摘要
制备了膨润土负载纳米铁铜双金属复合材料(FeCu/BT),用SEM、EDS、FTIR、XRD、XPS进行表征并分析铀去除机理,考察了pH、投加量、初始浓度、离子干扰等因素对水溶液中铀去除效果的影响。结果表明,在pH为7、投加量为4 g/L、反应时间为60 min、初始铀质量浓度为10 mg/L时,铀去除率达到95.5%。共存离子PO43-对去除效率的影响最大,SO42-、NO3-几乎无影响。FeCu/BT除铀过程的吸附动力学符合准二级动力学模型,以化学吸附为主;等温吸附模型符合Freundlich等温吸附模型,为非均一多分子层吸附。FeCu/BT除铀过程主要为吸附、还原、络合作用,Cu起到催化、固定和吸附的作用。
Bentonite-supported nano-iron-copper bimetal material(FeCu/BT)was prepared,characterized by SEM,EDS,FTIR,XRD,and XPS,and its uranium removal mechanism was analyzed.The uranium removal from aque-ous solutions at different pH,dosage,initial concentration,and ion interference conditions were studied.Experiments showed that the removal rate of uranium reached 95.5%at the conditions of pH=7,the dosage 4 g/L,the reaction time 60 min,and the initial uranium mass concentration 10 mg/L.Co-existing ion PO43-had the most negative effect on re-action,meanwhile that SO42-and NO3-almost had no effect.The adsorption kinetics of uranium removal by FeCu/BT was well fitted with pseudo-second-order model and dominated by chemical adsorption.And the isothermal adsorp-tion conformed to Freundlich model,which was heterogeneous multilayer adsorption.The process of uranium removal mainly included adsorption,reduction,complexation,and Cu played the role of catalysis,fixation and adsorption.
作者
招国栋
凌显勇
邓真宁
滑熠龙
刘清
Zhao Guodong;Ling Xianyong;Deng Zhenning;Hua Yilong;Liu Qing(School of Resources,Environment and Safety Engineering,University of South China,Hengyang 421001,China;Key Laboratory of Pollution Control and Resource Recovery of Hunan Province,Hengyang 421001,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2020年第12期83-87,共5页
Industrial Water Treatment
基金
国家自然科学基金(51508317)
湖南省教育厅基金(18C0432)
铀矿冶放射性控制技术湖南省工程研究中心、湖南省铀尾矿库退役治理技术工程技术研究中心联合开放课题(2018YKZX2011)。
关键词
绿色合成
膨润土
纳米铁铜
含铀废水
green synthesis
bentonite
nano-iron-copper
wastewater containing uranium
