四氧化三铁负载纳米零价铁类Fenton法去除水中对氯苯酚  

Removal of p Chlorophenol from Water by Fe_(3)O_(4)-nZVI Fenton-Like Method

作　　者：郑博文 钟金魁[1,2] 谢欣卓 李静 ZHENG Bo-wen;ZHONG Jin-kui;XIE Xin-zhuo;LI Jing(School of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Key Laboratory of Yellow River Water Environment in Gansu Province,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070 [2]兰州交通大学甘肃省黄河水环境重点实验室,兰州730070

出　　处：《兰州交通大学学报》2022年第4期103-110,共8页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(22166022);甘肃省科技计划项目(20JR2RA002)。

摘　　要：首先用共沉淀法和液相还原法制成Fe_(3)O_(4)负载纳米零价铁(nZVI)复合材料(Fe_(3)O_(4)-nZVI),并利用扫描电镜(SEM)、X射线能谱分析(EDS)及振动样品磁强计(VSM)对Fe_(3)O_(4)-nZVI的形貌和磁性特征进行了表征,然后将Fe_(3)O_(4)-nZVI用作催化剂,与H_(2)O_(2)耦合构建类Fenton体系用于去除废水中的对氯苯酚(4-CP).重点考察了溶液pH、反应温度、4-CP初始浓度、Fe_(3)O_(4)-nZVI投加量、nFe^(0)∶nFe_(3)O_(4)、H_(2)O_(2)浓度、离子强度等因素对4-CP去除效果的影响.结果表明,Fe_(3)O_(4)-nZVI为纳米级磁性复合材料,其饱和磁化强度为105.52emu/g.当nFe^(0)∶nFe_(3)O_(4)为1∶1时,降低反应体系pH值,提高H_(2)O_(2)浓度和反应温度,增加Fe_(3)O_(4)-nZVI投加量,减少污染物浓度均可提高Fe_(3)O_(4)-nZVI类Fenton体系对4-CP的去除率.然而,当反应体系pH<2或碱性,H_(2)O_(2)的浓度<5mmol/L或>15mmol/L,都不利于废水中4-CP的去除.在25℃,pH=3,4-CP初始浓度为40mg/L,Fe_(3)O_(4)-nZVI投加量为0.6g/L,H_(2)O_(2)为10mmol/L等优化条件下,Fe_(3)O_(4)-nZVI类Fenton体系对4-CP的去除率达97.24%.同时,离子强度也是一个重要的影响因素,随着离子(如,Ca^(2+)和Mg^(2+))强度的增加,Fe_(3)O_(4)-nZVI类Fenton体系对4-CP的去除率逐渐减小.由上可知,Fe_(3)O_(4)-nZVI类Fenton法可有效去除水中4-CP及其它氯酚污染物.Fe_(3)O_(4)loaded nano-zero-valent iron(Fe_(3)O_(4)-nZVI)was prepared firstly by coprecipitation method and liquid phase reduction method,and characterizedthrough scanning electron microscope(SEM),energy dispersive spectroscopy(EDS)and vibrating sample magnetometer(VSM).Then,the obtained material Fe_(3)O_(4)-nZVI was used as catalyst in Fenton-like method to remove p-chlorophenol(4-CP)from wastewater.The effects of many factors,such as the pH of solution,the temperature of reaction system,the initial concentration of 4-CP,the dosage of Fe_(3)O_(4)-nZVI,nFe^(0):nFe_(3)O_(4),the concentration of H_(2)O_(2),andionicstrength,on the removal efficiency of 4-CP were studied.The results showed that when the molar ratio of Fe_(3)O_(4) to nZVI was 1:1,the removal efficiency of 4-CP increased with decreasing the pH value of the solution and the initial concentration of 4 CP,and increased with increasing the concentration of H_(2)O_(2),the temperature of reaction system and the amount of Fe_(3)O_(4)-nZVI.However,under the conditions of pH<2 or alkalinity,and H_(2)O_(2) concentration<5 mmol/L,or>15 mmol/L,the Fe_(3)O_(4) nZVI Fenton-ike system was detrimental to the removal of 4 CP.Under the optimized conditions of 25℃,nFe^(0):nFe_(3)O_(4)=1:1,pH=3,10 mmol/L of H_(2)O_(2),40 mg/Lof4-CP,0.6 g/L of Fe_(3)O_(4)-nZVI,the removal efficiency of 4-CP by Fe_(3)O_(4)-nZVI Fenton-like system could reach 97.24%.At the same time,ionic strength was a key influen-cing factor on the removal of 4-CP,which gradually decreased with the increasing ionic strength of Ca and Mg^(2+).Mentioned as above,Fe_(3)O_(4)-nZVI Fenton-like technology might be considered as a potential method for treating wastewater containing 4-CP and others chlorophenol compounds.

关 键 词：四氧化三铁 纳米零价铁 类Fenton法 对氯苯酚 

分 类 号：X703[环境科学与工程—环境工程]