磁性二氧化硅/壳聚糖复合气凝胶的制备及其对铜离子的吸附研究  

Study on preparation of magnetic SiO_(2)/chitosan composite aerogel and its adsorption for Cu^(2+)

作　　者：傅明连 岑健梅 陈彰旭 FU Minglian;CEN Jianmei;CHEN Zhangxu(College of Environmental and Biological Engineering,Putian University,Putian 351100,China;Fujian Provincial Key Laboratory of Ecology-Toxicological Effects&Control for Emerging Contaminants,Putian 351100,China;Key Laboratory of Ecological Environment and Information Atlas,Fujian Provincial University,Putian 351100,China)

机构地区：[1]莆田学院环境与生物工程学院,福建莆田351100 [2]福建省新型污染物生态毒理效应与控制重点实验室,福建莆田351100 [3]福建省高校生态环境及其信息图谱重点实验室,福建莆田351100

出　　处：《无机盐工业》2023年第6期70-77,共8页Inorganic Chemicals Industry

基　　金：福建省自然科学基金资助项目(2022J011163,2017J01710)资助;2022年福建省科技特派员资金项目资助;福建省大学生创新创业训练计划项目(201911498029)资助;莆田学院功能材料研究创新团队(科研[2022]10号)资助。

摘　　要：采用共沉淀法制备四氧化三铁,通过改进Stober法将二氧化硅包裹在四氧化三铁表面,制备磁性二氧化硅,进一步制得磁性二氧化硅/壳聚糖复合气凝胶。通过扫描电镜(SEM)、X射线衍射仪(XRD)、比表面积测试(BET)和红外光谱分析(FT-IR)对其结构进行表征。结果表明,复合气凝胶的比表面积为24.93 m^(2)/g,平均孔径为19.02nm,是一种介孔材料,有利于对铜离子的吸附。考察了pH、复合气凝胶用量和铜离子初始浓度对吸附性能的影响。当pH为6.0、复合气凝胶用量为50mg、铜离子初始质量浓度为10mg/L时,复合气凝胶对铜离子的吸附率达98.99%,且循环使用4次后吸附率仍较高。复合气凝胶对铜离子的吸附过程遵循Langmuir吸附等温模型和准二级动力学方程,是一种熵增、吸热自发的化学吸附过程。Fe_(3)O_(4) was prepared by coprecipitation method,and SiO_(2)was wrapped on the surface of Fe_(3)O_(4) by modified stober method to prepare magnetic SiO_(2),and then the magnetic SiO_(2)/chitosan composite aerogel was prepared.The structure of composite aerogel was characterized by scanning electron microscopy(SEM),X-ray diffraction(XRD),specific surface area testing(BET),and Fourier transform infrared spectrometer(FT-IR),and the results showed that the specific surface area of composite aerogel was 24.93 m^(2)/g,the average pore diameter was 19.02 nm,and the composite aerogel was a mesoporous material,it was favorable for the adsorption of Cu^(2+).The effects of the pH value,the dosage of composite aerogel and the initial concentration of Cu^(2+)on the adsorption performance were investigated.When the pH value was 6.0,the dosage of composite aerogel was 50 mg,the initial concentration of Cu^(2+)was 10 mg/L,the adsorption rate of composite aerogel for Cu^(2+)reached 98.99%,and was still relatively high after recycling for 4 times.The adsorption process of Cu^(2+)was followed the Langmuir adsorption isotherm model and the pseudosecondaryorder kinetic model,and it was an entropyincreasing and endothermic spontaneous chemisorption process.

关 键 词：磁性 吸附 二氧化硅 壳聚糖 复合气凝胶 

分 类 号：TQ127.2[化学工程—无机化工]