Synergistic removal mechanism of U(VI) from uranium wastewater by Ca-Al Co-doped phosphate-functionalized chitosan

IF 7.8 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-09-06 DOI:10.1016/j.psep.2025.107818

Yaolong Zhang , Yuanpei Li , Xiankun Zhou , Xu Zhao , Hongqiang Wang , Zhiwu Lei , Qingliang Wang

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引用次数: 0

Abstract

An Ca-Al co-doped phosphate-functionalized chitosan composite remover (CS@CAP) was synthesized using chitosan as the biomass substrate. removal kinetics and thermodynamics analyses indicated that CS@CAP achieves an exceptional theoretical maximum Removal capacity of 2408 mg·g⁻¹ for U(VI) at 298 K and pH 5.0, with chemisorption identified as the dominant mechanism. The spontaneous exothermic of the removal process confirms the superior performance of CS@CAP at ambient or lower temperatures. In simulated wastewater containing multiple competing cations, a distribution coefficient (K_d) of 3.43 × 10⁶ mL·g⁻¹ demonstrated outstanding selectivity for U(VI). Characterization analyses revealed that both phosphate and hydroxyl groups on the chitosan backbone participated in UO₂²⁺ complexation, concurrently facilitating the precipitation of crystalline Ca(UO₂)₂(PO₄)₂·10 H₂O and Al(UO₂)₃(PO₄)₃·10 H₂O. Notably, Ca(OH)₂ and Al(OH)₃ co-doping synergistically enhanced complexation and served as nucleation sites for crystallization. The engineered CS@CAP composite demonstrates significant potential for efficient remediation of uranium-contaminated wastewater through chemisorption- crystallization mechanisms.

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钙铝共掺磷酸盐-功能化壳聚糖协同去除铀废水中铀（VI）的机理

以壳聚糖为生物质底物，合成了钙铝共掺杂磷酸盐功能化壳聚糖复合去除率（CS@CAP）。动力学和热力学分析表明，在298 K和pH 5.0条件下，CS@CAP对U（VI）的理论最大去除率为2408 mg·g−1，化学吸附是主要机理。自发放热的去除过程证实了CS@CAP在环境或较低温度下的优越性能。在含有多种竞争阳离子的模拟废水中，分配系数（Kd）为3.43 × 106 mL·g−1，表明U（VI）具有良好的选择性。表征分析表明，壳聚糖骨架上的磷酸基和羟基都参与了UO22+的络合，同时促进了结晶Ca(UO2)2(PO4)2·10 H2O和Al(UO2)3(PO4)3·10 H2O的沉淀。值得注意的是，Ca(OH)2和Al(OH)3共掺杂可协同增强络合作用，并作为结晶的成核位点。工程CS@CAP复合材料显示出通过化学吸附-结晶机制有效修复铀污染废水的巨大潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.