Methylene Blue Dye Adsorption onto Polyoxometalate Ionic Liquid Supported on Bentonite: Kinetic, Equilibrium and Thermodynamic Studies

物理化学期刊(英文) Pub Date : 2021-03-25 DOI:10.4236/OJPC.2021.112006

Norah S. Alsubaie, Rawan M. Alshamrani, D. Domyati, Nadiayh Alahmadi, F. Bannani

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引用次数: 4

Abstract

The potential of polyoxometalate ionic liquid POM-IL supported on low-cost and available eco-friendly Saudi raw bentonite in the adsorption of MB cationic dye was investigated. For this purpose, TOAx[α-XW11O39]@Bentonite (X = Si, P; TOA = TetraOctylAmmonium), namely SWB and PWB were prepared and characterized by IR, XRD, XRF, SEM, TEM and BET. Batch adsorption experiments showed that SWB and PWB have higher adsorption capacity than the raw bentonite with an enhancement of about 37% for SWB. The adsorption capacities of both SWB and PWB improved with increasing contact time and temperature and decreased with higher salt concentration in solution. The pH is shown to have insignificant effect on the adsorption of MB onto SWB and PWB. This result is quite meaningful in the adsorption process application since it makes pH complicated adjustment of the discharged contaminated water before treatment unnecessary. The Kinetic study expressed that the pseudo-second-order model described the adsorption process better than the pseudo first order. The experimental isotherm data were found to fit the Langmuir model compared to the Freundlich model with a maximum adsorption capacity 277.78 mg/g and 113.6 for PWB and SWB respectively. The thermodynamic parameters illustrated that the adsorption process was favorable, spontaneous and endothermic.

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膨润土负载多金属氧基离子液体吸附亚甲基蓝染料的动力学、平衡和热力学研究

研究了以低成本、环保的沙特膨润土为载体的多金属氧酸盐离子液体POM-IL对MB阳离子染料的吸附潜力。为此，制备了TOAx[α-XW11O39]膨润土（X=Si，P；TOA=TetraOctylAmmonium），即SWB和PWB，并通过IR、XRD、XRF、SEM、TEM和BET进行了表征。SWB和PWB的吸附能力随着接触时间和温度的增加而提高，随着溶液中盐浓度的增加而降低。pH对MB在SWB和PWB上的吸附没有显著影响。这一结果在吸附工艺的应用中非常有意义，因为它使处理前排放的污水的pH值的复杂调节变得不必要。动力学研究表明，拟二阶模型比拟一阶模型更好地描述了吸附过程。实验等温线数据与Freundlich模型相比符合Langmuir模型，PWB和SWB的最大吸附量分别为277.78mg/g和113.6。热力学参数表明，吸附过程是有利的、自发的和吸热的。

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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物理化学期刊(英文)

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