Chromate separation by selective crystallization  

作　　者：Xijian Chen Xing Dai Rongzhen Xie Jie Li Afshin Khayambashi Lei Xu Chuang Yang Nannan Shen Yaxing Wang Linwei He Yugang Zhang Chengliang Xiao Zhifang Chai Shuao Wanga 

机构地区：[1]State Key Laboratory of Radiation Medicine and Protection,School of Radiation Medicine and Protection,Collaborative Innovation Center of Radiological Medicine of Jiangsu Higher Education Institutions,Soochow University,Suzhou 215123,China [2]College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China

出　　处：《Chinese Chemical Letters》2020年第7期1974-1977,共4页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.21790374,21825601,U1732112,21876124);the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD);the Fundamental Research Funds for the Central Universities(No.2019QNA4047)。

摘　　要：A new paradigm to remove toxic chromate anions from aqueous solution by crystallization of chromatewater clusters with imine-linked guanidinium cationic ligands is introduced.The guanidium-based cationic ligand was easily prepared through the imine condensation of an alde hyde and aminoguanidine hydrochloride.The cationic imine-linked guanidinium liga nd(BBIG-CI)showed a high re moval capacity(292.5 mg/g)in the solutions.Rapid decontamination of chromate anions from the wastewater by this cationic ligand was resulted from an instantaneous crystallization.The produced guanidium chromate salts have an extremely low solubility(Ksp,BBIG=8.19×10^9).Such superior removal performance of these mate rials was attributed to the cha rge-assisted hydrogen bonding between the cationic ligand and chromate-water hydrate anions,which was revealed by the single-crystal X-ray diffraction analysis and density functional theory(DFT)calculations.In addition,the succes s ful recove ry of the guanidium-based ligand makes it more attractive for real-world applications.

关 键 词：CHROMATE CRYSTALLIZATION Hydrogen bonding Chromate-water clusters Guanidinium ligand 

分 类 号：X703[环境科学与工程—环境工程] O641.4[理学—物理化学]