Adsorption of malachite green on to poplar sawdust activated carbon

IF 2.3 4区工程技术 Q3 CHEMISTRY, MULTIDISCIPLINARY Separation Science and Technology Pub Date : 2023-08-13 DOI:10.1080/01496395.2023.2240492

Derya Yıldız, Izge Demir, H. Demiral

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引用次数: 1

Abstract

ABSTRACT Dye pollution is a very important problem that needs to be prevented due to its effects on ecosystem, human and animal health. Adsorption is an economical and easy treatment method used to remove these pollutants. Today, activated carbons, which are tried to be produced from renewable resources, are widely used adsorbents thanks to its low cost and advanced surface properties. The activated carbon (AC) in this study was produced from poplar sawdust by H3PO4 activation at an acid:sawdust ratio of 4:1 and a carbonization temperature of 400°C. This AC was used to adsorption of Malachite Green (MG) from aqueous solutions. According to the experimental results, the optimum adsorption conditions were determined as 6 h at pH 5 and 25°C with 0.1 g adsorbent at 300 mg/L initial concentration and 150 mg/g adsorption capacity was achieved these conditions. Adsorption kinetics, isotherms and thermodynamics were also investigated and the results were evaluated. Surface adsorption and intraparticle diffusion are effective in the adsorption mechanism of MG on poplar sawdust AC. Since the kinetic data fit the pseudo-second-order model, it can be said that the adsorption is chemisorption. Moreover, MG adsorption was spontaneous and endothermic on a monolayer homogeneous surface.

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杨木木屑活性炭对孔雀石绿的吸附性能

摘要染料污染是一个非常重要的问题，由于它对生态系统、人类和动物健康的影响，需要预防。吸附法是一种经济、简便的处理方法。目前，活性炭以其低廉的成本和先进的表面性能成为广泛使用的吸附剂，并试图从可再生资源中生产活性炭。以杨木木屑为原料，在酸与木屑比为4:1、炭化温度为400℃的条件下，采用H3PO4活化制备活性炭(AC)。该活性炭用于吸附孔雀石绿(MG)。根据实验结果，确定了最佳吸附条件为:在pH 5、25℃条件下，吸附剂浓度为0.1 g，初始浓度为300 mg/L，吸附时间为6 h，吸附量为150 mg/g。研究了吸附动力学、等温线和热力学，并对结果进行了评价。MG在杨木木屑AC上的吸附机理是表面吸附和颗粒内扩散，动力学数据符合拟二阶模型，可认为吸附为化学吸附。此外，MG在单层均匀表面上的吸附是自发和吸热的。

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来源期刊

Separation Science and Technology 工程技术-工程：化工

CiteScore

6.10

自引率

3.60%

发文量

131

审稿时长

5.7 months

期刊介绍： This international journal deals with fundamental and applied aspects of separation processes related to a number of fields. A wide range of topics are covered in the journal including adsorption, membranes, extraction, distillation, absorption, centrifugation, crystallization, precipitation, reactive separations, hybrid processes, continuous separations, carbon capture, flocculation and magnetic separations. The journal focuses on state of the art preparative separations and theoretical contributions to the field of separation science. Applications include environmental, energy, water, and biotechnology. The journal does not publish analytical separation papers unless they contain new fundamental contributions to the field of separation science.