一种新型CeO2@starch纳米复合粒子的合成与评价,用于高效去除有毒的Cr(VI)离子

IF 8 Q1 ENERGY & FUELS
Oluwafikayo O. Jaiyeola , Hamza Annath , Chirangano Mangwandi
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引用次数: 0

摘要

本研究介绍了一种高效纳米复合材料的合成和表征,CeO2@starch,设计用于从水溶液中去除Cr(VI)。通过一系列的实验和分析,我们研究了CeO2@starch通过考虑各种因素,如接触时间、pH水平、初始Cr(VI)浓度和温度,制备纳米复合材料。首先,我们成功地合成了CeO2@starch纳米复合材料,并使用BET、FTIR和SEM分析进行了全面表征。这些表征为纳米复合材料的结构和性能提供了有价值的见解,证实了其作为去除Cr(VI)的有前途的吸附剂的潜力。在我们的实验中,我们观察到CeO2@starch纳米复合材料在水溶液中将Cr(VI)离子还原为Cr(III)方面表现出令人印象深刻的能力。值得注意的是,发现吸附效率在pH 2时达到最大值,并且在接触时间的240分钟内达到平衡。伪一阶方程准确地描述了吸附过程的动力学,显示出较高的相关系数(大于0.99),表明了该模型的可靠性。此外,我们比较了各种吸附等温线模型来描述所获得的数据,包括Freundlich、Sips、Redlich-Peterson、Temkin和Langmuir模型。Langmuir等温线模型显示出最佳拟合,强调Cr(VI)在CeO2@starch纳米复合材料,并证实其与其他模型相比具有优异的性能。纳米复合材料在22℃下的Langmuir吸附容量为48.54mg/g。有趣的是,吸附容量随着温度的升高而增加,这表明吸附过程是吸热的。为了进一步了解吸附的性质,我们进行了热力学分析,揭示了六价铬在CeO2@starch纳米复合材料是自发的,具有化学性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Synthesis and evaluation of a new CeO2@starch nanocomposite particles for efficient removal of toxic Cr(VI) ions

Synthesis and evaluation of a new CeO2@starch nanocomposite particles for efficient removal of toxic Cr(VI) ions

This study presents the synthesis and characterization of a highly effective nanocomposite material, CeO2@starch, designed for the removal of Cr(VI) from aqueous solutions. Through a series of experiments and analyses, we investigated the adsorption efficiency of the CeO2@starch nanocomposite by considering various factors such as contact duration, pH levels, initial Cr(VI) concentration, and temperature. Firstly, we successfully synthesized the CeO2@starch nanocomposite and conducted comprehensive characterizations using BET, FTIR, and SEM analyses. These characterizations provided valuable insights into the structure and properties of the nanocomposite, confirming its potential as a promising adsorbent for Cr(VI) removal. In our experiments, we observed that the CeO2@starch nanocomposite exhibited an impressive capacity for reducing Cr(VI) ions to Cr(III) in aqueous solutions. Notably, the adsorption efficiency was found to be at its maximum at pH 2, and equilibrium was achieved within 240 min of contact time. The kinetics of the adsorption process were accurately described by the pseudo 1st order equation, which displayed a high correlation coefficient (greater than 0.99), indicating the reliability of this model. Furthermore, we compared various adsorption isotherm models to describe the data obtained, including Freundlich, Sips, Redlich-Peterson, Temkin, and Langmuir models. The Langmuir isotherm model demonstrated the best fit, emphasizing the monolayer adsorption of Cr(VI) onto the CeO2@starch nanocomposite and confirming its superior performance compared to other models. The Langmuir adsorption capacity of the nanocomposite material was measured at 22℃ and found to be 48.54 mg/g. Interestingly, the adsorption capacity increased with higher temperatures, suggesting an endothermic adsorption process. To gain further insights into the nature of the adsorption, we performed thermodynamic analysis, revealing that the adsorption of hexavalent Cr onto the CeO2@starch nanocomposite was spontaneous and had a chemical nature.

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来源期刊
Energy nexus
Energy nexus Energy (General), Ecological Modelling, Renewable Energy, Sustainability and the Environment, Water Science and Technology, Agricultural and Biological Sciences (General)
CiteScore
7.70
自引率
0.00%
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0
审稿时长
109 days
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