壳聚糖/蒙脱土插层复合物对活性红染料的吸附动力学及解吸性能  

Adsorption kinetics of chitosan /montmorillonite intercalation composites for Reactive Red dye and desorption properties

作　　者：程华丽[1] 李瑾[1,2] 王涵[1] 焦淑芳[1] 马启敏[1,2] 

机构地区：[1]中国海洋大学环境科学与工程学院,青岛266100 [2]中国海洋大学海洋环境与生态教育部重点实验室,青岛266100

出　　处：《环境化学》2014年第1期115-122,共8页Environmental Chemistry

基　　金：国家自然科学基金(41106067);山东省自然科学基金(ZR2010BQ013);国家水体污染控制与治理科技重大专项(2008ZX07106003);中国海洋大学中央高校基本科研业务费专项资金项目(201013032)资助

摘　　要：采用溶液插层法制备了壳聚糖/蒙脱土插层复合物,以此复合物为活性红染料RR136的吸附剂,考察了复合物中壳聚糖与蒙脱土的摩尔比、染料溶液pH和浓度、温度及吸附剂用量等因素对吸附动力学行为的影响.运用红外光谱和扫描电镜对吸附RR136前后的吸附剂进行了表征,探讨了染料分子与吸附剂之间的相互作用,研究了吸附剂的再生性能.结果表明,壳聚糖/蒙脱土插层复合物对RR136的吸附更符合拟二级动力学方程,RR136在该复合物上的吸附速率受颗粒外扩散过程的控制.连续进行15次吸附/再生循环后,吸附剂的吸附容量和再生率分别为266.27 mg·g-1和60.5%,表明插层复合物吸附剂具有较好的再生重复使用潜力.The chitosan/montmorillonite （CTS/MMT） intercalation composites were prepared by polymer solution intercalation. The effects of molar ratio of CTS to MMT, initial pH, concentration of the dye solution ,temperature and mass of adsorbent on the adsorption kinetics for Reactive Red 136 （RR136） dye have been investigated in detail. The structures of intercalation composites before and after adsorption of RR 136 were characterized by SEM and FI＇IR. The regeneration performance of the adsorbent was studied. The results showed that all the adsorption processes were better fitted by the pseudo-second-order equation, indicating that the rate of adsorption is determined mainly by external particle diffusion process. After 15 times consecutive adsorption/regeneration, adsorption capacity and regeneration efficiency was 266.27 mg·g^-1 and 60.5 % , respectively, which indicated that the intercalation compound adsorbent has good regeneration and reuse potential.

关 键 词：壳聚糖 蒙脱土 活性红染料 动力学 吸附再生 

分 类 号：X703[环境科学与工程—环境工程]