镁铝水滑石的制备及其对铅离子的吸附性能  

Preparation of Mg-Al Hydrotalcite and Its Adsorption of Lead Ions in Wastewater

作　　者：张辉[1] 陆嘉炜[1] 余剑清 郭亚平[1] 

机构地区：[1]上海师范大学生命与环境科学学院,上海200234

出　　处：《广州化工》2017年第8期69-72,共4页GuangZhou Chemical Industry

基　　金：上海市科委地方能力建设项目(14520502800);宝钢发展有限公司(C-6105-15-059)

摘　　要：采用共沉淀法合成镁铝碳酸根型水滑石(MgAl-CO_3-LDHs),并研究它对污水中铅离子的吸附性能。结果表明:MgAl-CO_3-LDHs颗粒呈现为六角片状结构,对污水中的铅离子具有良好的吸附性能,其主要吸附机制为化学吸附。置于含Pb2+的污水后,水滑石中的层间CO_3^(2-)释放出来,与污水中的铅离子反应生成块状的水白铅矿(Pb(CO_3)_2(OH)_2),且提高溶液的pH值有助于增强MgAl-CO_3-LDHs对铅离子的吸附,其吸附容量可达到224 mg/g。由此可见,MgAl-CO_3-LDHs在吸附重金属铅离子领域具有很大的实际应用价值。Magnesium aluminum carbonate hydrotalcite （MgAl-CO3 -LDHs ） was successfully synthesized by coprecipitation method and applied in adsorption of lead ions in sewage. The adsorption mechanism was studied according to the change of phase structure and microstructure. The results showed that the MgAl- CO3 -LDHs particles had good adsorption performance for lead ions in sewage. The main adsorption mechanism of MgAl-CO3-LDHs belonged to chemical adsorption. After the MgA1-CO3 -LDHs were placed on the wastewater containing lead ions, the interlayer carbonate ions were released to react with the lead ions in the effluent, forming massive water white lead. In addition, improving the pH of the solution helped to increase MgAl-CO3-LDHs adsorption of lead ions with the highest adsorption capacity of 224 mg/g. Thus, the magnesium aluminum carbonate hydrotalcite was ideal for using in heavy metal ions adsorption.

关 键 词：镁铝碳酸根型水滑石 铅离子 吸附 

分 类 号：TQ085[化学工程]