Citation: ZHANG Cui-Zhong, ZHANG Zhen-Fa, LIAN Huan, LIANG Cai-Yun, LI Kai, PENG Jin-Yun. Copper Nanoparticles/Poly Acrylic Acid/Reduced Graphene Oxide Nanocomposite Modified Glassy Carbon Electrode for Determination of 4-Nitrophenol in Water[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(1): 28-34. doi: 10.11895/j.issn.0253-3820.160606 shu

Copper Nanoparticles/Poly Acrylic Acid/Reduced Graphene Oxide Nanocomposite Modified Glassy Carbon Electrode for Determination of 4-Nitrophenol in Water

ZHANG Cui-Zhong ^1,2, ,
ZHANG Zhen-Fa ^1,2 ,
LIAN Huan ^1,2 ,
LIANG Cai-Yun ^1,2 ,
LI Kai ¹ ,
PENG Jin-Yun ^1,2

1.
Guangxi Normal University for Nationalities, Chongzuo 532200, China;
2.
Guangxi Colleges and Universities Key Laboratory Breeding Base of Chemistry of Guangxi Southwest Plant Resources, Chongzuo 532200, China

Received Date: 15 August 2016
Revised Date: 20 November 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No.21465004)

A moderate and simple in situ growth approach was employed to load copper nanoparticles (CuNPs) noncovalently on graphene for preparation of CuNPs/poly acrylic acid/reduced graphene oxide (CuNPs/PAA/GR) nanocomposites for electro-catalysis of 4-nitrophenol (4-NP). The morphology of the material was observed by scanning electron microscopy (SEM). Tests with various scan rates and pH conditions indicated an adsorption-controlled electrode process occurred. The mechanism of the electrode reaction of 4-NP involved a two-electron process accompanied by a deprotonation step. Electrochemical parameters were calculated with the electron transfer number (n) as 2.3, the effective area (0.6275 cm²) of CuNPs/PAA/GR/GCE electrode was 2.22 times as large as that of bare electrode, the adsorption capacity Г_s value was 1.6×10^-11 mol/cm², and the average value of the calculated k_cat value was 1.15×10⁴ L/(mol·s). Under the optimal conditions, the differential pulse voltammetric response of the electrode showed a linear relationship with 4-NP concentration in the range of 1-150 μmol/L. The regression equation was I_pa (μA)=-0.015C (μmol/L)-0.98 (R²=0.9951), and the detection limit was 0.23 μmol/L (S/N=3). The fabricated sensor exhibited high sensitivity, good stability and high reproducibility. This sensor was applied for detection of 4-NP in water samples with favorable recoveries of 88.6%-100.7% and relative standard deviation (RSD) of 2.6%-5.9%.
- Graphene,
- 4-Nitrophenol,
- Copper nanoparticles,
- Chronoamperometry,
- Chronocoulometry,
- Differential pulse voltammetry
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