Adsorption of methylene blue dye onto bentonite clay: Characterization, adsorption isotherms, and thermodynamics s tudy by using UV-Vis technique

Ahmed Jaber Ibrahim, Haneen Abdul Wahid Dwesh, Ahmed R.Y. Al-Sawad
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Abstract

This study uses the UV-Vis technique to describe the elimination of methylene blue dye from an aqueous solution by adsorption on an Iraqi bentonite clay surface. The batch approach was used to conduct adsorption studies carried out to evaluate the influence of factors of experimental like contact time (0–90 min), clay dose (0.1–0.35 g), and initial dye concentration (10–125 mg L-1) at the range of temperatures (25-40oC). The Langmuir and the Freundlich isotherms were used to analyze the data; the Langmuir isotherm (R2 = 0.998) proved more appropriate for the equilibrium data. The thermodynamic properties of the adsorption process, including Gibbs free energy (ΔGO), entropy(ΔSO), and enthalpy (ΔHO), were also studied. Since the (ΔGO) and (ΔHO) values were negative, it was clear that the adsorption process constituted an exothermic, spontaneous reaction. This investigation revealed that Iraqi bentonite clay effectively removed the dye methylene blue because of its high surface area. Methylene blue may be removed with an adsorption efficiency of up to 99.39 % at 25oC. By employing bentonite clay as an adsorbent surface, this research offers practical adsorption technology that is affordable and effective for treating wastewater.
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膨润土对亚甲基蓝染料的吸附:表征、吸附等温线及紫外-可见热力学研究
本研究使用UV-Vis技术描述了通过在伊拉克膨润土粘土表面吸附去除水溶液中的亚甲基蓝染料。采用间歇式吸附法,在25 ~ 40℃的温度范围内,考察了接触时间(0 ~ 90 min)、粘土用量(0.1 ~ 0.35 g)、初始染料浓度(10 ~ 125 mg L-1)等实验因素对吸附效果的影响。使用Langmuir等温线和Freundlich等温线分析数据;Langmuir等温线(R2 = 0.998)更适合于平衡数据。研究了吸附过程的热力学性质,包括吉布斯自由能(ΔGO)、熵(ΔSO)和焓(ΔHO)。由于(ΔGO)和(ΔHO)的值为负,很明显,吸附过程是一个放热的自发反应。研究表明,伊拉克膨润土因其高表面积而能有效去除染料亚甲基蓝。在25℃条件下,亚甲基蓝的吸附效率可达99.39%。本研究以膨润土为吸附剂表面,为污水处理提供了经济有效的实用吸附技术。
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