Recovery of Palladium(II) from nitric acid medium using a natural resin prepared from persimmon dropped fruits residues

文献类型: 外文期刊

第一作者: Yi, Qingping

作者: Yi, Qingping;Fan, Ruiyi;Zhang, Qinglin;Luo, Zhengrong;Yi, Qingping;Xie, Feng;Zhang, Qinglin;Luo, Zhengrong

作者机构:

关键词: Recovery;Palladium;Biosorption;Persimmon tannin;Nitric acid medium

期刊名称:JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS ( 影响因子:5.876; 五年影响因子:5.294 )

ISSN:

年卷期:

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收录情况: SCI

摘要: A natural resin, named "PPF resin", was prepared by cross-linking persimmon tannin with formaldehyde and employed as adsorbents for selective recovery of Pd(II) from nitric acid medium. Parameters such as acidic media, HNO3 concentration, contact time, initial metal concentration and temperature were investigated in detail. The adsorption behavior followed the typical monolayer type of Langmuir model and the maximum adsorption capacity reached 259.7 mg g(-1) at 323 K. The obtained thermodynamic parameters (Delta G, AH and AS) revealed that this adsorption process was feasible, spontaneous and endothermic process. After adequately characterizing the samples by FT-IR, XRD, XPS and SEM-EDS, the adsorption mechanism was proposed to be complex formation and redox reaction. The Pd(II) recovery from industrial nitric acid extract of printed circuit boards was effective and highly selective, and the loaded Pd(II) can be easily desorbed using acidic thiourea solutions. Therefore, the present results provide a new, low cost and effective approach for palladium recovery from e-wastes in nitric acid medium. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

分类号: TQ

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