污泥生物炭活化过一硫酸盐降解环丙沙星  

Degradation of Ciprofloxacin by Activating Peroxymonosulfate with Sludge Biochar

作　　者：郑大洋 邹佳丽 徐皓 王滕 石宇翔 陈永健 李彬阳 王亚宜[1] 冯沧[1] 吴敏[1] ZHENG Da-yang;ZOU Jia-li;XU Hao;WANG Teng;SHI Yu-xiang;CHEN Yong-jian;LI Bin-yang;WANG Ya-yi;FENG Cang;WU Min(State Key Laboratory of Pollution Control and Resources Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境科学》2023年第12期6801-6810,共10页Environmental Science

基　　金：国家重点研发计划项目(2021YFC3200604);国家自然科学基金项目(51778447)。

摘　　要：以脱水干化污泥为原料,经450℃热解制成污泥生物炭(BC),活化过一硫酸盐(PMS),构建BC/PMS体系,降解环丙沙星(CIP).采用扫描电子显微镜(SEM)、X射线能谱(EDS)、傅里叶变换红外吸收光谱(FTIR)、X射线衍射(XRD)、Zeta电位分析仪和电子自旋共振(EPR)分析了BC的理化性质;考察了BC投加量、PMS投加量、初始pH值和无机阴离子对BC/PMS体系降解CIP效果的影响;通过自由基淬灭实验和X射线光电子能谱(XPS)分析,深入探讨了BC/PMS体系对CIP降解机制.结果表明,CIP降解率随BC投加量和PMS投加量增大而升高,随溶液初始pH增大而降低,在BC 1.0 g·L^(-1)、PMS 3.0 mmol·L^(-1)、初始pH 6.0、CIP 20 mg·L^(-1)和反应时间120 min时,CIP降解率为49.09%;SOSO_(4)^(-)和NO_(3)^(-)对BC/PMS体系降解效果无显著影响,HCO_(3)^(-)和Cl^(-)具有明显抑制作用;BC/PMS体系降解CIP是自由基途径(·OH和SO_(4)^(-)·)和非自由基途径(^(1)O_(2))共同作用的结果,降解路径主要包括哌嗪环开环和羟基化反应.Sludge biochar(BC),which was prepared by the pyrolysis of waste-activated sludge at 450℃,was applied for peroxymonosulfate(PMS)activation to construct a BC/PMS system for ciprofloxacin(CIP)degradation.The physical and chemical properties of BC were studied using scanning electron microscopy(SEM),an energy dispersive spectrometer(EDS),a Fourier transform infrared spectrometer(FTIR),X-ray diffraction(XRD),a Zeta potential analyzer,and electron paramagnetic resonance spectroscopy(EPR).The effects of BC dosage,PMS dosage,initial pH value,and inorganic anions on CIP removal in the BC/PMS system were investigated.Further,the degradation mechanism of the BC/PMS system was speculated through the free radical quenching experiment and X-ray photoelectron spectroscopy(XPS)analysis.The results showed that the CIP degradation rate was 49.09% at a BC dosage of 1.0 g·L^(-1),PMS of 3.0 mmol·L^(-1),CIP of 20 mg·L^(-1),and pH of 6.0 in 120 min.SO_(4)^(2-)and NO_(3)^(-)had no obvious effect on the removal of CIP in the BC/PMS system,whereas HCO_(3)^(-)and Cl^(-)could inhibit CIP degradation significantly.The CIP removal in the BC/PMS system was attributed to the common function of the radical pathway dominated by·OH and SO_(4)^(-)·and the non-radical pathway dominated by _(1)O_(2).The CIP degradation pathway mainly included piperazine ring opening and hydroxylation reaction.

关 键 词：过一硫酸盐 污泥生物炭 环丙沙星 自由基 非自由基 

分 类 号：X131.2[环境科学与工程—环境科学]