磷酸改性颗粒污泥炭催化降解头孢氨苄  

Catalytic degradation of cephalexin with phosphoric acid modified-anaerobic granular sludge based biochar

作　　者：刘允康 赵颖[2] 侯作君 王国英[1] 安鸿翔[3] 卫皇曌[2] 余丽 LIU Yunkang;ZHAO Ying;HOU Zuojun;WANG Guoying;AN Hongxiang;WEI Huangzhao;YU Li(College of Environmental Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;China Institute for Radiation Protection,Taiyuan 030024,China)

机构地区：[1]太原理工大学环境科学与工程学院,太原030024 [2]中国科学院大连化学物理研究所,大连116023 [3]中国辐射防护研究院,太原030024

出　　处：《环境工程学报》2021年第5期1539-1548,共10页Chinese Journal of Environmental Engineering

基　　金：山西省应用基础研究计划(201901D211029);中国科学院青年创新促进会项目(2020190)。

摘　　要：以厌氧颗粒污泥为底物制备了颗粒污泥炭(GSC-O),通过对其进行磷酸改性,获得了较高催化活性和较好稳定性的磷酸改性颗粒污泥炭(GSC-P)。在催化湿式过氧化氢氧化体系中,分别考察了温度、pH、过氧化氢投加量、催化剂投加量、反应物初始浓度和反应时间等因素对头孢氨苄降解的影响。结果表明,GSC-P的催化性能远高于GSC-O。GSC-P催化降解头孢氨苄的最佳反应条件宜为:温度60℃、pH为3、过氧化氢投加量为1.0 g·L^(-1)、催化剂投加量为1.0 g·L^(-1)、反应物初始浓度为100 mg·L^(-1)和反应时间300 min,在此条件下头孢氨苄的转化率高达89.6%。此外,对GSC-P的稳定性进行了评价。在重复利用5次后,催化剂上的活性组分铁的溶出率仅为0.83%,头孢氨苄的转化率稳定在80%~88%。以上研究结果表明,以磷酸改性后的颗粒污泥炭的比表面积和孔容积增大、表面铁含量较多、官能团丰富,催化活性显著提升,且具有磁性,有利于回收利用。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.

关 键 词：厌氧颗粒污泥 污泥炭 头孢氨苄 催化湿式过氧化氢氧化 

分 类 号：X703[环境科学与工程—环境工程]