Removal of Mercury (II) ions from aqueous solution by adsorption on Cicer arientinum husk: Equilibrium, Kinetic and Mechanism Studies

Q4 Earth and Planetary Sciences Research Journal of Chemistry and Environment Pub Date : 2023-11-05 DOI:10.25303/2712rjce024030

Ahalya Naidu, Ravishankar Kanamadi, T.V. Ramachandra

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Abstract

In the present work, Bengal gram husk (BGH) of low cost, minimally pretreated and locally available abundant agricultural waste material was used as an adsorbent for removal of Hg2+ from aqueous media. The influence of several parameters like effect of pH, adsorbent dosage, initial metal concentration, contact time and presence of interfering ions were studied through batch adsorption studies. The adsorption models of Langmuir and Freundlich were used for for the calculation of isotherm constants. According to the Langmuir model, the maximum adsorption capacity of BGH for Hg (II) ions was found to be 51.85 mg/g. The presence of interfering ions like Mg, Ca, K and Na did not play a role in the removal of Hg (II) ions. The Hg (II) removal by BGH followed pseudo first order rate kinetics. The FTIR spectra and CHN analysis of BGH showed the presence of CH and CO groups on the surface of BGH, which played a significant role in removal of Hg (II). Desorption studies revealed that about 83% of the dye was desorbed at pH 2. The present work showed that the BGH can be applied to remove Hg (II) from wastewater.

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利用 Cicer arientinum 稻壳的吸附作用去除水溶液中的汞（II）离子：平衡、动力学和机理研究

在本研究中，孟加拉糙米壳（BGH）作为一种吸附剂被用于去除水介质中的 Hg2+，这种吸附剂成本低、预处理量少，而且当地有大量的农业废料。通过批量吸附研究，研究了几个参数的影响，如 pH 值、吸附剂用量、初始金属浓度、接触时间和干扰离子的存在。计算等温线常数时使用了 Langmuir 和 Freundlich 吸附模型。根据 Langmuir 模型，发现 BGH 对 Hg (II) 离子的最大吸附容量为 51.85 mg/g。Mg、Ca、K 和 Na 等干扰离子的存在对去除 Hg (II) 离子没有影响。BGH 对 Hg (II) 的去除遵循伪一阶速率动力学。BGH 的傅立叶变换红外光谱和 CHN 分析表明，BGH 表面存在 CH 和 CO 基团，它们在去除 Hg (II) 方面发挥了重要作用。解吸研究表明，在 pH 值为 2 时，约 83% 的染料被解吸。本研究结果表明，BGH 可用于去除废水中的汞（II）。

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