Efficient removal of U(VI) from aqueous solution by hydroxyapatite/graphene oxide composite microspheres

IF 1.4 3区 化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochimica Acta Pub Date : 2023-11-17 DOI:10.1515/ract-2023-0235
Wenjun Wu, Jianlong Wang
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Abstract

Effective treatment of uranium-containing wastewater is of great significance to the sustainable development of nuclear power and the protection of ecological environment. In this study, a highly efficient uranium adsorbent, graphene oxide (GO)/nano-hydroxyapatite (nHA) composite microspheres (nHA@rGO) was synthesized, which could effectively remove uranium from aqueous solution. Under the condition of pH = 3.5, T = 298 K, the maximum adsorption capacity reached 1672.96 mg/g. The results of batch experiments showed that the adsorption capacity of nHA@rGO microspheres was higher than that of nHA microspheres, indicating the enhancement of GO. The adsorption kinetics conformed to the pseudo second-order model. The changes of nHA@rGO microspheres before and after uranium adsorption were analyzed by FT-IR, XPS and XRD. The mechanisms of U(VI) ions adsorption onto nHA@rGO microspheres involved precipitation, surface complexation and ion exchange, in which the hydroxyl and phosphoric acid groups played important roles. The results showed that the prepared nHA@rGO microspheres can be used as an efficient and promising adsorbent for the treatment of uranium-containing wastewater.
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羟基磷灰石/氧化石墨烯复合微球高效去除水溶液中的U(VI
有效处理含铀废水对核电的可持续发展和生态环境保护具有重要意义。本研究合成了一种高效的铀吸附剂——氧化石墨烯(GO)/纳米羟基磷灰石(nHA)复合微球(nHA@rGO),可以有效地去除水溶液中的铀。在pH = 3.5, T = 298 K条件下,吸附量最大可达1672.96 mg/g。批量实验结果表明,nHA@rGO微球的吸附量高于nHA微球,表明氧化石墨烯的增强作用。吸附动力学符合准二级模型。利用FT-IR、XPS和XRD分析了nHA@rGO微球吸附铀前后的变化。nHA@rGO微球吸附U(VI)离子的机理包括沉淀、表面络合和离子交换,其中羟基和磷酸基团起重要作用。结果表明,制备的nHA@rGO微球可作为一种高效的含铀废水吸附剂。
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来源期刊
Radiochimica Acta
Radiochimica Acta 化学-核科学技术
CiteScore
2.90
自引率
16.70%
发文量
78
审稿时长
6 months
期刊介绍: Radiochimica Acta publishes manuscripts encompassing chemical aspects of nuclear science and technology.
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