抗坏血酸对三价铁/过氧化钙体系降解头孢氨苄的影响  

Effect of ascorbic acid on the cefalexin degradation in Fe^(3+)/calcium peroxide system

作　　者：卢建 黄天寅[1] 徐劼 房聪[1] 陈家斌[1] LU Jian;HUANG Tianyin;XU Jie;FANG Cong;CHEN Jiabin(School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009

出　　处：《环境工程学报》2018年第10期2758-2767,共10页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51509175);苏州市民生科技项目(SS201666);江苏省研究生实践创新计划(SJCX17-0676)

摘　　要：通过添加抗坏血酸(AA)能够缓解铁离子形成沉淀和加速Fe^(3+)转化为Fe^(2+),催化CP产生活性氧物质(ROSs),对CFX降解起到促进作用。研究了Fe^(3+)/AA/CP体系降解CFX的Fe^(3+)浓度、AA浓度、CP浓度、初始pH等主要影响因素。结果表明:在Fe^(3+)浓度0.60 mmol·L^(-1)、AA浓度0.15 mmol·L^(-1)、CP浓度0.144 g·L^(-1)、CFX的初始浓度0.15 mmol·L^(-1)和初始pH=3.00的室温条件下,20 min内CFX的降解率可达到100%。随着初始pH升高,CFX的降解率随之降低。反应过程中降解CFX的活性物质为羟基自由基(HO·)和超氧自由基(O2-·),其中HO·对CFX降解起到主导作用。水中阴离子的影响表明,SO_4^(2-)、Cl^-对CFX的降解影响较小;但HCO3-对CFX的降解有明显的抑制作用。在处理成分较复杂的实际养殖废水实验中,发现只有提高药剂量才能达到有效降解实际废水中头孢氨苄的目的。The addition of ascorbic acid （AA） could alleviate the precipitation of dissolved iron and also accelerate the transformation of Fe^3＋ to Fe^2＋, which enhanced the generation of reactive oxygen species （ROSs） and thus promoted the degradation of CFX. In the Fe^3＋/AA/CP system, effects of various factors were explored, including the Fe^3＋dosage, contents of AA and CP, and initial pH. The results indicated that 100% degradation occurred for 0.15 mmol·L^-1CFX after 20 min treatment by Fe^3＋/AA/CP system at 0.60 mmol·L^-1 Fe^3＋, 0.15 mmol·L^-1 AA, 0.144 g·L^-1 CP and pH=3.00. The CFX degradation rate decreased with the increase of initial pH. Both of hydroxyl radicals （HO·） and superoxide radicals （O2-·） were determined to be responsible for CFX degradation, HO· plays a major role in the degradation of CFX. The anions of SO42-, Cl- had a slight impact on CFX degradation, while HCO3-significantly inhibited CFX degradation. When the Fe^3＋/AA/CP system was used to treat real swine wastewater with complex composition, the results indicated that the dosage increase for the reagents was required for the effective CFX degradation.

关 键 词：抗坏血酸 过氧化钙 头孢氨苄 活性氧物质 降解率 

分 类 号：X522[环境科学与工程—环境工程]