有机凹凸棒土对二氯苯酚的吸附研究.pdf

第24卷第6期
化学研究与应用
Vol. 24. No6
2012年6月
Chemical Research and Application
Jun.,2012
文章编号:1004-1656(2012)06-0854-06
有机回凸棒土对二氯苯酚的吸附研究
孙玉凤,刘总堂,费正皓',王京平,施卫忠
(江苏省滩涂生物资源与环境保护重点建设实验室,盐城师范学院,江苏盐城224002)
摘要:本研究采用超声法用十六烷基三甲基溴化铵改性凹凸棒土制得了有机回凸棒土( HDTMA-凹凸棒土),
并采用XRD和FT-IR对其结构进行了表征。通过吸附实验研究了 HDTMA-凹凸棒土对水溶液中二氯苯酚的
吸附性能和吸附机理。结果表明:经有机改性后, HDTMA'成功进人到凹凸棒土的层间, HDTMA-凹凸棒土对
氯苯酚的吸附量比未改性四凸棒土增大了近20倍。 Freundlich方程能够较好的描述吸附等温线。二氯苯
酚在 HDMMA-四凸棒土上主要是焓推动为主的物理吸附过程,且吸附过程放热。
关键词:凹凸棒土;有机改性;二氯萃酚;吸附
中昭分类号:X131.文献标识码:A
Study of dichlorophenol adsorption by organic attapulgite
SUN Yu-feng, LIU Zong-tang, FEI Zheng-hao
WANG Jing-ping, SHI Wei-zhong
( Jiangsu Provincial Key Iaboratory of Coastal Wetland Bioresources and Environmental Protection
Yancheng Teachers University, Yancheng 224002, China)
Abstract Attapulgite was modified with the su actant of hexadecyltrimethyl-ammonium bromide(hdtma-br)by ultrasonic to ob-
tain the or a c-m ed HDTM a l i e The HDTMA apul e was characterized by XRD and FT-IR. The adsorption capac-
ity and mechanism of dichlorophenols absorbed onto HDTMA-AT augie had been studied. The analysis indicated that HDTMA
were intercalated on the interlayered of attapulgite. The adsoption capacties of ichoropen on Hdtma-aapulgte were about
20 times higher than tat on natural attapulgite. Freundlich isotherm equation models could describe the adsorption data perfect.
ly. The adsorption process of dichlorophenols on o Hdtma-attapulgite was physical adsorption which was mainly promoted by en
thalpy and it was exothermic
Key words: attapu] gite; organic surface modification; dichlorophenol adsorption
二氯苯酚广泛应用于合成染料、医药和农药被认为是最好的从水中吸附有毒有害的有机物质
等,也是土壤和地下水中常见的有机污染物。其的可行性技术。常用的吸附剂主要有活性炭、
具有毒性和致畸致癌作用,属于难生物降解有机改性纤维素、硅胶等,但由于其再生困难,吸附
物,会在环境中积累,造成严重的污染问题,对人体健的物质难以实现资源化,运行成本高,严重制约了
康产生极大的危害?,在我国和欧美等国的饮用水其在工业上的推广应用。凹凸棒土( attapulgite)是
水质标准中已都被列为优先控制污染物劉。吸附法一种具有独特层链状结构的一维棒状纳米硅酸盐
收稿日期:2011-09-16修回日期:2011-11-11
金项目:江苏省滩涂生物资源与环境保护重点建设实验室开放课题项目(JCBD8003)资助;国家自然科学基金项目(21077087)资助
联系人简介:费正皓(1972-),男,教投,主要研究方向:水处理技术研究。E-mail:feizhenghaod@163.com