交联壳聚糖季铵盐对水体中硝酸盐的吸附去除研究  

ADSORPTION OF NITRATE FROM WATER BY CROSS-LINKED QUATERNARY CHITOSAN SALT

作　　者：魏峣 程诚[2] 吕龙[2] 张静[2] 于静[2] 谢燕华[2,3] 

机构地区：[1]四川省环境保护科学研究院,610041 [2]成都理工大学环境与土木工程学院,610059 [3]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《水处理技术》2012年第9期21-25,共5页Technology of Water Treatment

基　　金：国家自然基金(51109019)

摘　　要：将交联壳聚糖季铵盐用于水体中NO3-的吸附去除,考察了pH、共存阴离子对吸附过程的影响以及吸附剂的重复使用性能,并对吸附过程进行了动力学和吸附等温模型分析。结果表明,当溶液的pH在3.5～10.2之间时,pH对吸附过程的影响较小;水体中共存阴离子会与NO3-产生一定的竞争作用,其影响顺序为:Cl->SO42->HCO3-;该吸附反应非常迅速,吸附主要发生在反应前1 min内,且在10 min内达到吸附平衡;该吸附过程符合准二级动力学模型,化学吸附为吸附的主要速率控制步骤;吸附过程符合Freundlich吸附等温模型,表明吸附过程以均相吸附反应为主;同时,该吸附剂具有很好的再生性能,1%的NaCl再生液可迅速、高效地实现饱和吸附剂的再生。Cross-linked quaternary chitosan salt was used to adsorb nitrate from water. The effect ofpH and co-existing anions on the adsorption process, adsorption isotherms and kinetics, and its regeneration ability were investigated by batch experiments. The effect ofpH on the adsorption process was not significantly in a range from 3.5 to 10.2. The effect of co-existing anions on nitrate adsorption followed the order： C1〉 SO4^2〉 HCO3. The adsorption reaction was fast and it could reach to reaction equilibrium within l O min. The adsorption data fitted Tempkin isotherm model and Pseudo-second-order model well, which showed that chemical adsorption was a rate-limiting stage during the adsorption process. The spent adsorbents could be regenerated by NaC1 solution with the.concentration of 1% effectively and fast. These results suggest that the cross-linked chitosan quaternary ammonium salt provides a promising method for nitrate removal from water.

关 键 词：交联壳聚糖季铵盐 硝酸盐 吸附 再生 

分 类 号：TQ424[化学工程]