CMC-g-PAA/AM/ATP水凝胶对水体中Cd(Ⅱ)的吸附性能及机理研究  

Studies on Removal and Mechanisms of Cd(Ⅱ) Ions from Aqueous Solution Using CMC-g-PAA/AM/ATP

作　　者：邓红梅[1] 张紫君[1,2] 许楠[2] 

机构地区：[1]广州大学环境科学与工程学院,广州510006 [2]北京大学深圳研究生院环境与能源学院,深圳518055

出　　处：《北京大学学报（自然科学版）》2016年第3期545-552,共8页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金(41170399);广州市科技计划2015科学研究专项(20151010225)资助

摘　　要：在凹凸棒黏土（ATP）的存在下,以羧甲基纤维素（CMC）为主链,过硫酸铵（APS）作为引发剂,以N,N-亚甲基双丙烯酰胺（MBA）作交联剂,与丙烯酸（AA）和丙烯酰胺（AM）进行接枝共聚,合成羧甲基纤维素-接枝-聚丙烯酸/丙烯酰胺/凹凸棒黏土（CMC-g-PAA/AM/ATP）复合水凝胶。采用该种材料吸附去除水体中的Cd（Ⅱ）,考察溶液初始p H、金属离子浓度、反应时间、反应温度、吸附剂投加量等因素对吸附反应的影响,并借助傅里叶转换红外光谱（FT-IR）和X射线光电子能谱（XPS）探究吸附机理。结果表明,初始p H范围在4.0~8.0内吸附效果佳,吸附反应在40分钟内达到平衡,整个吸附过程更符合准二级动力学模型,吸附过程中放热。CMC-g-PAA/AM/ATP可以快速、有效地去除水溶液中的Cd（Ⅱ）,吸附机理包括静电作用、络合作用和离子交换作用。This paper analyzes the spatial distribution of two kinds of national wetland parks and their differences and similarities by applying GIS and the methods of nearest neighbor index, Gini coefficient and kernel density estimation. Their influencing factors from the aspects of natural geography, social economy, and cultural environment are discussed with the use of SPSS and geographic analysis methods. Results show that the different development of two kinds of national wetland parks is closely related to different decisions of competent authorities and the attention of the government. They both have the agglomerate trend across the nation in spatial distribution, imbalanced status of state-level wetland parks distribution, but their distribution densities are different. South Jiangsu-North Zhejiang, East Hubei-North Hunan and Southwest Shandong are the three highdensity national wetland park distribution centers, while South Jiangsu and Northeast Shandong form high-density urban wetland park distributions. Finally, this paper discusses the factors that cause the situation in three aspects which include natural conditions, social economic conditions and cultural environment.

关 键 词：CMC-g-PAA/AM/ATP Cd(Ⅱ) 吸附 机理 

分 类 号：X52[环境科学与工程—环境工程]