吡啶季铵Zr-MOFs吸附分离Pd(CN)4^2-  

Adsorption and separation of Pd(CN)4^2- using pyridine quaternary-ammonium-functionalized Zr-MOFs

作　　者：叶群 陈慕涵[1] 谢小光[1] 汤立红 黄章杰[1] YE Qun;CHEN Mu-han;XIE Xiao-guang;TANG Li-hong;HUANG Zhang-jie(School of Chemical Science and Engineering,Yunnan University,Kunming 650091,China)

机构地区：[1]云南大学化学科学与工程学院,云南昆明650091

出　　处：《云南大学学报（自然科学版）》2020年第4期726-732,共7页Journal of Yunnan University(Natural Sciences Edition)

基　　金：国家自然科学基金(51764051,21966032,51264038,);院士自由探索(2020HA005,2021HA005);昆明市科技局科技示范项目(2017-1-S-12305).

摘　　要：Zr-MOFs由于其高比表面积和在水体中的高稳定性,在湿法冶金领域已引起高度关注.论文选择Zr-MOFs作为改性基体材料,通过季铵化反应将季铵活性基团引入Zr-MOFs基体中,构建季铵离子液体吸附剂ZJU-101,用于废水中Pd(CN)4^2-,Co(CN)6^3-和Fe(CN)6^3-的吸附.ZJU-101在中性和弱碱性溶液中具有较高稳定性,吸附性能测试表明,在pH=7.0条件下,ZJU-101对Pd(CN)4^2-的最大吸附容量为126.0 mg·g^-1,季铵基团的引入对吸附能力的提升起到关键作用.两步洗脱法可以将Pd(CN)4^2-从Pd(CN)4^2-,Co(CN)6^3-,Fe(CN)6^3-的混合溶液中进行有效分离.重复实验显示,经5次循环,ZJU-101分离金属氰化物混合液中Pd(Ⅱ)的回收率>93.0%,通过FT-IR、XPS、Zeta电位和静电势图分析,证实了ZJU-101吸附Pd(CN)4^2-的机理是一个阴离子交换过程.Because of its high specific surface area and high stability in water,Zr-MOFs has attracted great attention in the field of hydrometallurgy.In this paper,Zr-MOFs was selected as modified matrix materials.The quaternary ammonium active groups were introduced into Zr-MOFs matrix through quaternary-ammoniumfunctionalized reaction.A quaternary ammonium ionic liquid adsorbent ZJU-101 was constructed for adsorption of Pd(CN)4^2-,Co(CN)6^3-,and Fe(CN)6^3- from wastewater.ZJU-101 has high stability in neutral and weakly alkaline solutions.The adsorption performance test showed that the maximum adsorption capacity of ZJU-101 for Pd(CN)4^2- was 126.0 mg·g^-1 at pH=7.0.Introduced quaternary ammonium groups plays a key role in improving the adsorption capacity.The two-step elution method can efficiently separate Pd(CN)4^2- in the mixture solution containing Pd(CN)4^2-,Co(CN)6^3-,and Fe(CN)6^3-.Repeated experiments showed that after five cycles,ZJU-101 separated Pd(Ⅱ)from metal cyanide mixture solution with a recovery rate over 93.0%.The mechanism of ZJU-101 adsorption Pd(CN)4^2- was confirmed to be an anionexchange process by the analysis of FT-IR,XPS,zeta potentials and the electrostatic potential map.

关 键 词：离子液体吸附剂 季铵化 金属氰化物 分离 钯 机理 

分 类 号：O614.82[理学—无机化学]