Optimization of Batch Adsorption Study Parameters of Acid Dyes onto Spent Brewery Grains

Universal Journal of Green Chemistry Pub Date : 2024-07-22 DOI:10.37256/ujgc.2220244204

Rukkesh J, G. P

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Abstract

The exploration of economical and nature friendly adsorbents for dye elimination from effluent is a promising area of research, driven by the need for sustainable and economically viable solutions. This work deals with the adsorption features of Acid Blue 25 (AB25) and Acid Green 25 (AG25) dyes from aqueous solutions using spent brewery grains (SBG). After brewing process, the obtained residue consists of spent grains. Optimum conditions for AB25 & AG25 removal were found to be at pH 2, adsorbent dosage as 0.8 and 1 g/L of solution respectively and equilibrium time was found to be 60 mins. In order to adjudicate the adsorption process, analysis was carried out with kinetic and isothermal two parameter and three parameter models. The results were discovered to fit most with the pseudo-second-order (R2 = 0.990) for the kinetics and the Langmuir isotherm (R2 = 0.993) for the adsorption isotherms. The isotherms and kinetics verified that SBG had a high value of adsorption capacity. Experiment results pointed out SBG is one of the best adsorbent that eco-friendly, economical, readily accessible, and efficient on the removal of AB25 and AG25 dyes from aqueous solution.

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废酿酒谷物对酸性染料的批量吸附研究参数优化

由于需要可持续且经济可行的解决方案，因此探索经济环保的吸附剂来去除污水中的染料是一个前景广阔的研究领域。本研究利用酿酒废糟（SBG）研究酸性蓝 25（AB25）和酸性绿 25（AG25）染料在水溶液中的吸附特性。酿酒过程结束后，得到的残留物由废糟组成。研究发现，去除 AB25 和 AG25 的最佳条件是 pH 值为 2，吸附剂用量分别为 0.8 和 1 克/升溶液，平衡时间为 60 分钟。为了判断吸附过程，使用动力学模型、等温线两参数模型和三参数模型进行了分析。结果发现，动力学模型与伪二阶模型（R2 = 0.990）最为吻合，而吸附等温线模型则与朗缪尔等温线（R2 = 0.993）最为吻合。等温线和动力学验证了 SBG 具有较高的吸附容量。实验结果表明，SBG 是一种环保、经济、易得且能有效去除水溶液中 AB25 和 AG25 染料的最佳吸附剂。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Universal Journal of Green Chemistry

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