正辛醇络合萃取对氯苯酚.pdf

第25卷第4期
化学研究
中国科技核心期刊
2014年7月
CHEMICAL RESEARCH
//hxya.chinajournal net cn
磷酸三丁酯/正辛醇络合萃取对氯苯酚
袁洋,李东风2,常志显2,张凌2,李德亮2
(1.新疆阿克苏职业技术学院,新疆阿克苏843000;2.河南大学化学化工学院环境与分析科学研究所,河南开封475004)
摘要:以对氯苯酚稀溶液为研究对象,以正辛醇为稀释剂,研究了萃取剂种类及其浓度、水相平衡pH、对氯苯
酚初始浓度等因素对萃取分配比的影响,并用NaOH对其负载溶质的有机相进行反萃,结果表明,络合萃取对
处理高浓度对氯苯酚废水具有优势;磷酸三丁酯(TBP)的浓度和体系的pH是影响络合萃取的关键因素;采用
NaOH对有机相进行反萃,当NaOH浓度为0.5mol/L时反萃率达到98.55%.红外光谱分析表明,TBP萃取对
氯苯酚基于氢键作用机理
关词:磷酸三丁酯;对氯苯酚;络合萃取
中图分类号:O658.2
文献标志码:A
文章编号:1008-1011(2014)04-0385-05
Extraction of p-chlorophenol by tributylphosphate/n-octanol
YUAN Yang, II Dongfeng, CHANG Zhixian, ZHANG Ling, LI Deliang
(1. College of Aksu Vocational and Technical, Aksu 843000, Xinjiang, China
2. Institute of Environmental and Analytical Sciences, College of Chemistry and Chemical Engineering
Henan University, Kaifeng 475004, Henan, China)
Abstract: The distribution coefficient of reactive extraction of b-chlorophenol from aqueous so
lution was studied using tributylphosphate as extractant and n-octanol as diluent. The effects of
the extractant and its concentration, equilibrium PH, and the initial concentration of p-chloro
phenol were discussed. With NAOH as stripping agent, the back extraction was also investiga
ted. Results indicate that reactive extraction has great advantage to the treatment of high con-
centration 2-chlorophenol-containing wastewater. The concentration of tributylphosphate and
the equilibrium PH are the key factors that affect extraction equilibrium. The back extraction
ratio could reach 98.55% with 0.5 mol/L of NAOH. M
the h
d
nydrogen-bond 11
teraction
between TBP and -chlorophenol is validated based on infrared spectrotric analysis.
Keywords: tributylphosphate; p-chlorophenol; reactive extraction
对氯苯酚(简称4-CP)是一种常见的酚类有机化合物,是合成染料、医药、农药、塑料的重要原料,它广泛
存在于多类废水中,其污水在环境中具有一定的稳定性,通过迁移,易在食物链中积累?,对环境产生极大的
潜在危害.因此,对其废水的处理一直是人们关注的研究课题.研究者先后采取吸附法2-、高级氧化
法「-]、生化法-1及联合法等处理对氯苯的废水.吸附法设备简单、操作方便、净化效率高、吸附量大、吸
附选择性高等,但只适用于低浓度废水,且吸附剂再生比较困难.在高级氧化法中,光催化氧化具有高效、反
应迅速、降解彻底的优势,但处理成本较高,限制了其在工业上的广泛应用;化学氧化法没有二次污染,工艺
收稿日期:2014
甚金项目:河南省基础与前沿项目(1323004110237)和河南省国际科技合作项目(134300510030)
作者简介:袁洋(1960一),女,副教授,主要研究方向为环境化学,通讯联系人,E-mail:lideliangl@henu.edu.cn.