Synthesis of a Fe/Ca-based phosphate material and its application for adsorption of uranium ions from aqueous solution

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2021-09-27 DOI:10.1144/geochem2021-052

Haiyan Liu, Weimin Zhang, J. Mo, Zhen Wang, Jiahong Chen, Junhua Chen, Z. Zhuo

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引用次数: 0

Abstract

Uranium (U) ion contamination in aquatic systems has received considerable attention worldwide. In this paper, an adsorption material was synthesized with a Fe/Ca-based phosphate (CFB-PM) by a sol–gel method. The effect of pH, reaction time and initial concentration of U ions on its capacity to remove U ions from aqueous solution was investigated via static batch experiments. Comparative studies of U ion removal by CFB-PM with four sorbents, namely: nano zero-valent iron (nZVI), hydroxyapatite (HAP), hydroxyapatite-loaded nano zero-valent iron (HAP@nZVI) and high basicity steel slag-loaded hydroxyapatite (HBSS@HAP), were performed. Results showed that U ion adsorption capacity of CFB-PM was better than that of all four. The adsorption capacity showed a decreasing order as: CFB-PM (643.34 mg g–1) > HAP (549.86 mg g–1) > HBSS@HAP (321.82 mg g–1) > HAP@nZVI (153.62 mg g–1) > nZVI (102.65 mg g–1). Scanning electron microscopy energy-dispersive spectrometry examination suggested that the adsorbed U ions were mainly in the form of spheres, sheets or petals on the surfaces of CFB-PM. X-ray diffraction revealed several U-bearing mineral phases (i.e. Ca(UO2)2(PO4)2·3H2O, HPUO6·4H2O and (UO2)3PO4·4H2O). The U ion adsorption behaviours were further explored by Fourier transform IR spectroscopy. The U ion adsorption process of CFB-PM could be well described by a quasi-second-order adsorption kinetics model and the Langmuir adsorption isotherm model. The separation coefficient (RL) was close to zero, indicating that U ion adsorption was dominated by single-layer chemisorption. The findings reported in this study have implications for applying the synthesized material for remediation of U ion-contaminated groundwater.

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Fe/ ca基磷酸盐材料的合成及其在水溶液中吸附铀离子中的应用

水系统中的铀离子污染已引起全世界的广泛关注。本文以铁/钙基磷酸盐（CFB-PM）为原料，采用溶胶-凝胶法合成了一种吸附材料。通过静态间歇实验研究了pH、反应时间和U离子初始浓度对其去除水溶液中U离子能力的影响。纳米零价铁（nZVI）、羟基磷灰石（HAP）、羟基磷灰石负载纳米零价铁四种吸附剂对CFB-PM去除U离子的比较研究(HAP@nZVI)和高碱度钢渣负载羟基磷灰石(HBSS@HAP)，进行了。结果表明，CFB-PM对U离子的吸附能力优于四种吸附剂。CFB-PM（643.34 mg g–1） > HAP（549.86 mg g–1） > HBSS@HAP（321.82 mg g–1） > HAP@nZVI（153.62 mg g–1） > nZVI（102.65 mg g–1）。扫描电子显微镜能谱分析表明，CFB-PM表面吸附的U离子主要呈球形、片状或花瓣状。X射线衍射显示了几种含U的矿物相（即Ca（UO2）2（PO4）2·3H2O、HPUO6·4H2O和（UO3）3PO4·4H2O）。利用傅立叶变换红外光谱进一步研究了U离子的吸附行为。用准二阶吸附动力学模型和Langmuir吸附等温线模型可以很好地描述CFB-PM对U离子的吸附过程。分离系数（RL）接近零，表明U离子的吸附以单层化学吸附为主。本研究报告的研究结果对应用合成材料修复U离子污染的地下水具有启示意义。

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

Geochemistry-Exploration Environment Analysis 地学-地球化学与地球物理

CiteScore

3.60

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Geochemistry: Exploration, Environment, Analysis (GEEA) is a co-owned journal of the Geological Society of London and the Association of Applied Geochemists (AAG). GEEA focuses on mineral exploration using geochemistry; related fields also covered include geoanalysis, the development of methods and techniques used to analyse geochemical materials such as rocks, soils, sediments, waters and vegetation, and environmental issues associated with mining and source apportionment. GEEA is well-known for its thematic sets on hot topics and regularly publishes papers from the biennial International Applied Geochemistry Symposium (IAGS). Papers that seek to integrate geological, geochemical and geophysical methods of exploration are particularly welcome, as are those that concern geochemical mapping and those that comprise case histories. Given the many links between exploration and environmental geochemistry, the journal encourages the exchange of concepts and data; in particular, to differentiate various sources of elements. GEEA publishes research articles; discussion papers; book reviews; editorial content and thematic sets.