 60 cycles. Moreover, this material could restore 95% of the initial capacity when the discharging rate was reset back to 0.5C even after higher cycling rate of 5C. The boost in electrochemical properties for the MoO42- substituted samples is ascribed to the synergistic effects of improved redox ability, decreased potential polarization and charge transfer resistance as well as increased diffusion coefficient of lithium ions.
2016, 32(12): 2117-2128
doi: 10.11862/CJIC.2016.277
Abstract:
Electrochemical methods including cyclic voltammetry, differential pulse voltammetry, electrochemical impedance spectrometry and chronoamperometry, together with auxiliary means such as F-T infrared spectrometry, Ultra-violet visible spectrometry, atomic force microscopy, transmission electron microscopy and atomic adsorption spectrometry were used to characterize the chemical composition, structure and morphology of polyaniline-CoC2O4 nano-composite, to measure the change of conductivity in nano-composite before and after Laccase immobilization and to investigate the direct electrochemistry of redox protein molecules entrapped in the matrix. Its catalytic effect on oxygen reduction reaction and performance as electrochemical sensor for oxygen detection were evaluated subsequently. Results from tests indicated this Laccase-based electrode shuttled electrons from enzyme active site T2 as primary electron acceptor to dioxygen molecules attached chemically in the matrix, achieving the electro-reduction of O2 in the absence of any external mediator with its apparent electron transferring rate:0.017 s-1. This laccase-based electrode displayed favorable catalytic effect on oxygen reduction reaction (onset potential for catalysis:460 mV vs NHE, apparent turn-over frequency for oxygen reduction reaction:2.6×10-4 s-1). Enzymatic oxygen electro-reduction into water should be ascribed to the key process to promote the performance of biocathode. This Laccase based electrochemical sensor had such advantages as extremely low detection limit (0.20 μmol·L-1) to oxygen monitoring, wide linear responding range of concentration (0.4~7.5 μmol·L-1) and high affinity towards substrate (KM=122.4 μmol·L-1).
Electrochemical methods including cyclic voltammetry, differential pulse voltammetry, electrochemical impedance spectrometry and chronoamperometry, together with auxiliary means such as F-T infrared spectrometry, Ultra-violet visible spectrometry, atomic force microscopy, transmission electron microscopy and atomic adsorption spectrometry were used to characterize the chemical composition, structure and morphology of polyaniline-CoC2O4 nano-composite, to measure the change of conductivity in nano-composite before and after Laccase immobilization and to investigate the direct electrochemistry of redox protein molecules entrapped in the matrix. Its catalytic effect on oxygen reduction reaction and performance as electrochemical sensor for oxygen detection were evaluated subsequently. Results from tests indicated this Laccase-based electrode shuttled electrons from enzyme active site T2 as primary electron acceptor to dioxygen molecules attached chemically in the matrix, achieving the electro-reduction of O2 in the absence of any external mediator with its apparent electron transferring rate:0.017 s-1. This laccase-based electrode displayed favorable catalytic effect on oxygen reduction reaction (onset potential for catalysis:460 mV vs NHE, apparent turn-over frequency for oxygen reduction reaction:2.6×10-4 s-1). Enzymatic oxygen electro-reduction into water should be ascribed to the key process to promote the performance of biocathode. This Laccase based electrochemical sensor had such advantages as extremely low detection limit (0.20 μmol·L-1) to oxygen monitoring, wide linear responding range of concentration (0.4~7.5 μmol·L-1) and high affinity towards substrate (KM=122.4 μmol·L-1).
2016, 32(12): 2129-2135
doi: 10.11862/CJIC.2016.270
Abstract:
One-dimensional trigonal-selenium (t-Se) nanostructures were synthesized using environment-friendly and one-step hydrothermal process, using GeSe4 glass as raw material in aqueous solution at 80℃. The morphologies and structures of these one-dimensional selenium products were characterized by transmission electron microscope (TEM), Raman spectrometry, scanning electron microscope (SEM) and atomic force microscope (AFM). The experimental results show that the Se nanofibers were grown along[001] direction with a hexagonal cross section. After 144 h of reaction, the length and diameter of Se nanofibers reached millimeter scale and 1~5 μm respectively. AFM based nanoindentation test reported that the hardness and elastic modulus of Se nanofibers were (399.5±20.4) MPa and (1.13±0.05) GPa respectively. The growth speed of Se nanofibers at pH=12.0 (80℃) was faster than that at pH=3.3 and pH=6.3. Se nanofibers were typically 344 μm long and 1.12 μm in diameter after 24 h of reaction in alkaline medium.
One-dimensional trigonal-selenium (t-Se) nanostructures were synthesized using environment-friendly and one-step hydrothermal process, using GeSe4 glass as raw material in aqueous solution at 80℃. The morphologies and structures of these one-dimensional selenium products were characterized by transmission electron microscope (TEM), Raman spectrometry, scanning electron microscope (SEM) and atomic force microscope (AFM). The experimental results show that the Se nanofibers were grown along[001] direction with a hexagonal cross section. After 144 h of reaction, the length and diameter of Se nanofibers reached millimeter scale and 1~5 μm respectively. AFM based nanoindentation test reported that the hardness and elastic modulus of Se nanofibers were (399.5±20.4) MPa and (1.13±0.05) GPa respectively. The growth speed of Se nanofibers at pH=12.0 (80℃) was faster than that at pH=3.3 and pH=6.3. Se nanofibers were typically 344 μm long and 1.12 μm in diameter after 24 h of reaction in alkaline medium.
2016, 32(12): 2136-2142
doi: 10.11862/CJIC.2016.284
Abstract:
Ca9Y(PO4)7:Ce3+,Tb3+ nano-phosphors were synthesized by hydrothermal method. X-ray diffraction (XRD), Scanning electron microscope (SEM) and Photoluminescence (PL) spectra and so on were used to characterize the samples. The effects of Ce3+ and Tb3+ on the luminescence properties of Ca9Y(PO4)7:Ce3+,Tb3+ was studied in detail. The result indicates that the luminescence color of Ca9Y(PO4)7:Tb3+ can be tuned through adjusting the concentration of Tb3+, which is attributed to the energy cross relaxation of Tb3+. And the energy transfer mechanism of Ce3+-Tb3+ was dipole-quadrupole mechanism of electric multipole interactional, the biggest energy transfer efficiency was 55.6%. The emission color of Ca9Y(PO4)7:Ce3+,Tb3+ can be tuned by the energy transfer of ions and the total emission of activators. SEM showed that the samples had good dispersion, and the particle size of phosphors was about 100 nm.
Ca9Y(PO4)7:Ce3+,Tb3+ nano-phosphors were synthesized by hydrothermal method. X-ray diffraction (XRD), Scanning electron microscope (SEM) and Photoluminescence (PL) spectra and so on were used to characterize the samples. The effects of Ce3+ and Tb3+ on the luminescence properties of Ca9Y(PO4)7:Ce3+,Tb3+ was studied in detail. The result indicates that the luminescence color of Ca9Y(PO4)7:Tb3+ can be tuned through adjusting the concentration of Tb3+, which is attributed to the energy cross relaxation of Tb3+. And the energy transfer mechanism of Ce3+-Tb3+ was dipole-quadrupole mechanism of electric multipole interactional, the biggest energy transfer efficiency was 55.6%. The emission color of Ca9Y(PO4)7:Ce3+,Tb3+ can be tuned by the energy transfer of ions and the total emission of activators. SEM showed that the samples had good dispersion, and the particle size of phosphors was about 100 nm.
2016, 32(12): 2143-2150
doi: 10.11862/CJIC.2016.275
Abstract:
(Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ(PLNCG) is prepared by EDTA-citrate process, and forms composite cathode with Ce0.9Gd0.1O2-δ(CGO). XRD and SEM results demonstrate that PLNCG is chemical compatible with CGO at 1 000℃. The electrochemical measurements show that the polarization resistance (Rp) of PLNCG-30%CGO is 0.092 Ω·cm2 at 700℃. When the current density reaches 113.3 mA·cm-2, the cathode overpotential is only 39.3 mV at 700℃ in air. The oxygen partial pressure dependence of Rp indicates that the rate limiting step of the composite cathode is charge transfer process. The maximum power density of anode-support single cell (Ni-CGO/CGO/PLNCG-30%CGO) reaches 569 mW·cm-2 at 700℃ with open circuit voltage (OCV) of 0.76 V.
(Pr0.9La0.1)2(Ni0.74Cu0.21Ga0.05)O4+δ(PLNCG) is prepared by EDTA-citrate process, and forms composite cathode with Ce0.9Gd0.1O2-δ(CGO). XRD and SEM results demonstrate that PLNCG is chemical compatible with CGO at 1 000℃. The electrochemical measurements show that the polarization resistance (Rp) of PLNCG-30%CGO is 0.092 Ω·cm2 at 700℃. When the current density reaches 113.3 mA·cm-2, the cathode overpotential is only 39.3 mV at 700℃ in air. The oxygen partial pressure dependence of Rp indicates that the rate limiting step of the composite cathode is charge transfer process. The maximum power density of anode-support single cell (Ni-CGO/CGO/PLNCG-30%CGO) reaches 569 mW·cm-2 at 700℃ with open circuit voltage (OCV) of 0.76 V.
2016, 32(12): 2151-2157
doi: 10.11862/CJIC.2016.233
Abstract:
3D metastable orthorhombic AgInS2 and hexagonal CuInS2 flowerlike microsphere were synthesized by the thermolysis method. The obtained products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), and the photocatalytic activity of AgInS2 were investigated. Furthermore, the possible growth mechanism of metastable orthorhombic AgInS2 and hexagonal CuInS2 flowerlike microsphere was also proposed by means of thermogravimetric thermogravimetric and differential thermal analysis (TG-DTA). The results indicated that both the reaction temperature and feed ratio of metallic ion (nM/nIn) had an influence on the formation of pure-phase MInS2, and the prepared AgInS2 flowerlike microsphere could well degrade methylene blue (MB) under visible light irradiation.
3D metastable orthorhombic AgInS2 and hexagonal CuInS2 flowerlike microsphere were synthesized by the thermolysis method. The obtained products were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), and the photocatalytic activity of AgInS2 were investigated. Furthermore, the possible growth mechanism of metastable orthorhombic AgInS2 and hexagonal CuInS2 flowerlike microsphere was also proposed by means of thermogravimetric thermogravimetric and differential thermal analysis (TG-DTA). The results indicated that both the reaction temperature and feed ratio of metallic ion (nM/nIn) had an influence on the formation of pure-phase MInS2, and the prepared AgInS2 flowerlike microsphere could well degrade methylene blue (MB) under visible light irradiation.
2016, 32(12): 2158-2164
doi: 10.11862/CJIC.2016.276
Abstract:
Ag2S/Ag3PO4/Ni composite thin films were prepared by electrochemical method. The surface morphology, phase structure, optical characteristics and band structure of the thin film were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), respectively. Its photocatalytic properties and stability were evaluated with rhodamine B (RhB) as a model compound. Using a method of adding active species scavenger to the solution, mechanism of photocatalytic degradation of the film was explored. The results show that the Ag2S/Ag3PO4/Ni thin film is composed of uniform spherical nanoparticles. The photocatalytic activity of the as-prepared Ag2S/Ag3PO4/Ni thin film was higher than those of pure Ag3PO4/Ni thin film and Ag2S/Ni thin film respectively. The film maintains nearly 100% of their corresponding initial photocatalytic activity after 6 cycles. Furthermore, the photodegradation mechanism of the composite films for RhB under the visible light was preliminary proposed.
Ag2S/Ag3PO4/Ni composite thin films were prepared by electrochemical method. The surface morphology, phase structure, optical characteristics and band structure of the thin film were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), respectively. Its photocatalytic properties and stability were evaluated with rhodamine B (RhB) as a model compound. Using a method of adding active species scavenger to the solution, mechanism of photocatalytic degradation of the film was explored. The results show that the Ag2S/Ag3PO4/Ni thin film is composed of uniform spherical nanoparticles. The photocatalytic activity of the as-prepared Ag2S/Ag3PO4/Ni thin film was higher than those of pure Ag3PO4/Ni thin film and Ag2S/Ni thin film respectively. The film maintains nearly 100% of their corresponding initial photocatalytic activity after 6 cycles. Furthermore, the photodegradation mechanism of the composite films for RhB under the visible light was preliminary proposed.
2016, 32(12): 2165-2171
doi: 10.11862/CJIC.2016.273
Abstract:
Two novel silver(Ⅰ) complexes[Ag(DPEphos)(dppe)]2SO4 (1) and[Ag(DPEphos)(SCN)]2·CH2Cl2 (2) (DPEphos=bis(2-(diphenylphosphino)phenyl) ether, dppe=bis(diphenylphosphino)ethane) have been synthesized and characterized by IR, 1H NMR spectroscopy, elemental analysis, single-crystal X-ray diffraction and fluorescence spectra. Structure analysis shows that complex 1 has simple mono-nuclear structures, and each silver atom is chelated by four phosphines. Complex 2 has a bi-nuclear cluster of Ag(Ⅰ), showing weak argentophilic interactions. The sum of the internal angles of the four-member ring[-Ag-S-Ag-S-] in the Ag2S2 core is 360°, demonstrating that the ring is a parallelogram. The luminescent spectra of 1~2 are studied, which show that the emission peaks are assigned to the π-π* transitions of the diphosphine ligands. Thermogravimetric analysis shows that two complexes begin to decompose at around 340℃, indicating their strong stability.
Two novel silver(Ⅰ) complexes[Ag(DPEphos)(dppe)]2SO4 (1) and[Ag(DPEphos)(SCN)]2·CH2Cl2 (2) (DPEphos=bis(2-(diphenylphosphino)phenyl) ether, dppe=bis(diphenylphosphino)ethane) have been synthesized and characterized by IR, 1H NMR spectroscopy, elemental analysis, single-crystal X-ray diffraction and fluorescence spectra. Structure analysis shows that complex 1 has simple mono-nuclear structures, and each silver atom is chelated by four phosphines. Complex 2 has a bi-nuclear cluster of Ag(Ⅰ), showing weak argentophilic interactions. The sum of the internal angles of the four-member ring[-Ag-S-Ag-S-] in the Ag2S2 core is 360°, demonstrating that the ring is a parallelogram. The luminescent spectra of 1~2 are studied, which show that the emission peaks are assigned to the π-π* transitions of the diphosphine ligands. Thermogravimetric analysis shows that two complexes begin to decompose at around 340℃, indicating their strong stability.
2016, 32(12): 2172-2182
doi: 10.11862/CJIC.2016.265
Abstract:
Two new mononuclear complexes[ML(H2O)3]·H2O (M=Mn(1) and Co(2)) of quinoline derivative ligand (Na2L=sodium 8-(carboxylatomethoxy)quinoline-2-carboxylate) have been synthesized and characterized. The complexes are isostructural and both metal centers are heptacoordinated with O6N donor sets and the geometry around metal centers can be best described as distorted pentagonal bipyramidal. Interactions of the complexes with CT-DNA and BSA have been explored by absorption and emission spectral methods. Binding abilities of the complexes to CT-DNA display a relative order:2>1, while the quenching mechanisms of BSA by both complexes are static procedures and the binding constant values follow the order:1>2. In the presence of H2O2 as a revulsant or an activator, compared with complex 1, the DNA cleavage efficiency of 2 exhibited more remarkable increases at the same conditions. Oxidative mechanism has been demonstrated by adding standard radical scavengers and the reactive oxygen species (ROS) responsible for the DNA cleavage is likely hydroxyl radicals (OH·).
Two new mononuclear complexes[ML(H2O)3]·H2O (M=Mn(1) and Co(2)) of quinoline derivative ligand (Na2L=sodium 8-(carboxylatomethoxy)quinoline-2-carboxylate) have been synthesized and characterized. The complexes are isostructural and both metal centers are heptacoordinated with O6N donor sets and the geometry around metal centers can be best described as distorted pentagonal bipyramidal. Interactions of the complexes with CT-DNA and BSA have been explored by absorption and emission spectral methods. Binding abilities of the complexes to CT-DNA display a relative order:2>1, while the quenching mechanisms of BSA by both complexes are static procedures and the binding constant values follow the order:1>2. In the presence of H2O2 as a revulsant or an activator, compared with complex 1, the DNA cleavage efficiency of 2 exhibited more remarkable increases at the same conditions. Oxidative mechanism has been demonstrated by adding standard radical scavengers and the reactive oxygen species (ROS) responsible for the DNA cleavage is likely hydroxyl radicals (OH·).
