利用低成本天然材料硅藻土对纺织水中孔雀石绿的吸附进行了热力学和动力学研究

IF 1 Q4 ENGINEERING, ENVIRONMENTAL Journal of Environmental Engineering and Science Pub Date : 2022-10-20 DOI:10.1680/jenes.22.00037
M. Hadri, K. Draoui, L. Bounab, M. Hamdaoui, Hikmat Douhri, Imane Kouda, H. Zaitan
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引用次数: 0

摘要

染料污染是工业废水的主要污染之一。在这项研究中,我们研究了摩洛哥硅藻土(DT)作为一种低成本吸附剂来去除这些危险染料之一孔雀石绿(MG)。利用BET、SEM、pHpzc和XRD对硅藻土的性能进行了表征。研究在25°C的温度下,在pH、硅藻土质量和MG浓度的不同水平下进行。并对其平衡、动力学和热力学特性进行了研究。结果表明,硅藻土由一个完整的、几乎圆形的筛网组成,具有许多小的有序孔,使其具有17.36的高比表面积 m2 g−1。发现理想的pH为7,饱和期为90分钟。结果表明,MG的去除率随着pH值的增加和吸附剂质量的增加而相应增加。等温线结果表明,Langmuir模型是最合适的,而单分子层对MG的吸附更好。从Langmuir获得的最大吸附容量约为22.17 mg·g−1,温度为25°C。动力学研究被认为是伪二阶和最合适的模型。他还透露,粒子内扩散并不是唯一的速率控制步骤。热力学数据表明,吸附是吸热的,即在高温下吸附更有利。研究证实了硅藻土作为一种有效的吸附剂和一种廉价的去除有害物质的工艺的适用性。
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Thermodynamic and kinetic studies for the adsorption of malachite green from textile water, using a low-cost natural material, diatomite
Pollution by dyes is one of the main pollution of industrial effluents. In this research we examined Moroccan diatomite (DT) as a low cost adsorbent to remove one of these dangerous dyes, malachite green (MG). BET, SEM, pHpzc and XRD were used to assess the characterization of diatomite. The studies were carried out at different levels, of pH, diatomite mass and MG concentrations, with a temperature of 25°C. Equilibrium, kinetics and thermodynamic characteristics were also studied. Results show that the diatomite consisted of an integrated and nearly circular sieve plate with many small ordered pores, giving it a high specific surface area of 17.36 m2 g−1. The ideal pH was found to be 7, with a saturation period of 90 minutes. The results indicate that MG removal increased accordingly as pH increased and also as adsorbent mass increased. The results of the isotherms showed that the Langmuir model is the most adequate, while the adsorption of MG was better characterized by the monolayer. The maximum adsorption capacity obtained from Langmuir is about 22.17 mg. g−1 at 25°C. Kinetic studies were indicated as the pseudo-second-order and most adequate model. He also revealed that intra-particle diffusion was not the only rate-controlling step. The thermodynamic data concluded that the adsorption was endothermic, i.e., adsorption is more favorable at high temperatures. Research has confirmed the applicability of diatomite as an effective adsorbent and an inexpensive process for removing hazardous materials.
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来源期刊
CiteScore
1.60
自引率
0.00%
发文量
20
审稿时长
12 months
期刊介绍: Journal of Environmental Engineering and Science is an international, peer-reviewed publication providing a forum for the dissemination of environmental research, encouraging interdisciplinary research collaboration to address environmental problems. It addresses all aspects of environmental engineering and applied environmental science, with the exception of noise, radiation and light.
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