摘要
硝基苯在自然界中难以被生物降解,对生态和环境造成了严重的危害。采用萃取法处理硝基苯废水既可降低废水的危害,又可实现部分硝基苯回收。以环己烷和脂肪酸甲酯为萃取剂,考察了萃取时间、温度、pH值、相比[V(萃取剂)∶V(废水)]对硝基苯去除率的影响。结果表明:环己烷作为萃取剂时,硝基苯去除率要优于脂肪酸甲酯,在萃取时间20 min、温度35℃、相比1∶1、pH=6.4时,硝基苯去除率为97%。在此条件下进行三级错流萃取后,硝基苯浓度降至1.77 mg/L。同时,考察了环己烷的循环使用次数对萃取效率的影响。结果表明:环己烷循环使用30次后,萃取效率依然达到92.11%,说明环己烷再生后可以循环利用。
Nitrobenzene （NB） is difficult to be readily biodegradation, which can pose gloat hazard to the ecology and the environment. Applying extraction methods for NB wastewater can not only reduce environmental hazards, but also recycle NB. Effects of extraction time, temperature, pH, and phase ratio （Vextractant：wastewater） on the NB removal rate with cyclohexane and fatty acid methyl ester as extractant were investigated. The results show that NB removal rate can reach 97% with cyclohexane as extractant under the following reaction conditions： extraction time of 20 rain, pH of 6.4, temperature of 35 ℃, phase ratio of 1 ： 1, which is better than fatty acid methyl ester. After the thine-stage cross flow of wastewater is treated, the concentration of NB can decrease to 1.77 mg/L. Meanwhile, the extraction efficiency can reach 92.11% when the cyclohexane is used for 30 times, which indicate cyclohexane can be recycled after regeneration.
作者
杨鹏飞
焦纬洲
刘有智
刘瑛
YANG Peng-fei;JIAO Wei-zhou;LIU You-zhi;LIU Ying(Shanxi Province Key Laboratocy of Super-Gravity Chemical Engineering,North University of China;Research Center of Shanxi Province for High Gravity Chemical Engineering and Technology,Taiyuan 030051,Shanxi Province,China)
出处
《化学工程》
CAS
CSCD
北大核心
2018年第5期1-5,共5页
Chemical Engineering(China)
基金
国家自然科学基金资助项目(U1610106)
山西省优秀人才科技创新项目(201705D211011)
山西省三晋学者支持计划专项经费资助(201707)
中北大学杰出青年基金支持计划资助项目(201701)
关键词
硝基苯废水
液液萃取
环己烷
脂肪酸甲酯
nitrobenzene wastewater
liquid-liquid extraction
cyclohexane
fatty acid methyl ester
