Adsorption of Pb(Ⅱ)in Water by Niobate/Titanate Nanoflakes  

作　　者：DING Qingwei SUI Rui LIU Xiaona QIAN Tianwei 丁庆伟;隋睿;LIU Xiaona;钱天伟(College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China;College of EnvironmentalScience and Engineering,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China [2]College of EnvironmentalScience and Engineering,Taiyuan University of Technology,Jinzhong 030600,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第4期726-732,共7页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(41272375);the Key Research and Development Plan of Shanxi Province(No.201903D121085)。

摘　　要：A niobate/titanat nanoflakes(Nb/TiNFs)composite was synthesized via the hydrothermal method and used to remove Pb(Ⅱ)from water.XRD,TEM,and SEM results indicate that Nb/TiNFs appear as nanoflakes,of which the primary crystal phase is tri-titanate.Nb/TiNFs show rapid adsorption kinetics and the result fits well with the pseudo-second order model.The key mechanism of adsorption is ion-exchange between metal and-ONa/H.According to the Langmuir isotherm model,the maximum capacity of Pb(Ⅱ)is 488.323 mg·g^-1.The relatively low RL values indicate that Nb/TiNFs exhibit favorable adsorption of Pb(Ⅱ).Nb/TiNFs indicate high adsorption capacity over a broad pH range.Co-existing inorganic ions(Na+and Ca^2+)have a slight inhibition effect on adsorption,and HA moderately inhibits the adsorption of Pb(Ⅱ)on Nb/TiNFs.Because of the simple method of synthesis and high removal efficiency for heavy metals,Nb/TiNFs are a promising material in remediation of heavy metal polluted water.

关 键 词：Nb/TiNFs Pb(Ⅱ) ADSORPTION ion-exchange 

分 类 号：X703[环境科学与工程—环境工程]