新型功能材料MIL-125-NH-PO的制备及其对铀酰离子的吸附性能  

Preparation of new function material MIL-125-NH-PO and its adsorption capability for U(Ⅵ)

作　　者：任政 张思秦 舒炀臻 付锡彪 彭国文 REN Zheng;ZHANG Si-qin;SHU Yang-zhen;FU Xi-biao;PENG Guo-wen(School of Resources Environment and Safety Engineering,University of South China,Hengyang 421001,China;School of Chemistry and Chemical Engineering,University of South China,Hengyang 421001,China;Engineering Technology Research Center for Decommissioning Treatment of Uranium Tailings Pond in Hunan Province,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学资源环境与安全工程学院,衡阳421001 [2]南华大学化学化工学院,衡阳421001 [3]南华大学湖南省铀尾矿库退役治理工程技术研究中心,衡阳421001

出　　处：《中国有色金属学报》2022年第11期3406-3418,共13页The Chinese Journal of Nonferrous Metals

基　　金：湖南省自然科学基金资助项目(2020JJ6050);衡阳市科技计划项目(202002042158);湖南省普惠性政策与创新环境建设计划科普专题项目(2021ZK4253)。

摘　　要：采用溶剂热法以二苯基次膦酰氯作为取代基合成了一种新型功能金属有机骨架材料MIL-125-NHPO,并通过扫描电镜(SEM)、傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)、热重分析(TGA)和X射线能谱分析(EDS)对材料进行表征,探究不同的初始条件下MIL-125-NH-PO对铀酰离子吸附性能的影响。结果表明,在pH=5、t=300 min、T=298 K、ce=40 mg/L的条件下吸附量最高可达到415.05 mg/g,吸附过程自发放热熵减,符合Langmuir等温吸附模型和准二级动力学模型,吸附性能较好。且在有多种共存离子的情况下,MIL-125-NH-PO对铀酰离子依旧有良好的选择吸附性,表明MIL-125-NH-PO是一种潜在的铀吸附剂。A novel functional metal organic framework material MIL-125-NH-PO was synthesized by solvothermal method with diphenylphosphinyl chloride as substituent.The material was characterized by SEM,FTIR,XRD,EDS and TGA.Investigate the impact on the adsorption capability of MIL-125-NH-PO with uranyl ions under different initial conditions.The results show that under the conditions of pH=5,t=300 min,T=298 K,ce=40mg/L,the maximum adsorption capacity can reach 556.62 mg/g.The entropy decreases with spontaneous heating in the adsorption process,which conforms to Langmuir isothermal adsorption model and quasi second-order kinetic model,and the adsorption performance is good.Moreover,in the case of multiple coexisting ions,MIL-125-NH-PO still has good selective adsorption for uranyl ions,indicating that MIL-125-NH-PO is a potential uranium adsorbent.

关 键 词：MOFS 铀酰离子 功能化 吸附 

分 类 号：X703[环境科学与工程—环境工程]