1. Highly Effective Removal of Metal Cyanide Complexes and Recovery of Palladium Using Quaternary-Ammonium-Functionalized MOFs
- Author
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Ye Qun, Qin Zhang, Shaoshong Jiang, Zhangjie Huang, Muhan Chen, and Lijiang Zhong
- Subjects
palladium cyanide recovery ,Cyanide ,Iron ,Kinetics ,Pharmaceutical Science ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,Ligands ,01 natural sciences ,Article ,Analytical Chemistry ,Metal ,lcsh:QD241-441 ,chemistry.chemical_compound ,Adsorption ,lcsh:Organic chemistry ,Coordination Complexes ,Drug Discovery ,Physical and Theoretical Chemistry ,Metal-Organic Frameworks ,metal cyanide complexes ,Cyanides ,Elution ,removal ,Organic Chemistry ,Cobalt ,metal-organic framework ,Hydrogen-Ion Concentration ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Quaternary Ammonium Compounds ,chemistry ,Chemistry (miscellaneous) ,visual_art ,visual_art.visual_art_medium ,Molecular Medicine ,Thermodynamics ,Metal-organic framework ,Chemical stability ,0210 nano-technology ,Palladium ,Water Pollutants, Chemical ,Nuclear chemistry - Abstract
In this study, quaternary-ammonium-functionalized metal&ndash, organic frameworks (MOFs) Et-N-Cu(BDC-NH2)(DMF), were prepared, characterized, and applied for the highly effective removal of metal cyanide complexes, including Pd(CN)42&minus, Co(CN)63&minus, and Fe(CN)63&minus, Batch studies were carried out, and the maximum adsorption capacities of Pd(II), Co(III), and Fe(III) reached 172.9, 101.0, and 102.6, respectively. Adsorption was rapid, and equilibrium was established within 30 min. Et-N-Cu(BDC-NH2)(DMF) exhibited high thermal and chemical stability. Furthermore, absorbed Pd(CN)42&minus, was selectively recovered by two-step elution. First, Co(CN)63&minus, were eluted with a 1.5 mol L&minus, 1 KCl solution. Elution rates of Co(CN)63&minus, were greater than 98.0%, whereas the elution percentage of Pd(CN)42&minus, was less than 2.0%. Second, >, 97.0% Pd(CN)42&minus, on the loaded MOFs was eluted using a 2.0 mol L&minus, 1 KI solution. The recovery rate of Pd(CN)42&minus, was greater than 91.0% after five testing cycles. Adsorption isotherms, kinetics models, and adsorption thermodynamics of Pd(CN)42&minus, on Et-N-Cu(BDC-NH2) (DMF) were also systematically investigated. The Et-N-Cu(BDC-NH2) (DMF) absorbent exhibited a rapid, excellent ability for the adsorption of metal cyanide complexes.
- Published
- 2018