Novel sulfhydryl functionalized covalent organic frameworks for ultra-trace Hg^(2+) removal from aqueous solution  

作　　者：Fei Pan Chunyi Tong Zhaoyang Wang Fenghua Xu Xiaofei Wang Baicheng Weng Dawei Pan Rilong Zhu 

机构地区：[1]College of Chemistry and Chemical Engineering.Advanced Catalytic Engineering Research Center of the Ministry of Education,Hunan University,Changsha,410082.PR China [2]CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation,Shandong Key Laboratory of Coastal Environmental Processes,Research Center for Coastal Environment Engineering Technology of Shandong Province,Yantai Institute of Coastal Zone Research.Chinese Academy of Sciences.Yantai 264003,PR China [3]University of Chinese Academy of Sciences,Beijing,100049,PR China [4]College of Chemistry and Chemical Engineering,Central South University,Changsha,410083,PR China [5]School of Environmental Science and Engineering,Hubei Polytechnic University,Huangshi,435003,PR China

出　　处：《Journal of Materials Science & Technology》2021年第34期89-95,共7页材料科学技术（英文版）

基　　金：financially supported by the Fundamental Research Funds for the Central Universities(531118010314);Environmental Protection Science and Technology Project of Hunan Province(20190011);Key R&D Program of Hunan Province(2019SK2281)。

摘　　要：Two kinds of novel sulfhydryl functionalized covalent organic frameworks were fabricated as adsorbents for the removal of ultra-trace concentrations of Hg^(2+)from water.The two kinds of sulfhydryl functionalized covalent organic frameworks were obtained via a thiol-ene click reaction between the thiol groups of trithiocyanuric acid(TTC)or bismuththiol(BMT)and vinyl groups on the surface of covalent organic frameworks.The material structure was characterized by XRD,SEM,EDS,FT-IR,BET,and TG analysis.Due to their rich sulfur content,both adsorbents(COF-SH-1 and COF-SH-2)exhibited a high level of selective Hg^(2+)removal from aqueous solution with maximum adsorption capacities of 763.4 mg g^(-1) and526.3 mg g^(-1),respectively.Furthermore,in the presence of ultra-low concentrations of Hg^(2+)both materials exhibited excellent performance,achieving rapid Hg^(2+)removal at concentrations from 10μg L^(-1) to less than 0.02 ng L^(-1).Analysis of the adsorption mechanism indicates that the sulfur containing chelating groups exhibit a strong binding capacity for Hg^(2+).Results show that the structure determines the performance,with the amount of adsorption sites being related to the adsorption capacity.Therefore,as sulfhydryl functionalized covalent organic frameworks contain an abundance of adsorption sites,these materials can effectively achieve the removal of ultra-low trace Hg^(2+)concentrations and have promising future application potential for the environmental detection of heavy metals.

关 键 词：Sulfhydryl-functionalized Covalent organic framework Ultra-trace adsorption Mercury adsorption 

分 类 号：TQ424[化学工程] X52[环境科学与工程—环境工程]