有机改性膨润土对水中硫氰根离子吸附性能和机理研究  

Study of adsorption characteristics and mechanisms of organobentonite for thiocyanate ion in water

作　　者：孟磊[1] 段炼[1] 李静[1] 胡宁[1] 高晋云[1] 王红[1] 谢鲜梅[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《日用化学工业》2013年第2期81-84,152,共5页China Surfactant Detergent & Cosmetics

基　　金：国家自然科学基金资助项目(50872086);太原市科技资助项目(120238);太原理工大学2012年校青年基金资助项目(2012L018)

摘　　要：研究了以阳离子表面活性剂十六烷基三甲基溴化铵和四甲基氯化铵共同改性而成的双阳离子有机膨润土对水中硫氰根离子吸附的特征及机理。结果表明,在温度25℃,溶液pH=7,硫氰根离子质量浓度为0.05 g·L-1的100 mL溶液中,加入有机改性膨润土质量1.5 g条件下,振荡吸附60 min,有机改性膨润土对硫氰根离子的吸附率可达97.05%。有机改性膨润土对硫氰根离子的等温吸附符合Langmuir等温吸附模型,吸附动力学更适合准一级动力学吸附模型,热力学参数计算表明,该吸附过程为自发过程,加热不利于反应的进行。Adsorption characteristics and mechanisms of bentonite organo - modified with joint action of two kinds of cationic surfactant, cetyhrimethylammonium bromide and tetramethylammonium chloride for thiocya- nate ion in water was studied. Adsorption experimental results showed that, under temperature of 25 ℃ ;pH of isotherm for thiocyanate ion corresponds with Langmuir equation. Kinetics study results showed that the adsorption follows the pseudo - first order kinetic adsorption model. The value of the thermodynamic parameters indicated that the adsorption is a spontaneous process, and heat is not favorable for the adsorption process.

关 键 词：阳离子表面活性剂 有机改性膨润土 硫氰根离子 吸附 

分 类 号：X784[环境科学与工程—环境工程] TQ028.15[化学工程]