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《China Environmental Science》 2018-03
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Adsorption and catalytic hydrolysis of endosulfan on biochars derived from emergent plants

HE Qi;CAO Feng-mei;LU Shao-yong;CHEN Fang-xin;CAI Chun-lun;State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu,National Engineering Laboratory for Lake Pollution Control and Ecological Restoration,Chinese Research Academy of Environmental Sciences;  
Six kinds of biochars derived from typically wetland plants were pyrolyzed under 550℃ without oxygen,the adsorption and catalytic hydrolysis behavior of these biochars towards endosulfan were investigated.The results showed that the ash contents were higher than other agricultural wastes,rangeing from 10.88% to 31.11%.The results of characterization suggested that the biochars had a mass of aromatic domains and pores on the surface of biochars.The pores were mainly mesopores and partly fragmented.All the biochars have high adsorption capacity toward endosulfan.The adsorption was mainly occurred on the surface of biochars which contained dense organic matter.Hydrophobic,diffusion and distribution effects played significant role in the process of adsorption.Under the conditions of neutral or alkali solutions,CAI-B,ACC-B and THD-B could efficiently remove endosulfan with uptake rates of 96.77% to 98.57%.Moreover,biochar could catalyze the hydrolysis of endosulfan with an increase of hydrolysis efficiency about 16.57%~72.57% under the condition of neutral solution.
【Fund】: 典型湖泊有毒有害化学品和水环境调查(2015FY110900)
【CateGory Index】: X173;X592
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