Thermodynamics and Kinetic Studies for the Adsorption Process of Methyl Orange by Magnetic Activated Carbons

IF 3.5 Q2 ENVIRONMENTAL SCIENCES Air Soil and Water Research Pub Date : 2021-01-01 DOI:10.1177/11786221211013336

Ana Karen Cordova Estrada, Felipe Cordova Lozano, René Alejandro Lara Díaz

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引用次数: 13

Abstract

This study investigates the adsorption behavior of methyl orange (MO) by magnetic activated carbons (MACs) with different ratios of AC: Magnetite from aqueous solution. Batch experiments for MO adsorption were carried out for evaluating the thermodynamics and kinetics parameters onto the MAC adsorbents. Variables such as pH, initial concentration of the dye, contact time, and temperature have been analyzed. The physicochemical characteristics of MACs were analyzed by scanning electron microscopy (SEM), surface area analyzer (BET), and X-ray power diffraction. The results of SEM and BET analysis showed that MAC adsorbents present a porous structure and large surface area, suitable conditions for the adsorption process. The X-ray diffraction patterns of MACs revealed that the adsorbents possess magnetite as magnetic material. Adsorption kinetic studies carried out onto MACs showed that the pseudo-second-order model provides a good description of the kinetic process. The adsorption equilibrium results were well adjusted to the Langmuir isotherm, showing that the maximum adsorption capacity was for MACs with a ratio 3:1 and 2:1 AC/magnetite. Thermodynamic analysis declares that the adsorption process was established as spontaneous, endothermic, and physical adsorption in nature. The results of the this study indicated that MAC adsorbents can be used successfully for eliminating MO from aqueous solution.

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磁性活性炭吸附甲基橙过程的热力学和动力学研究

研究了不同AC:磁铁矿比例的磁性活性炭对甲基橙(MO)的吸附行为。通过批量吸附MO实验，评价了MAC吸附剂的热力学和动力学参数。对pH值、染料初始浓度、接触时间和温度等变量进行了分析。采用扫描电子显微镜(SEM)、比表面积分析仪(BET)和x射线衍射分析了MACs的理化特性。SEM和BET分析结果表明，MAC吸附剂具有多孔结构和较大的表面积，适合吸附过程。MACs的x射线衍射图表明吸附剂具有磁铁矿作为磁性材料。对MACs进行的吸附动力学研究表明，伪二阶模型可以很好地描述动力学过程。吸附平衡结果符合Langmuir等温线，表明AC/磁铁矿比例为3:1和2:1的MACs吸附量最大。热力学分析表明，吸附过程是自然的、吸热的、物理的吸附。本研究结果表明，MAC吸附剂可以成功地用于去除水溶液中的MO。

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来源期刊

Air Soil and Water Research ENVIRONMENTAL SCIENCES-

CiteScore

7.80

自引率

5.30%

发文量

审稿时长

8 weeks

期刊介绍： Air, Soil & Water Research is an open access, peer reviewed international journal covering all areas of research into soil, air and water. The journal looks at each aspect individually, as well as how they interact, with each other and different components of the environment. This includes properties (including physical, chemical, biochemical and biological), analysis, microbiology, chemicals and pollution, consequences for plants and crops, soil hydrology, changes and consequences of change, social issues, and more. The journal welcomes readerships from all fields, but hopes to be particularly profitable to analytical and water chemists and geologists as well as chemical, environmental, petrochemical, water treatment, geophysics and geological engineers. The journal has a multi-disciplinary approach and includes research, results, theory, models, analysis, applications and reviews. Work in lab or field is applicable. Of particular interest are manuscripts relating to environmental concerns. Other possible topics include, but are not limited to: Properties and analysis covering all areas of research into soil, air and water individually as well as how they interact with each other and different components of the environment Soil hydrology and microbiology Changes and consequences of environmental change, chemicals and pollution.