Thermally activated recycled pottery waste as a porous aluminosilicate sorbent for efficient Uranium(VI) removal from aqueous systems

IF 2.2 3区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Journal of environmental radioactivity Pub Date : 2026-03-01 Epub Date: 2026-02-24 DOI:10.1016/j.jenvrad.2026.107933

Amir A. Elzoghby , Hager Fahmy , Osama E. Roshdy , Ahmed M. Masoud , Ahmed M. Ismail , Mohamed H. Taha , Saber Ibrahim

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引用次数: 0

Abstract

The sustainable management of radioactive wastewater requires low-cost and eco-friendly materials capable of efficiently removing U(VI) from aqueous systems. In this work, recycled pottery waste, a ubiquitous aluminosilicate by-product, was thermally activated at 550, 650, and 750 °C to produce novel sorbents (RP1–RP3) for U(VI) adsorption. The materials were comprehensively characterized by XRD, SEM–EDS, BET, DLS, zeta potential, and FTIR to elucidate structural and surface modifications induced by calcination. The results revealed a progressive improvement in crystallinity, porosity, and surface charge with temperature, culminating in RP3 (750 °C) exhibiting the highest surface area (34.35 m² g⁻¹) and most negative zeta potential (−38.46 mV). Batch adsorption studies demonstrated that U(VI) removal strongly depended on pH, sorbent dose, and contact time, with optimal uptake achieved at pH ≈ 4. The adsorption followed pseudo-second-order kinetics and was best fitted by the Langmuir and Sips isotherm models, confirming monolayer chemisorption on homogeneous active sites. The maximum adsorption capacities reached 49.5 mg g⁻¹ for RP3, while thermodynamic parameters indicated a spontaneous, endothermic, and entropy-driven process. Mechanistic interpretation supported a multi-step pathway involving electrostatic attraction, surface complexation, and intraparticle diffusion. RP3 exhibited excellent reusability, maintaining >87% adsorption efficiency after five cycles using H₂SO₄ as an effective desorbing agent. When tested with real radioactive wastewater, RP3 achieved a 74.2% U(VI) removal efficiency despite competing ions, confirming its high selectivity and structural stability. This study establishes thermally activated recycled pottery as a cost-effective, reusable, and environmentally sustainable sorbent for uranium (VI) remediation, integrating waste valorization with Radioprotection.

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热活化的回收陶瓷废料作为多孔铝硅酸盐吸附剂，用于有效地从水系统中去除铀（VI）。

放射性废水的可持续管理需要能够有效地从水系统中去除U（VI）的低成本和环保材料。在这项工作中，回收陶瓷废料是一种普遍存在的铝硅酸盐副产物，在550、650和750°C下进行热活化，以产生新型吸附剂（RP1-RP3）来吸附U（VI）。采用XRD、SEM-EDS、BET、DLS、zeta电位和FTIR等手段对材料进行了综合表征，以阐明煅烧引起的结构和表面修饰。结果表明，随着温度的升高，RP3的结晶度、孔隙度和表面电荷逐渐增加，其中RP3（750℃）的表面积最大（34.35 m2 g-1）， zeta电位最大（-38.46 mV）。批量吸附研究表明，U（VI）的去除强烈依赖于pH、吸附剂剂量和接触时间，在pH≈4时达到最佳吸收率。吸附遵循准二级动力学，Langmuir和Sips等温模型拟合最佳，证实了均匀活性位点上的单层化学吸附。RP3的最大吸附量为49.5 mg g-1，热力学参数表明这是一个自发、吸热、熵驱动的过程。机械解释支持包括静电吸引、表面络合和粒子内扩散在内的多步骤途径。RP3表现出良好的可重复使用性，在H2SO4作为有效解吸剂的情况下，经过5次循环后，RP3的吸附效率仍保持在80%以上。在实际放射性废水中进行测试，尽管存在竞争离子，但RP3的U（VI）去除率达到74.2%，证实了其高选择性和结构稳定性。本研究建立了热活化再生陶瓷作为一种经济、可重复使用、环境可持续的铀（VI）修复吸附剂，将废物增值与放射性防护相结合。

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来源期刊

Journal of environmental radioactivity 环境科学-环境科学

CiteScore

4.70

自引率

13.00%

发文量

209

审稿时长

73 days

期刊介绍： The Journal of Environmental Radioactivity provides a coherent international forum for publication of original research or review papers on any aspect of the occurrence of radioactivity in natural systems. Relevant subject areas range from applications of environmental radionuclides as mechanistic or timescale tracers of natural processes to assessments of the radioecological or radiological effects of ambient radioactivity. Papers deal with naturally occurring nuclides or with those created and released by man through nuclear weapons manufacture and testing, energy production, fuel-cycle technology, etc. Reports on radioactivity in the oceans, sediments, rivers, lakes, groundwaters, soils, atmosphere and all divisions of the biosphere are welcomed, but these should not simply be of a monitoring nature unless the data are particularly innovative.