摘要
以壳聚糖(CS)为母体负载纳米铁(NFeMs),并在聚乙二醇(PEG)交联作用下制备CS-NFeMs-PEG凝胶球,通过间歇批次试验探索该凝胶球在不同条件下对Cu(Ⅱ)吸附效果.CS-NFeMs-PEG凝胶球的最佳吸附pH值为5.5,吸附平衡时间20 h,吸附过程更符合拟二级吸附动力学模型;该吸附过程是自发、吸热、熵增过程;吸附等温线拟合得Cu(Ⅱ)的饱和吸附量为133.4 mg·g-1;红外图谱分析表明,CS成功负载NFeMs并与PEG交联生成复合物;扫描电镜表征说明,CS-NFeMs-PEG凝胶球内部呈三维网状结构.经5次脱附再生后吸附量保持在70 mg·g-1左右,材料具有较好的循环使用性.
CS-NFeMs-PEG gel spheres were prepared by using chitosan(CS)as parent-loaded Fe(NFeMs)and under crosslinking of PEG.By intermittent batch test to explore the gel ball under different conditions of Cu(Ⅱ)adsorption effect.The optimal adsorption pH of CS-NFeMs-PEG gel spheres was 5.5.The equilibrium time of adsorption was about 20 h and the adsorption process was more consistent with the quasi-second-order dynamic model.The adsorption process was spontaneous,endothermic and entropy increasing.According to the adsorption isotherm fitting,saturated adsorption capacity of Cu(Ⅱ)was 133.4 mg·g-1.Infrared spectrum analysis showed that CS loaded NFeMs and reacted with PEG form complex substance.Scanning electron microscopy analysis showed that CS-PEG-NFeMs had three-dimensional network structure inside.After 5 times of desorption regeneration,the adsorption capacity remained about 70 mg·g-1and the material had good recycling property.
作者
刘珊
赵春朋
李涛
冯婷
刘丹荣
张悦
魏莉
LIU Shan;ZHAO Chunpeng;LI Tao;FENG Ting;LIU Danrong;ZHANG Yue;WEI Li(Key Laboratory of Underground Hydrology and Ecological Effects,Ministry of Education,School of Water and Environment,Chang'an University,Xi'an,710054,China;Yangtze River Ecological Protection Group Company of Limited Liability,Wuhan,430014,China)
出处
《环境化学》
CAS
CSCD
北大核心
2020年第7期2013-2021,共9页
Environmental Chemistry
基金
国家自然科学基金(51778057)资助
