Catalytic degradation of cephalexin with phosphoric acid modified-anaerobic granular sludge based biochar
LIU Yunkang1,, ZHAO Ying2, HOU Zuojun2, WANG Guoying1, AN Hongxiang3, WEI Huangzhao2, YU Li1,3,, 1.College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2.Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 3.China Institute for Radiation Protection, Taiyuan 030024, China
Abstract:In this study, anaerobic granular sludge was used to prepare the granular sludge based biochar of GSC-O, after phosphoric acid modification, GSC-P with high catalytic activity and stability was produced. In the catalytic wet peroxide oxidation system, the effects of temperature, pH, dosage of hydrogen peroxide and catalyst, the initiate reactant concentrations and reaction time on the degradation of cephalexin were investigated. The result showed that catalytic ability of GSC-P was much higher than GSC-O. The optimal reaction conditions for catalytic degradation of cephalexin with GSC-P were 60 ℃, pH=3, hydrogen peroxide dosage of 1.0 g·L?1, catalyst dosage of 1.0 g·L?1, the initial reactant concentration of 100 mg·L?1 and the reaction time of 300 min. Under these conditions, the conversion of cephalexin was as high as 89.6%. In addition, the stability of GSC-P was evaluated. After five-cycle use of GSC-P, only 0.83% of activated iron in the catalyst was leaching out. Cephalexin conversion maintained at 80%~88%. The result showed that phosphoric acid modification improved the specific surface area and pore volume of granular sludge carbon, the iron content and functional groups on the surface of GSC-P, as well as the catalytic activity. Besides, GSC-P possessed magnetic property which was beneficial for its recovery. Key words:anaerobic granular sludge/ sludge based biochar/ cephalexin/ catalytic wet peroxide oxidation.
图1颗粒污泥炭GSC-O和GSC-P的XRD谱图和磁滞回线 Figure1.XRD patterns and Hysteresis loops of GSC-O and GSC-P
图4温度、pH、H2O2、催化剂投加量和污染物浓度对头孢氨苄转化率和TOC去除率的影响 Figure4.Effects of temperature, pH, the dosage of H2O2 and catalyst and pollutant concentration on cephalexin conversion and TOC removal
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1.College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China 2.Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China 3.China Institute for Radiation Protection, Taiyuan 030024, China Received Date: 2020-11-05 Accepted Date: 2021-03-12 Available Online: 2021-05-23 Keywords:anaerobic granular sludge/ sludge based biochar/ cephalexin/ catalytic wet peroxide oxidation Abstract:In this study, anaerobic granular sludge was used to prepare the granular sludge based biochar of GSC-O, after phosphoric acid modification, GSC-P with high catalytic activity and stability was produced. In the catalytic wet peroxide oxidation system, the effects of temperature, pH, dosage of hydrogen peroxide and catalyst, the initiate reactant concentrations and reaction time on the degradation of cephalexin were investigated. The result showed that catalytic ability of GSC-P was much higher than GSC-O. The optimal reaction conditions for catalytic degradation of cephalexin with GSC-P were 60 ℃, pH=3, hydrogen peroxide dosage of 1.0 g·L?1, catalyst dosage of 1.0 g·L?1, the initial reactant concentration of 100 mg·L?1 and the reaction time of 300 min. Under these conditions, the conversion of cephalexin was as high as 89.6%. In addition, the stability of GSC-P was evaluated. After five-cycle use of GSC-P, only 0.83% of activated iron in the catalyst was leaching out. Cephalexin conversion maintained at 80%~88%. The result showed that phosphoric acid modification improved the specific surface area and pore volume of granular sludge carbon, the iron content and functional groups on the surface of GSC-P, as well as the catalytic activity. Besides, GSC-P possessed magnetic property which was beneficial for its recovery.
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