Directed coordination of C/N-termini of cyano group in metal hexacyanoferrates to efficient palladium recovery: Enhanced adsorption affinity and selectivity.

IF 7.7 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Environmental Research Pub Date : 2024-12-13 DOI:10.1016/j.envres.2024.120581
Meng Liu, Xiaoping Li, Sijian Liu, Xiaobao Chen, Yu Liu, Lanxuan Wen, Zonghan Huang, Shengjiong Yang, Jinpeng Feng, Yang Chen, Rongzhi Chen
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Abstract

N-termini Cyano group (CN) in metal hexacyanoferrates (MHCF) have been identified as specific-affinity sites for palladium (Pd), but C-termini CN do not effectively serve as Pd adsorption sites due to their stronger bonds with the metal ligands (M), which reduces the activity and density of CN. Herein, the optimization of directional coordination of cyano group C/N-termini by modulating the electronic structure of the M (FeII, CoII, and NiII) in MHCF was investigated to reinforce the Pd recovery. Spectroscopic analyses and DFT calculations revealed that NiHCF exhibited N-site mono-coordination, whereas CoHCF displayed C-site mono-coordination due to spin-exchange interactions, leading to the strengthened N-CoIII bonds and weakened FeII-C bonds. Interestingly, FeHCF maintained N-coordination properties and showed C-coordination as the shift of the d-band center weakened the FeIII-C bonds. Double-coordination of CN resulted in a higher adsorption-capacity and -rate than mono-coordination, which were attributed to its greater CN content and adsorption affinity, respectively. Additionally, all three MHCFs, particularly double-coordination FeHCF, demonstrated excellent selectivity in noble/base metal systems, good resistance to anionic interference, and reusability. The study underscores the pivotal role of M's electronic structure in the CN coordination environment, offering a novel strategy for the directional design of adsorbent sites.

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金属六氰基铁氧体中氰基的 C/N 顶端定向配位以高效回收钯:增强吸附亲和力和选择性。
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来源期刊
Environmental Research
Environmental Research 环境科学-公共卫生、环境卫生与职业卫生
CiteScore
12.60
自引率
8.40%
发文量
2480
审稿时长
4.7 months
期刊介绍: The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.
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