复合改性膨润土对亚甲基蓝的吸附性能研究

Research on the adsorption capability of compound modified bentonite for methylene blue

采用盐酸、四甲基氯化铵和聚合羟基铝对膨润土进行复合改性,研究了复合改性膨润土对亚甲基蓝的吸附性能,并对影响吸附效果的因素进行了考察。结果表明:该复合改性膨润土对亚甲基蓝具有良好的吸附性能。其应用p H范围广,有着较强的酸碱环境适用性;吸附剂投加量、溶液盐度等对吸附效果均有一定的影响。该吸附过程符合准二级动力学模型,Langmuir等温吸附模型可以较好地描述复合改性膨润土对亚甲蓝的吸附过程,吸附量为178.89 mg/g。

Hydrochloric acid, tetramethylammonium chloride and polyhydroxyl aluminum have been used for the compound modification of bentonite,the adsorption capability of the compound modified bentonite for methylene blue researched,and the factors influencing adsorption effect investigated. The results show that the compound modified bentonite has good adsorption capability for methylene blue. It is characterized by wide p H application range,and wide suitability in acidic and basic environments. The dosage of absorbent,salinity of solution,etc. all have certain influences on adsorption effects. The adsorption process complies with pseudo-second-order kinetics model,and Langmuir isothermal adsorption model,which can describe the adsorption process of compound modified bontonite for methylene blue well. Its adsorption capacity is 178.89 mg/g.