Investigation of U(VI) and Th(IV) Adsorption Behavior onto El-Zafarana Silica Sand Modified with Metal Oxides

IF 0.5 4区化学 Q4 CHEMISTRY, ANALYTICAL Journal of Water Chemistry and Technology Pub Date : 2023-09-21 DOI:10.3103/S1063455X23050053

O. A. Elhefnawy, A. A. Elabd

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Abstract

El-Zafarana silica sand (ZSS) was modified with ZnO and CuO forming the new adsorbent ZnO−CuO/ZSS for removing U(VI) and Th(VI) from aqueous solutions. The removal process was performed in a series of batch experiments. The prepared adsorbent was characterized using different analysis techniques: scanning electron microscopy/energy-dispersive X-ray (SEM/EDX), X-ray diffraction (XRD), and Fourier-transforms infrared spectroscopy (FTIR). The influence of various parameters: pH, contact time, initial concentration, and temperature, on the adsorption process was studied. Kinetics and isothermal data reveal the chemisorption and the homogenous adsorption process with maximum adsorption capacities of 73.31 and 64.93 mg/g for at pH 6 and 5 for U(VI) and Th(IV), respectively. The thermodynamic parameters (ΔH°, ΔS°, ΔG°) confirm the endothermic nature of the adsorption process. The desorption study was carried out and found that ZnO–CuO/ZSS can effectively recover U(VI) and Th(IV) by 0.01 M HNO₃. The results indicate that ZnO–CuO/ZSS is an efficient adsorbent for U(VI) and Th(IV) from aqueous solutions.

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金属氧化物改性El Zafarana硅砂对U（VI）和Th（IV）吸附行为的研究

用ZnO和CuO对El Zafarana硅砂（ZSS）进行改性，形成新的吸附剂ZnO−CuO/ZSS，用于从水溶液中去除U（VI）和Th（VI）。去除过程是在一系列分批实验中进行的。使用不同的分析技术：扫描电子显微镜/能量色散X射线（SEM/EDX）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）对制备的吸附剂进行了表征。研究了pH、接触时间、初始浓度和温度等参数对吸附过程的影响。动力学和等温数据揭示了化学吸附和均匀吸附过程，在pH 6和5时，U（VI）和Th（IV）的最大吸附容量分别为73.31和64.93mg/g。热力学参数（ΔH°、ΔS°、ΔG°）证实了吸附过程的吸热性质。进行了解吸研究，发现ZnO–CuO/ZSS可以通过0.01M HNO3有效地回收U（VI）和Th（IV）。结果表明，ZnO–CuO/ZSS对水溶液中的U（VI）和Th（IV）是一种有效的吸附剂。

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来源期刊

Journal of Water Chemistry and Technology CHEMISTRY, APPLIED-CHEMISTRY, ANALYTICAL

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>12 weeks

期刊介绍： Journal of Water Chemistry and Technology focuses on water and wastewater treatment, water pollution monitoring, water purification, and similar topics. The journal publishes original scientific theoretical and experimental articles in the following sections: new developments in the science of water; theoretical principles of water treatment and technology; physical chemistry of water treatment processes; analytical water chemistry; analysis of natural and waste waters; water treatment technology and demineralization of water; biological methods of water treatment; and also solicited critical reviews summarizing the latest findings. The journal welcomes manuscripts from all countries in the English or Ukrainian language. All manuscripts are peer-reviewed.