缺陷型巯基功能化MOF的制备及其重金属离子吸附性能  

Preparing Defective Thiol-functionalized MOF for the Removal of Heavy Metal Ions

作　　者：谢林华[1] 刘玉辉 李茹霞 吕佳澳 谢亚勃[1] 李建荣[1] XIE Linhua;LIU Yuhui;LI Ruxia;LU Jiaao;XIE Yabo;LI Jianrong(Faculty of Environment and Life,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学环境与生命学部,北京100124

出　　处：《北京工业大学学报》2024年第10期1151-1161,共11页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(22225803,22038001);北京市自然科学基金资助项目(2202001)。

摘　　要：水中的重金属离子对人体伤害巨大,特别是Pb(Ⅱ)和Hg(Ⅱ)离子,因此需要去除Pb(Ⅱ)和Hg(Ⅱ)离子。通过调节合成过程中浓盐酸的用量,合成了具有不同缺陷程度的巯基功能化锆基金属有机框架(zirconium-based metal-organic frameworks, Zr-MOF)材料,简称UiO-66-(SH)_2,并将其用于液相中Pb(Ⅱ)和Hg(Ⅱ)离子的吸附去除。通过UiO-66-(SH)_2对Pb(Ⅱ)和Hg(Ⅱ)离子的吸附实验,发现随着制备过程中盐酸用量的增大,MOF的缺陷程度升高,其对Pb(Ⅱ)和Hg(Ⅱ)离子的吸附能力也有所增强。缺陷型UiO-66-(SH)_2对较低质量浓度的Pb(Ⅱ)(50 mg/L)和Hg(Ⅱ)(70 mg/L)离子的最大吸附量分别可达45和259 mg/g,且对这2种重金属离子具有较好的吸附选择性。经过3次循环吸附后,缺陷型UiO-66-(SH)_2对Pb(Ⅱ)和Hg(Ⅱ)离子的吸附能力没有明显下降,表明该材料在水中重金属离子去除应用上具有一定的潜力。Heavy metal ions in water are harmful to human body,especially Pb(Ⅱ)and Hg(Ⅱ)ions,therefore,it is necessary to remove Pb(Ⅱ)and Hg(Ⅱ)ions.By adjusting the amount of concentrated hydrochloric acid used in the synthesis process,defective mercapto-functionalized zirconium-based metal-organic frameworks(Zr-MOFs)UiO-66-(SH)2 were synthesized and used for the removal of Pb(Ⅱ)and Hg(Ⅱ)ions from their aqueous solutions.Through adsorption experiments of the heavy metal ions,it is found that UiO-66-(SH)2 showed more defects when more hydrochloric acid was introduced in its synthesis,and enhanced adsorption capacity for Pb(域)and Hg(域)ions.The defective UiO-66-(SH)2 exhibited maximum adsorption capacities of 45.11 and 258.75 mg/g for low-concentration Pb(域)and Hg(Ⅱ)ions(50-70 mg/L)with high adsorption selectivity over many other ions,respectively.After three adsorption-desorption cycles,no obvious decrease in the adsorption capacity of the defective UiO-66-(SH)2 for Pb(Ⅱ)and Hg(Ⅱ)ions was observed,indicating a high potential of this material in the removal of heavy metal ions from water.

关 键 词：金属有机框架(MOF) 缺陷 重金属 吸附 汞离子 铅离子 

分 类 号：X703[环境科学与工程—环境工程] TQ02[化学工程]