Citation: CHEN Su-Qing, SHEN Mao, LIANG Hua-Ding, BAO Ming-Hui. Synthesis and Characterization of Magnetic Graphene Oxide Nanocomposites Supported Silver Matrix and Its Adsorption Property for 2,4-Dichlorophenol[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(7): 912-920. doi: 10.19756/j.issn.0253-3820.191723 shu

Synthesis and Characterization of Magnetic Graphene Oxide Nanocomposites Supported Silver Matrix and Its Adsorption Property for 2,4-Dichlorophenol

School of Pharmaceutical and Materials Engineering, Taizhou University, Taizhou 318000, China

Received Date: 6 December 2019
Revised Date: 21 April 2020

Fund Project: This work was supported by the Zhejiang Provincial Natural Science Foundation (No. LTY20B050001) and the Zhejiang Provincial Public Welfare Technology Research Project, China (No. LGC19B050006).

Magnetic nanocomposites Ag/AgCl@Fe₃O₄@GO were synthesized by solvothermal process. The structure and morphology of the products were characterized by transmission electron microscopy, scanning transmission electron microscopy, energy dispersive X-ray spectroscopy and nitrogen adsorption and desorption method. The adsorption properties of the materials for 2,4-dichlorophenol (2,4-DCP) in aqueous solution were studied. The results indicated that the nanocomposites were composed of Ag/AgCl@Fe₃O₄ spherical magnetic nanoparticles with mesoporous structure loaded on the folded surface of graphene oxide. The average pore size of the product was 13.98 nm, and the specific surface area and pore volume were 46.91 m²/g and 0.1791 cm³/g, respectively. The adsorption experiment of 2,4-DCP on Ag/AgCl@Fe₃O₄@GO composite showed that for 20 mg/L of 2,4-DCP solution, the adsorption equilibrium was basically reached in 20 min, and the adsorption capacity was 13.74 mg/g. The adsorption fitted well with pseudo second-order kinetic model, and the correlation coefficient was 0.99954. The Langmuir model was more suitable for describing the adsorption with the correlation coefficient range of 0.9841-0.9972, which showed that the adsorption was a monolayer adsorption. Adsorption thermodynamic parameters ΔG were -5.0462 kJ/mol (293 K), -4.4076 kJ/mol (303 K), -3.7522 kJ/mol (313 K), -3.4358 kJ/mol (323 K), ΔH and ΔS were -17.1653 kJ/mol and -42.2158 J/(mol·K), respectively. The adsorption process was a spontaneous exothermic process with entropy decreasing. In addition, the temperature was lower and the adsorption was better, which showed the characteristics of physical adsorption. This kind of functional composite not only had good adsorption activity, but also could be recycled by the way of external magnetic field.
- 2,4-Dichlorophenol,
- Graphene oxide,
- Magnetic nanocomposites,
- Pore structure,
- Adsorption properties
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