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基于鏻的离子液体改性混合可回收废物活性炭用于汞（II）的吸附。

Phosphonium-based Ionic Liquid Modified Activated Carbon from Mixed Recyclable Waste for Mercury(II) Uptake.

机构信息

Advanced Materials Research Chair, Chemistry Department P. O. Box 2455, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.

Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.

出版信息

Molecules. 2019 Feb 5;24(3):570. doi: 10.3390/molecules24030570.

DOI:10.3390/molecules24030570
PMID:30764473
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6384760/
Abstract

The contamination of water surfaces by mercury is a dangerous environmental problem due to its toxicity, which leads kidney damage. Activated carbon from mixed recyclable waste modified by phosphonium-based ionic liquid (IL-ACMRW) was therefore prepared and evaluated for Hg(II) remediation. The activated carbon used in this study was prepared from mixed waste, including cardboard, papers and palm wastes as cheap raw materials. The mixed Recyclable Waste Activated Carbon was combined with trihexyl(tetradecyl)phosphonium Bis2,4,4-(trimethylpentyl)phosphinate (Cyphos IL 104) ionic liquid to form an adsorbent with organic-inorganic content, in order to improve the Hg(II) uptake from aqueous solutions. FTIR confirms the presence of P, C=O and OH after this modification. The adsorption process was investigated and the evaluated results showed that the capacity was 124 mg/g at pH 4, with a contact time of 90 min, an adsorbent dose of 0.4 g/L, and a Hg(II) concentration of 50 mg/L. This Hg(II) adsorption capacity is superior than that reported in the literature for modified multiwall carbon nanotubes. The adsorption of Hg(II) on the modified activated carbon from mixed recyclable waste was found to follow the pseudo second-order kinetics model. Isotherms of adsorption were analyzed via Freundlich and Langmuir models. The results indicated that Freundlich is the best model to describe the process, suggesting multilayer adsorption.

摘要

汞对水面的污染是一个危险的环境问题，因为它具有毒性，会导致肾脏损伤。因此，我们制备了一种由混合可回收废物制备的、经过膦基离子液体（IL-ACMRW）改性的活性炭，并对其进行了 Hg(II)修复评估。本研究中使用的活性炭是由纸板、纸张和棕榈废料等廉价原料混合制成的。混合可回收废物活性炭与三己基（十四烷基）膦双（2,4,4-三甲基戊基）亚磷酸酯（Cyphos IL 104）离子液体结合，形成具有有机-无机含量的吸附剂，以提高从水溶液中吸附 Hg(II)的能力。FTIR 证实了这种改性后存在 P、C=O 和 OH。研究了吸附过程，评估结果表明，在 pH 值为 4、接触时间为 90 分钟、吸附剂剂量为 0.4 g/L、Hg(II)浓度为 50 mg/L 的条件下，吸附容量为 124 mg/g。这种 Hg(II)吸附容量优于文献中报道的改性多壁碳纳米管的吸附容量。Hg(II)在混合可回收废物改性活性炭上的吸附被发现遵循准二级动力学模型。吸附等温线通过 Freundlich 和 Langmuir 模型进行分析。结果表明，Freundlich 是描述该过程的最佳模型，表明存在多层吸附。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e8ab/6384760/5ae6f7363ab5/molecules-24-00570-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e8ab/6384760/09a6035af3e0/molecules-24-00570-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e8ab/6384760/5ae6f7363ab5/molecules-24-00570-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e8ab/6384760/09a6035af3e0/molecules-24-00570-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e8ab/6384760/04f801f05483/molecules-24-00570-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e8ab/6384760/56b7c16d111c/molecules-24-00570-g003.jpg
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