摘要
分析了CaO 2在紫外光(UV)催化活化下对诺氟沙星(NFX)的降解特性,考察了反应体系、CaO2投加量、初始pH、水体基质(Cl-、NO3-、HCO3-)对降解特性的影响,通过抑制剂的加入探索了UV/CaO2体系的作用机制。结果表明,在溶液初始pH=6,CaO2=1 g/L的条件下,NFX在3 h内的去除率可达96.7%,但当pH升至8时,NFX的去除率降至60%。水体基质中Cl-对NFX的降解起促进作用,HCO3-对NFX的降解无显著影响,NO3-对NFX的降解具有抑制作用;UV/CaO2体系中,对NFX降解起主要作用的活性物质为·OH。相比较传统芬顿反应pH=3的作用条件,UV/CaO2可在pH=6条件下反应并在近中性条件下有效去除污染物。
The performance of norfloxacin(NFX)degradation by ultraviolet(UV)activated CaO 2 were analyzed.The effects of reaction system,CaO 2 dosage,initial pH and water matrix(Cl-,NO 3-,HCO 3-)on NFX degradation were investigated.The mechanism of UV/CaO 2 system were studied by adding inhibitor.Experimental results showed that 96.7%NFX was removed in 3 h with 1 g/L CaO 2 dosage at initial pH 6.When the pH increased to 8,the removal of NFX decreased to 60%.The degradation of NFX was promoted by Cl-,inhibited by NO 3-and not affected by HCO 3-.·OH was identified as the major reactive substance.Compared with the traditional Fenton reaction(pH=3),UV/CaO 2 could degrade contaminants effectively at circumneutral pH(pH=6).
作者
李前
钱雅洁
刘振鸿
薛罡
李珂
LI Qian;QIAN Yajie;LIU Zhenhong;XUE Gang;LI Ke(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China)
出处
《能源环境保护》
2019年第6期9-13,17,共6页
Energy Environmental Protection
基金
国家自然科学基金(No.51708097
51878135)
关键词
CAO2
NFX
降解机制
近中性
CaO 2
Norfloxacin
Degradation mechanism
Circumneutral pH
