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
收稿日期: 2022-08-26
网络出版日期: 2023-06-14
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+
Received date: 2022-08-26
Online published: 2023-06-14
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。
傅明连 , 岑健梅 , 陈彰旭 . 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[J]. 无机盐工业, 2023 , 55(6) : 70 -77 . DOI: 10.19964/j.issn.1006-4990.2022-0507
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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