Effect of nano bentonite on direct yellow 50 dye removal; Adsorption isotherm, kinetic analysis, and thermodynamic behavior

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Progress in Reaction Kinetics and Mechanism Pub Date : 2022-01-01 DOI:10.1177/14686783221090377
A. Mahmoud
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引用次数: 6

Abstract

Developing countries suffering from the toxicity of different industrial effluents especially dyes. This study successfully prepared and characterized nano-bentonite for anionic dye removal (DY 50). The prepared nanoparticles were characterized by X-Ray Diffraction (XRD), X-ray Fluorescence (XRF), Scanning Electron Microscope (SEM), EDAX analysis, FT-IR, and TGA and the obtained results indicated the formation of nanoparticles with an average size of 15 nm. The effect of different operating conditions was studied using different pH, dose, contact time, temperature, and initial DY 50 concentrations. The obtained results indicated that nano bentonite was able to adsorb about 78.3 and 100% for initial concentrations of 100±8.1 and 20 ±1.62 mg/L, respectively. The optimum removal conditions were observed at acidic media (pH 3) using sorbent material dosage 1 g/L for 45 min and 30°C. The adsorption isotherm, kinetic analysis, and thermodynamic behavior were studied by using linear equation form, and the adjusted R2 was compared to detect the preferred models. The adsorption isotherm indicated that heterogeneous, as well as multilayer adsorption, plays an important role in the removal of dye. Kinetic studies indicated the chemisorption interaction between sorbed and adsorbed molecules. Thermodynamic behavior indicated the reaction is exothermic with ∆H equal to −5.24 KJ/mol and ∆S equal −74.2 J/K.mol. Finally, this study strongly recommended using nano bentonite for DY 50 removal from an aqueous solution. The RSM relations show significant relations in all removal models with p-value <0.001. The ANN results indicated that the most effective operating conditions are the effect of nano bentonite dose followed by the pH effect.
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纳米膨润土对黄50染料直接脱除的影响吸附等温线,动力学分析和热力学行为
发展中国家遭受各种工业废水特别是染料的毒性之害。本研究成功制备了用于去除阴离子染料的纳米膨润土(dy50),并对其进行了表征。通过x射线衍射(XRD)、x射线荧光(XRF)、扫描电镜(SEM)、EDAX分析、FT-IR和TGA等手段对所制备的纳米颗粒进行了表征,结果表明所制备的纳米颗粒平均尺寸为15 nm。通过不同的pH、剂量、接触时间、温度和初始dy50浓度,研究了不同操作条件的影响。结果表明,在初始浓度为100±8.1 mg/L和20±1.62 mg/L时,纳米膨润土的吸附率分别为78.3和100%。在酸性介质(pH 3)下,吸附剂用量为1 g/L,时间为45 min,温度为30℃,观察了最佳去除条件。采用线性方程形式对吸附等温线、动力学分析和热力学行为进行了研究,并对调整后的R2进行了比较,以确定优选模型。吸附等温线表明,多相吸附和多层吸附在染料脱除中起重要作用。动力学研究表明,吸附和吸附分子之间存在化学吸附作用。热力学行为表明该反应为放热反应,∆H为−5.24 KJ/mol,∆S为−74.2 J/K.mol。最后,本研究强烈推荐使用纳米膨润土从水溶液中去除dy50。RSM关系在所有去除模型中显示显著关系,p值<0.001。人工神经网络结果表明,最有效的操作条件是纳米膨润土剂量的影响,其次是pH的影响。
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来源期刊
CiteScore
2.10
自引率
0.00%
发文量
5
审稿时长
2.3 months
期刊介绍: The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.
期刊最新文献
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