Lead Ion Adsorption on Glutathione-Modified Carbon

IF 2.8 4区工程技术 Q2 ENGINEERING, CHEMICAL

Processes Pub Date : 2024-09-13 DOI:10.3390/pr12091972

Namasivayam Selvanantharajah, Poobalasuntharam Iyngaran, Poobalasingam Abiman, Navaratnarajah Kuganathan

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Abstract

This study explores the adsorption of Pb(II) from aqueous solutions using glutathione-modified carbon powder at room temperature. The graphite powder was modified through oxidation followed by surface immobilization of glutathione. The Pb(II) concentration was measured using square wave anodic stripping voltammetry (SWASV). Experiments were conducted with the following varying initial Pb(II) ion concentrations: 20.72 mg L−1, 41.44 mg L−1, 62.16 mg L−1, 82.88 mg L−1, 103.60 mg L−1, and 124.32 mg L−1. The effect of varying the glutathione-modified carbon powder dosage (12.5 mg, 25.0 mg, 50.0 mg, 75.0 mg, and 100.0 mg) on Pb(II) uptake was studied. The adsorption data were modeled using the Freundlich isotherm, resulting in a regression coefficient (R2) of 0.96, which signifies a good fit. The Freundlich constants obtained were KF = 3.54 × 10−5 (adsorption capacity) and n = 1.56 (adsorption intensity). At optimal conditions (10.0 mL of 20.72 mg L−1 Pb(II) solution with 100.0 mg of glutathione-modified carbon powder), the adsorption efficiency was 96.3%. The glutathione-modified carbon powder exhibits a high capacity for adsorbing Pb(II) from aqueous solutions.

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谷胱甘肽改性碳对铅离子的吸附作用

本研究探讨了谷胱甘肽改性碳粉在室温下对水溶液中铅（II）的吸附。先对石墨粉进行氧化改性，然后在其表面固定谷胱甘肽。采用方波阳极剥离伏安法（SWASV）测量铅（II）的浓度。实验在以下不同的初始铅（II）离子浓度下进行：20.72 毫克/升、41.44 毫克/升、62.16 毫克/升、82.88 毫克/升、103.60 毫克/升和 124.32 毫克/升。研究了改变谷胱甘肽改性碳粉用量（12.5 毫克、25.0 毫克、50.0 毫克、75.0 毫克和 100.0 毫克）对铅（II）吸收的影响。采用 Freundlich 等温线建立了吸附数据模型，得出的回归系数 (R2) 为 0.96，表明拟合效果良好。得到的 Freundlich 常数为 KF = 3.54 × 10-5（吸附容量）和 n = 1.56（吸附强度）。在最佳条件下（10.0 mL 20.72 mg L-1 Pb(II) 溶液与 100.0 mg 谷胱甘肽改性碳粉），吸附效率为 96.3%。谷胱甘肽改性碳粉对水溶液中的铅(II)具有很高的吸附能力。

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来源期刊

Processes Chemical Engineering-Bioengineering

CiteScore

5.10

自引率

11.40%

发文量

2239

审稿时长

14.11 days

期刊介绍： Processes (ISSN 2227-9717) provides an advanced forum for process related research in chemistry, biology and allied engineering fields. The journal publishes regular research papers, communications, letters, short notes and reviews. Our aim is to encourage researchers to publish their experimental, theoretical and computational results in as much detail as necessary. There is no restriction on paper length or number of figures and tables.