Preparation of Nano-Fe3O4/Saponite Composites and Removal Performance of 2,4-Dichlorophenol

Abstract

Abstract: In this study, the nano-Fe₃O₄/saponite composites were prepared by hydrothermal synthesis and coprecipitation method, and used to remove 2,4-dichlorophenol (2,4-DCP) from water. The phase composition, structure, morphology and elemental composition of nano-Fe₃O₄/saponite composites were characterized by X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray fluorescence (XRF). The removal efficiency of 2,4-DCP by nano-Fe₃O₄/saponite composites under solution with different 2,4-DCP concentration, reaction time and pH were investigated. The results show that the in-situ growth of nano-Fe₃O₄ on the surface of saponite is more evenly dispersed, which effectively reduces the agglomeration of Fe₃O₄. The maximum removal of 2,4-DCP by nano-Fe₃O₄/saponite composites is 178.46 mg/g when the pH value is 6, and the removal of 2,4-DCP reaches saturation when the reaction time is 5 min. The removal kinetics of 2,4-DCP by nano-Fe₃O₄/saponite composites accords with the pseudo-second-order kinetic model. On this basis, liquid chromatography-mass spectrometry (LC-MS) analysis shows that 2,4-DCP is degraded into chlorophenol and other intermediate products. The research results provide a new, environmentally-friendly and efficient environmental functional material for the degradation of organic pollutants in water.

Key words: nano-Fe₃O₄, saponite, composite, adsorption-degradation, 2,4-dichlorophenol, water pollution

CLC Number:

X751

WU Limei, LIU Yan, WANG Xiaolong, TANG Ning, WANG Qing. Preparation of Nano-Fe₃O₄/Saponite Composites and Removal Performance of 2,4-Dichlorophenol[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1821-1829.

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Preparation of Nano-Fe₃O₄/Saponite Composites and Removal Performance of 2,4-Dichlorophenol

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