摘要
用液相非稳态共沉淀法制备了Mg-Al类水滑石(HTlc);Mg-Al HTlc于450℃下焙烧得焙烧类水滑石(CHTlc);采用结构重建法由CHTlc制备了十二烷基硫酸根(DS-)插层(改性)类水滑石(DS HTlc).研究了邻甲酚在Mg-Al HTlc,CHTlc和DS HTlc上的吸附行为:邻甲酚在Mg-Al HTlc,CHTlc和DS HTlc上的吸附动力学和等温式均分别符合准二级动力学方程和Freundlich方程,且吸附速率和吸附量大小均依次为:DS HTlc>>CHTlc>HTlc;在初始pH=5.00～13.00范围内,邻甲酚在HTlc和CHTlc上的吸附量随pH值的增加先增加后减小,随温度的增加而增加,邻甲酚在DS HTlc的吸附量随pH值和温度的增加而降低;邻甲酚在HTlc,CHTlc和DS HTlc上的吸附量均随电解质(NaCl)浓度的增加而增加,探讨了吸附机理.研究结果表明,DS HTlc有望成为一种新型的高效酚类有机污染物处理剂.
MgAI hydrotalcitelike compound （HTlc）, calcined HTlc （CHTlc） and dodecylsulfate anion- intercalated Mg-A1 HTlc （DSoHTlc） were prepared. The sorption behavior of ocresol on the HTIc, CHTlc and DS·HTlc was investigated. The sorption kinetics and sorption isotherms of ocresol on the HTlc, CHTlc and DS·HTIc can all be well fitted with the pseudosecond order kinetic and Freundlich equation, respec tively. The results indicated that the sorption rate and sorption amount of ocresol on the DSoHTIc is much higher than that on the CHTlc, which is little higher than that on the HTlc. The sorption amount of ocresol on the HTIc and CHTlc increased firstly and then decreased with increasing pH in the initial pH range of 5.00-13.00 and increased with increasing temperature. The sorption amount of ocresol on the DSoHTIc decreased gradually with increasing initial pH and temperature. The sorption amount of ocresol on the HTlc, CHTlc and DS^HTIc increased with the increasing electrolyte （NaC1） concentration. The sorption mechanism was discussed in detail and the DSoHTlc will be a new kind of highly effective adsorbent for phenolic pollution.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2012年第6期683-690,共8页
Acta Chimica Sinica
基金
国家自然科学基金(No.20573065)
山西省高校科技开发(No.20091038)
2010年山西省普通高等本科学校大学生创新性实验资助项目~~
关键词
类水滑石
焙烧类水滑石
改性类水滑石
邻甲酚
吸附
MgA1 hydrotalcitelike compound （HTlc）
calcined HTlc
dodecylsulfate ionintercalatedHTIc
ocresol
sorption
