文章摘要
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,2014,33(6):1131-1138.
BS-CTMAB复配修饰膨润土对苯酚的吸附
Adsorption of Phenol on Amphoteric-Cationic Modified Bentonites
  
DOI:10.11654/jaes.2014.06.012
中文关键词: 复配修饰  苯酚  两性-阳离子表面修饰剂  膨润土  吸附
英文关键词: combined modification  phenol  amphoteric-cationic modifier  bentonite  adsorption
基金项目:
作者单位
李 彬 西北农林科技大学理学院 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 
王建涛 西北农林科技大学资源环境学院 陕西 杨凌 712100 
马麟莉 西北农林科技大学资源环境学院 陕西 杨凌 712100 
许绍娥 西北农林科技大学资源环境学院 陕西 杨凌 712100 
杨淑英 西北农林科技大学理学院 陕西 杨凌 712100 
摘要点击次数: 2268
全文下载次数: 2302
中文摘要:
      采用两性表面修饰剂十二烷基二甲基甜菜碱(BS-12)和阳离子表面修饰剂十六烷基三甲基溴化铵(CTMAB)复配修饰膨润土,通过批处理法研究了不同修饰比例、温度、pH和离子强度等条件下,复配修饰膨润土对苯酚的吸附规律和热力学特征,并探讨了其吸附机制。结果表明,CTMAB复配修饰显著增强了两性修饰膨润土对苯酚的吸附能力,30 ℃时吸附量呈现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(原土)的顺序。当CTMAB复配修饰比例在0~100%CEC时,两性复配修饰土样对苯酚的吸附量随着修饰比例的增大而升高,而在100%~150% CEC阶段,吸附量则随CTMAB修饰比例的增大有所降低;修饰土样对苯酚吸附量随着温度、pH的升高而降低,在低浓度范围内,随着离子强度的增大而升高。Henry模型适用于描述苯酚在供试土样的吸附,供试土样对苯酚的吸附属于自发的物理吸附过程,吸附呈现焓减、熵增特征。
英文摘要:
      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 phenol isotherms. The adsorption of phenol on amphoteric-cationic modified bentonites is a spontaneous physical adsorption process characteristized by both enthalpy decreases and entropy increases.
HTML    查看全文   查看/发表评论  下载PDF阅读器