无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2023, Vol. 55 ›› Issue (6): 70-77.doi: 10.19964/j.issn.1006-4990.2022-0507

• 研究与开发 • 上一篇    下一篇

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

傅明连1,2,3(), 岑健梅1, 陈彰旭1,2,3   

  1. 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
  • 收稿日期:2022-08-26 出版日期:2023-06-10 发布日期:2023-06-14
  • 作者简介:傅明连(1980— ),女,硕士,副教授,主要从事功能材料研究;E-mail:fuminglian@126.com
  • 基金资助:
    福建省自然科学基金资助项目(2022J011163);福建省自然科学基金资助项目(2017J01710);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);莆田学院功能材料研究创新团队(科研[2022]10号)

Study on preparation of magnetic SiO2/chitosan composite aerogel and its adsorption for Cu2+

FU Minglian1,2,3(), CEN Jianmei1, CHEN Zhangxu1,2,3   

  1. 1. College of Environmental and Biological Engineering,Putian University,Putian 351100,China
    2. Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants,Putian 351100,China
    3. Key Laboratory of Ecological Environment and Information Atlas,Fujian Provincial University,Putian 351100,China
  • Received:2022-08-26 Published:2023-06-10 Online:2023-06-14

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 m2/g,平均孔径为19.02 nm,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50 mg、铜离子初始质量浓度为10 mg/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。

关键词: 磁性, 吸附, 二氧化硅, 壳聚糖, 复合气凝胶

Abstract:

Fe3O4 was prepared by co-precipitation method,and SiO2 was wrapped on the surface of Fe3O4 by modified stober method to prepare magnetic SiO2,and then the magnetic SiO2/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 m2/g,the average pore diameter was 19.02 nm,and the composite aerogel was a mesoporous material,it was favorable for the adsorption of Cu2+.The effects of the pH value,the dosage of composite aerogel and the initial concentration of Cu2+ 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 Cu2+ was 10 mg/L,the adsorption rate of composite aerogel for Cu2+ reached 98.99 %,and was still relatively high after recycling for 4 times.The adsorption process of Cu2+ was followed the Langmuir adsorption isotherm model and the pseudo-secondary-order kinetic model,and it was an entropy-increasing and endothermic spontaneous chemisorption process.

Key words: magnetic, adsorption, silica, chitosan, composite aerogel

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