硬脂酸钠改性蒙脱石对水中亚甲基蓝的吸附性能研究  

Adsorption of Methylene Blue on Sodium stearate Modified montmorillonite

作　　者：陈代梅[1] 陈建[2] 栾兴龙[2] 姬海鹏[2] 许峰[2] 廖立兵[2] 

机构地区：[1]中国地质大学(北京)矿物岩石材料开发应用国家专业实验室,北京100083 [2]中国地质大学(北京)材料科学与工程学院,北京100083

出　　处：《矿物岩石地球化学通报》2011年第2期123-128,共6页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：北京市大学生科学研究与创业行动建设项目;中央高校基本科研业务费专项项目(2010ZY37);中国地质大学(北京)教学实验室(中心)开放基金项目;中国地质大学(北京)矿物岩石材料开发应用国家专业实验室资助项目(09A003)

摘　　要：以阴离子表面活性剂硬脂酸钠为改性剂制备了硬脂酸钠改性蒙脱石(NaSTA-MMT).FI-IR和XRD分析表明插层剂已进入蒙脱石层间,且随着硬脂酸钠量的增加蒙脱石层间距从1.274 nm增加到4.805 nm。亚甲基蓝吸附实验表明,硬脂酸钠改性蒙脱石吸附行为遵循伪二级动力学方程。平衡吸附量与平衡质量浓度之间的关系符合Langmuir等温吸附方程所描述的规律。硬脂酸钠改性膨润吸附亚甲基蓝表现为自发的表面物理吸附过程,吸附活化能、吸附焓变和熵变分别为2.36 kJ/mol-、21.47 kJ/mol和-44.45 J/mol.K。Sodium stearate modified montmorillonite（NaSTA-MMT） was prepared using the anion surfactant,sodium stearate,and its structure was characterized by X-ray and FI-IR diffraction.The results showed that sodium stearate had been intercalated into the interlayers of montmorillonite and the layer spacing was expanded from 1.274 nm to 4.805 nm as the loading concentrations of sodium stearate increased.The adsorption of methylene blue on NaSTA-MMT was also examined.The experiment showed that the kinetic adsorption of methylene blue onto NaSTA-MMT was described best by a pseudo-second-order model and that the adsorption isotherm was in good agreement with the Langmuir equation.The activation energy,enthalpy and entropy of methylene blue adsorption on NaSTA-MMT were estimated as 2.36 kJ/mol,-21.47 kJ/mol and 44.45 J/mol·K,respectively,indicating a physical adsorption process.

关 键 词：蒙脱石 改性 硬脂酸钠 吸附 亚甲基蓝 

分 类 号：X703[环境科学与工程—环境工程]