农业环境科学学报Issue(6)：1131-1138,8.DOI:10.11654/jaes.2014.06.012
BS-CTMAB复配修饰膨润土对苯酚的吸附
Adsorption of Phenol on Amphoteric-Cationic Modified Bentonites
摘要
Abstract
Modified bentonites have been used as an adsorbent for environmental remediation. An experiment was designed to examine the adsorption of phenol on bentonites modified by a mixture of amphoteric modifier, dodecyl dimethyl betaine(BS-12), and cationic modifier, hexadecyltrimethylammonium bromide(CTMAB)as influenced by modifier ratios, ionic strength, temperature and pH. Adsorption capacity of phenol on bentonites was in order of 100BS+100CT(100%BS-12+100%CTMAB)>100BS+50CT(100%BS-12+50%CTMAB)>50BS+100CT(50%BS-12+100%CTMAB)>100BS+150CT(100%BS-12+150%CTMAB)>50BS+50CT(50%BS-12+50%CTMAB)>100BS+25CT (100%BS-12+25%CTMAB)>50BS+150CT(50%BS-12+150%CTMAB)>50BS+25CT(50%BS-12+25%CTMAB)>100BS(100%BS-12)>50BS(50%BS-12)>CK(unmodified soil). This revealed that the adsorption of phenol on modified bentonites increased with increasing CTMAB ratios at 0~100%of CEC, while decreased slightly at CTMAB ratios greater than 100%of CEC. The phenol adsorption was reduced by elevated temperature and pH, but increased with ionic strength at low concentration ranges. Henry equation could best describe the phe-nol isotherms. The adsorption of phenol on amphoteric-cationic modified bentonites is a spontaneous physical adsorption process character-istized by both enthalpy decreases and entropy increases.关键词
复配修饰/苯酚/两性-阳离子表面修饰剂/膨润土/吸附Key words
combined modification/phenol/amphoteric-cationic modifier/bentonite/adsorption分类
资源环境引用本文复制引用
李彬,孟昭福,王建涛,马麟莉,许绍娥,杨淑英..BS-CTMAB复配修饰膨润土对苯酚的吸附[J].农业环境科学学报,2014,(6):1131-1138,8.基金项目
国家自然科学基金项目（41271244）；陕西省社会发展攻关项目（2013K13-01-05）；陕西省农业科技攻关项目 （）
