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.
作者
卢建
黄天寅
徐劼
房聪
陈家斌
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)
出处
《环境工程学报》
CAS
CSCD
北大核心
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)
关键词
抗坏血酸
过氧化钙
头孢氨苄
活性氧物质
降解率
ascorbic acid
calcium peroxide
cefalexin
reactive oxygen species
degradation rate
