两性修饰磁性膨润土的表征及其对苯酚的吸附

任爽; 孟昭福; 刘伟; 李文斌; 邓晶

文章摘要

任爽,孟昭福,刘伟,李文斌,邓晶.两性修饰磁性膨润土的表征及其对苯酚的吸附[J].农业环境科学学报,2017,36(1):108-115.

两性修饰磁性膨润土的表征及其对苯酚的吸附

Characterization and adsorption performance of phenol on amphoteric modified magnetic bentonites

投稿时间：2016-08-15

DOI：10.11654/jaes.2016-1057

中文关键词: 磁性膨润土两性表面活性剂苯酚吸附

英文关键词: magnetic bentonite amphoteric surfactant phenol adsorption

基金项目:国家自然科学基金项目（41271244）

作者	单位	E-mail
任爽	西北农林科技大学资源环境学院, 陕西杨凌 712100
孟昭福	西北农林科技大学资源环境学院, 陕西杨凌 712100 农业部西北植物营养与农业环境重点实验室, 陕西杨凌 712100	zfmeng1996@263.net
刘伟	西北农林科技大学资源环境学院, 陕西杨凌 712100
李文斌	西北农林科技大学资源环境学院, 陕西杨凌 712100
邓晶	西北农林科技大学图书馆, 陕西杨凌 712100

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中文摘要:

采用共沉淀负载Fe₃O₄法制备了磁性膨润土，并以两性修饰剂十二烷基二甲基甜菜碱（BS-12）对其进行两性有机修饰，在对样品进行分析表征的基础上，采用批处理法研究了BS-12修饰磁性膨润土对苯酚的吸附特征。结果表明，磁性膨润土及两性修饰磁性膨润土磁性良好并利于回收；膨润土负载Fe₃O₄后比表面积增加，两性修饰磁性膨润土的比表面积和孔容随BS-12修饰比例的增大而减小，粒径随修饰比例的增大而增大；BS-12修饰增大了磁性膨润土的C、N含量，在磁性膨润土上形成有机相。两性修饰磁性膨润土对苯酚的吸附量，随BS-12修饰比例和离子强度的增大而增加，随pH和温度的升高而减少。Henry模型适用于描述两性修饰磁性膨润土对苯酚的吸附，吸附以分配机制为主。

英文摘要:

In order to solve the problem of bentonite separation from wastewater and to improve adsorption capacity of bentonite on organic pollutants. After prepared magnetic bentonite by the co-precipitation method and then modified by amphoteric surfactant dodecyl dimethyl betaine(BS-12), the study on surface characteristics of amphoteric modified magnetic bentonite(AMMB), such as scanning electron microscopy(SEM), X-ray diffraction(XRD), Fourier transform infrared(FT-IR) etc., and its adsorption ability to phenol under different modification proportions, pH, temperature and ionic strength were carried out. The results showed that magnetic bentonite had higher magnetism and greater surface area than bentonite. With an increase of BS-12 modification proportion, C and N contents and particle size of AMMB increases, but the specific surface area and pore volume decreases. The adsorption amounts of 50BS-MBT, 100BS-MBT and 150BS-MBT were 4.76, 7.78 and 12.04 times higher than that of MBT, respectively. Phenol adsorption on AMMB depends mainly on partition effect due to its linear adsorption isotherm, the adsorption ability increased as temperature and pH dropped, but increased as ionic strength increased. Henry Equation was the optimal description for phenol's adsorption isotherms. The studies demonstrated that the AMMB had high adsorption capacity and can be removed easily compared with raw bentonite.

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