铜基壳聚糖气凝胶的制备及对铀的吸附性能  

Preparation of Copper-based Chitosan Aerogel and its Adsorption Properties for Uranium

作　　者：王艳 艾玉勇[3] 肖惠莹 孙英捷 刘小林 谢英荣 陈擘威 WANG Yan;AI Yuyong;XIAO Huiying;SUN Yingjie;LIU Xiaoin;XIE Yingrong;CHEN Bowei(School of Mathematics and Science,Mianyang Teachers'College,Mianyang,Sichuan 621000;Center for Nuclear Waste Treatment Engineering Research,Mianyang Teachers'College,Mianyang,Sichuan 621000;School of Life Science and Technology,Mianyang Teachers'College,Mianyang,Sichuan 621000)

机构地区：[1]绵阳师范学院数理学院,四川绵阳621000 [2]绵阳师范学院核废料处理工程研究中心,四川绵阳621000 [3]绵阳师范学院生命科学与技术学院,四川绵阳621000

出　　处：《绵阳师范学院学报》2024年第11期37-46,共10页Journal of Mianyang Teachers＇ College

基　　金：绵阳师范学院博士启动项目(QD2021A15);绵阳师范学院校级创新团队项目(CXTD2023PY01).

摘　　要：含铀废水对生态环境及人类生命安全具有严重的威胁,因此对含铀废水的处理极为迫切.通过溶胶凝胶法得到了一类新型的铜基壳聚糖气凝胶(Cu-CSAs),采用傅里叶红外光谱分析(FTIR)、X射线光电子能谱仪(XPS)、场发射扫描电镜(FESEM)、热重(TG)对材料结构进行了表征,探讨了对水中六价铀U(VI)的吸附性能.考察了溶液pH、吸附剂用量、接触时间、U(VI)的初始浓度、共存离子、离子强度对吸附的影响,并采用模拟含铀废水探讨了其实用性.结果表明:当溶液pH为5,U(VI)的初始浓度为10 mg/L,Cu-CSA-1最适用量为0.1 g/L时,其平衡时间为30 min,该吸附过程符合准二阶动力学模型.298 K时,其最大吸附量高达548.9 mg/g.此外,Cu-CSA-1对U(VI)有较好的选择性,在模拟含铀废水中去除率达65%左右,表明Cu-CSA-1在含U(VI)废水的修复中具有潜在的应用价值.Uranium-containing wastewater is a serious threat to the ecological environment and human life safety,so the treatment of uranium wastewater is extremely urgent.A type of Cu(II)modified chitosan aerogel(Cu-CSAs)was prepared by sol-gel method.The obtained Cu-CSAs were characterized by Fourier infrared spectroscopy(FTIR),X-ray diffraction(XPS),scanning electron microscopy(FESEM)and thermogravimetric(TG).The U(VI)adsorption performances of Cu-CSAs were studied.The influences of pH,the amount of adsorbent,contact time,initial concentration of U(VI),common coexisted ions and ions strength were discussed detailly.The results exhibited that the optimal pH,the initial concentration of U(VI)and the dosage of Cu-CSAs were 5,10 mg/L and 0.1 g/L,respectively.The equilibrium time was 30 min,and the adsorption process was accorded well with the pseudo-second-order kinetic model,inferring the chemical adsorption was the rate controlling step.In addition,Cu-CSAs exhibited good selectivity for U(VI).The satisfactory U(VI)uptake performance of Cu-CSAs in simu-lated wastewater samples demonstrated the prepared Cu-CSAs possess potential practical value in U(VI)extraction.

关 键 词：铜基 壳聚糖气凝胶 含铀废水 吸附 

分 类 号：X591[环境科学与工程—环境工程] TQ424.3[化学工程]