Removal mechanism of benzene and chlorobenzene in water by modified biochar activates persulfate
GUO Ming-shuai1,2, WANG Fei2, ZHANG Xue-liang1, XU Jian1
1. Nanjing Institute of Environmental Sciences, Ministry of Ecological Environment, Nanjing 210042, China; 2. Institute of Geotechnical Engineering, School of Transportation, Southeast University, Nanjing 211189, China
Abstract：Iron salt-modified peanut shell biochar (Fe-BC) was synthesized by the traditional liquid-phase precipitation method and used as an activator for activating persulfate (PS) to promote the removal of benzene and chlorobenzene. The structure and morphology of the synthesized materials were characterized by scanning electron microscope, X-ray diffraction, Fourier transform infrared spectroscopy, Boehm titration (1994) and BET measurement. The effects of pH and anions in water on the reaction system and the re-use properties of the materials were also studied. The results demonstrated that in the Fe-BC/PS system, the removal rates of benzene and chlorobenzene were as high as 100% after 3hours. The synergistic mechanism of Fe-BC/PS to remove benzene and chlorobenzene included BC adsorption and free radical oxidation. In addition, under neutral and acidic environment, the removal rates of benzene and chlorobenzene can be as high as 100%. Common anions in water inhibited the degradation of benzene and chlorobenzene in various degrees, and the inhibition intensity was in the order of HCO3-> HPO4-> Cl-> NO3-. To sum up, Fe-BC material has good recycling performance and was an efficient and cheap PS activator.
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