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用于从矿石浸出液中选择性吸附钯（II）的异戊基硫化物浸渍纳米二氧化锰

Isopentyl-Sulfide-Impregnated Nano-MnO₂ for the Selective Sorption of Pd(II) from the Leaching Liquor of Ores.

作者信息

Wu Shengjie, Xie Mingjin, Zhang Qin, Zhong Lijiang, Chen Muhan, Huang Zhangjie

机构信息

School of Chemistry Science and Engineering, Yunnan University, Cuihu North Road No. 2, Kunming 650091, China.

出版信息

Molecules. 2017 Jul 6;22(7):1117. doi: 10.3390/molecules22071117.

DOI:10.3390/molecules22071117
PMID:28684696
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6152070/
Abstract

Conventional separation methods are not suitable for recovering palladium present in low concentrations in ore leaching solutions. In this study, a novel isopentyl sulfide (S)-impregnated α-MnO₂ nanorod adsorbent (BISIN) was prepared, characterized, and applied for the selective adsorption and separation of palladium from the leaching liquor of ores. Batch studies were carried out, and the main adsorption parameters were systematically investigated, in addition to the relevant thermodynamic parameters, isotherms, and kinetic models. The thermodynamic parameters reflected the endothermic and spontaneous nature of the adsorption. Moreover, the experimental results indicated that the Langmuir isotherm model fits the palladium adsorption data well and the adsorption was well described by the pseudo-second-order kinetic model. The main adsorption mechanisms of palladium were elucidated at the molecular level by X-ray crystal structure analysis. Thiourea was found to be an excellent desorption agent, and the palladium-thiourea complex was also confirmed by X-ray crystal structure analysis. The results indicated that almost all of the Pd(II) (>99.0%) is adsorbed on BISIN, whereas less than 2% of the adsorbed Pt(IV), Fe, Cu, Ni, and Co is observed under the optimum conditions. The proposed method can be used for the efficient adsorption and separation of palladium from the leaching liquor of ores.

摘要

传统的分离方法不适用于回收矿石浸出液中低浓度存在的钯。在本研究中，制备了一种新型的硫化异戊酯（S）浸渍的α-MnO₂纳米棒吸附剂（BISIN），对其进行了表征，并将其用于从矿石浸出液中选择性吸附和分离钯。进行了批量研究，除了相关的热力学参数、等温线和动力学模型外，还系统地研究了主要吸附参数。热力学参数反映了吸附的吸热和自发性质。此外，实验结果表明，Langmuir等温线模型很好地拟合了钯吸附数据，吸附过程可用准二级动力学模型很好地描述。通过X射线晶体结构分析在分子水平上阐明了钯的主要吸附机制。发现硫脲是一种优良的解吸剂，并且通过X射线晶体结构分析也证实了钯-硫脲络合物的存在。结果表明，在最佳条件下，几乎所有的Pd（II）（>99.0%）都吸附在BISIN上，而吸附的Pt（IV）、Fe、Cu、Ni和Co中观察到的不到2%。所提出的方法可用于从矿石浸出液中高效吸附和分离钯。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/da42b550804e/molecules-22-01117-g013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/a78e01c0697c/molecules-22-01117-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/1e967a160baf/molecules-22-01117-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/65db050d7f33/molecules-22-01117-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/93a0de07e0ae/molecules-22-01117-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/1d5b172da495/molecules-22-01117-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/da42b550804e/molecules-22-01117-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/0bb4f552d79f/molecules-22-01117-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/954d57bf2f8d/molecules-22-01117-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/26e2a8f7da7d/molecules-22-01117-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/0392776039b4/molecules-22-01117-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/7f09d1e215e3/molecules-22-01117-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/80c3efd3f492/molecules-22-01117-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/14daf484f3e4/molecules-22-01117-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/a78e01c0697c/molecules-22-01117-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/1e967a160baf/molecules-22-01117-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/65db050d7f33/molecules-22-01117-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/93a0de07e0ae/molecules-22-01117-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/1d5b172da495/molecules-22-01117-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/472c/6152070/da42b550804e/molecules-22-01117-g013.jpg

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