Efficient adsorptive removal of two anionic dyes (methyl orange and methyl red) with MOF-525: Adsorption isotherms and kinetics studies

IF 2.1 4区 环境科学与生态学 Q3 ENGINEERING, CHEMICAL
Wenbin Hu, Qiang Yang, Renjuan Wang, Qi Chen, Yun Kong
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Abstract

Adsorption is widely used to remove anionic and cationic dyes from wastewater because of its economical and high efficiency. Metal-organic frameworks (MOFs), as a kind of adsorbent, have attracted great attention due to the large surface area, adjustable pore size, and high stability. In this study, a Zr-MOF, named MOF-525, was synthesized by using solvothermal method, and the adsorption performances of MOF-525 on two anionic dyes (methyl orange, MO and methyl red, MR) were investigated. Results showed that the obtained MOF-525, with the specific surface area of 2,613.91 m2 g−1, the total pore volume of 1.20 cm3 g−1, and the average pore size of 1.84 nm, exhibited high adsorption capacities for both MO and MR. The optimal pH value for MO and MR adsorption were 3.0 and 4.0, with the adsorption capacity of 854.30 and 629.67 mg g−1, respectively; in addition, the adsorption capacities for both MR and MO were increased with the increasing of SO42− concentration. The adsorption kinetics, isotherms, and thermodynamics results indicated the pseudo-second-order model and Langmuir (as well as Freundlich) could describe the adsorption processes of MOF-525 well, and the adsorption processes for both MO and MR were spontaneous exothermic reactions. Besides, the reusability experiment demonstrated that MOF-525 had significant adsorption capacity and good reusability for MR. In conclusion, the possible adsorption mechanisms of anionic dyes by MOF-525 involved hydrogen bonding, electrostatic attraction, and π-π interaction. These results illustrated that MOF-525 might be a potential adsorption material for anionic dyes removal from wastewater.

MOF-525 对两种阴离子染料(甲基橙和甲基红)的高效吸附去除:吸附等温线和动力学研究
吸附法以其经济、高效的优点被广泛应用于废水中阴离子和阳离子染料的去除。金属有机骨架(MOFs)作为一种吸附剂,因其具有比表面积大、孔径可调、稳定性高等优点而备受关注。本研究采用溶剂热法合成了一种Zr-MOF,命名为MOF-525,并研究了MOF-525对两种阴离子染料(甲基橙,MO和甲基红,MR)的吸附性能。结果表明,MOF-525的比表面积为2613.91 m2 g−1,总孔容为1.20 cm3 g−1,平均孔径为1.84 nm,对MO和MR均具有较高的吸附能力,MO和MR的最佳吸附pH分别为3.0和4.0,吸附量分别为854.30和629.67 mg g−1;此外,随着SO42−浓度的增加,对MR和MO的吸附量均有所增加。吸附动力学、等温线和热力学结果表明,拟二阶模型和Langmuir(以及Freundlich)可以很好地描述MOF-525的吸附过程,MO和MR的吸附过程均为自发放热反应。MOF-525对阴离子染料具有明显的吸附能力和良好的可重复使用性。因此,MOF-525对阴离子染料的吸附机制可能包括氢键、静电吸引和π-π相互作用。这些结果表明MOF-525可能是一种潜在的去除废水中阴离子染料的吸附材料。
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来源期刊
Environmental Progress & Sustainable Energy
Environmental Progress & Sustainable Energy 环境科学-工程:化工
CiteScore
5.00
自引率
3.60%
发文量
231
审稿时长
4.3 months
期刊介绍: Environmental Progress , a quarterly publication of the American Institute of Chemical Engineers, reports on critical issues like remediation and treatment of solid or aqueous wastes, air pollution, sustainability, and sustainable energy. Each issue helps chemical engineers (and those in related fields) stay on top of technological advances in all areas associated with the environment through feature articles, updates, book and software reviews, and editorials.
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