壳聚糖改性沸石分子筛再生方法选择及优化  

Selection and Optimization of Regeneration Method for Chitosan-Modified Zeolite Molecular Sieve

作　　者：郜玉楠[1] 包顺宇 王静 周历涛 GAO Yu′nan;BAO Shunyu;WANG Jing;ZHOU Litao(School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2020年第2期378-384,共7页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51508342);辽宁省自然科学基金项目(201602607);沈阳建筑大学科研创新培育计划项目(CXPY2017008)。

摘　　要：目的研究硝酸盐氮饱和壳聚糖改性沸石分子筛的再生方法及再生剂优化,从而达到壳聚糖改性沸石分子筛复合吸附颗粒最佳的再生效果.方法制备壳聚糖改性沸石分子筛,分别使用热再生、水再生及浓度为1 mol/L的HCl、NaOH、NaCl、Na 2CO3、NaHCO3、CaCl2溶液进行再生.然后对再生剂浓度、再生时间、再生pH值、再生温度进行优化,得到硝酸盐氮饱和壳聚糖改性沸石分子筛的最佳再生条件.结果最佳再生剂阳离子浓度为0.8 mol/L的Na 2CO3溶液,再生时间为24 h,再生pH值为7,再生温度为30℃为最佳再生条件.结论壳聚糖改性沸石分子筛用于去除地下水中的硝酸盐氮,直至吸附饱和后脱附再生,使其恢复再次利用能力,从而可以重复多次利用,可减少二次污染和运行成本,适用于净水厂的提标改造.The regeneration method of the best nitrate-saturated chitosan-modified zeolite molecular sieve and its regenerant optimization were studied to achieve the optimal regeneration effect of chitosan-modified zeolite molecular sieve composite adsorption particles.Zeolite molecular sieves were regenerated using thermal regeneration,water regeneration and HCl,NaOH,NaCl,Na2CO3,NaHCO3,CaCl2 solutions at a concentration of 1 mol/L.The regenerant concentration,regeneration time,regeneration pH,and regeneration temperature were then optimized.The optimal regeneration conditions of nitrate-saturated chitosan-modified zeolite molecular sieves were obtained.The best regenerant was Na2CO3 solution with a cation concentration of 0.8 mol/L.The regeneration time was 24 h,the regeneration pH was 7,and the regeneration temperature was 30℃is the best regeneration condition.Chitosan modified zeolite molecular sieve is used to remove nitrate nitrogen in groundwater.After adsorption saturation,it can be reused again through its desorbed and regenerated.Because it can be reused many times,secondary pollution and operating costs can be reduced.So it is suitable for the upgrading of water purification plants.

关 键 词：壳聚糖 沸石分子筛 硝酸盐氮 吸附 再生 

分 类 号：X523[环境科学与工程—环境工程]