摘要
通过水热法制备蒙脱土/Fe_(3)O_(4)/腐殖酸复合材料(MFH),探究pH值、MFH的投加量、吸附时间、U(Ⅵ)初始浓度及温度等因素对MFH吸附U(Ⅵ)的影响。结果表明:在所选实验条件范围内,MFH的投加量对其吸附U(Ⅵ)的影响最大;当U(Ⅵ)初始浓度为5 mg·L^(-1),pH值为6,MFH投加量为0.3 g·L^(-1),温度为30℃时,MFH对U(Ⅵ)去除在30 min后达到平衡,此时去除率达到97.7%;MFH对U(Ⅵ)的吸附符合准二级动力学模型和Langmuir模型;MFH对U(Ⅵ)的去除机理为络合作用和还原作用。再生实验表明,经5次吸附-解吸后,MFH复合材料对U(Ⅵ)的吸附率仍在90%以上,表明MFH对U(Ⅵ)的去除效果较好且具有高效重复利用性。
The montmorillonite/Fe_(3)O_(4)/humic acid composite(MFH)was prepared by hydrothermal method.The effects of pH value,MFH dosage,adsorption time,initial concentration of U(Ⅵ)and temperature on the adsorption of U(Ⅵ)by MFH were investigated.The experiment shows that the dosage of MFH has the greatest influence on the adsorption of U(Ⅵ)within the selected test conditions;when the initial concentration of U(Ⅵ)is 5 mg·L^(-1),the pH value is 6,and the dosage of MFH is 0.3 g·L^(-1),and the temperature is 30℃,the removal of U(Ⅵ)by MFH reaches the adsorption equilibrium after 30 min,and the adsorption rate reaches 97.7%.The adsorption of U(Ⅵ)by MFH conforms to the quasi-second-order kinetic model and Langmuir model;the removal mechanism of MFH to U(Ⅵ)is complexation and reduction.The adsorption-desorption tests show that the adsorption rate of U(Ⅵ)by MFH composites is still as high as 90%after 5 cycles.The test shows that MFH has a good removal efficiency and efficient reusability for U(Ⅵ).
作者
司子彦
谢水波
朱奥琦
王国华
刘迎九
莫官海
SI Zi-yan;XIE Shui-bo;ZHU Ao-qi;WANG Guo-hua;LIU Ying-jiu;MO Guan-hai(School of Civil Engineering,University of South China,Hengyang 421000,Hunan,China;Hunan Provincial Key Laboratory of Pollution Control and Resources Technology,University of South China,Hengyang 421000,Hunan,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2021年第3期158-166,共9页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(11475080)。
