Synthesis of carbon nitride in potassium hydroxide molten salt for efficient uranium extraction from radioactive wastewater

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL Frontiers of Environmental Science & Engineering Pub Date : 2024-06-12 DOI:10.1007/s11783-024-1859-5
Shuang Liu, Junhan Luo, Daniel-James Maguire, Liyuan Zheng, Zhe Wang, Yuexiang Lu
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Abstract

Photocatalysis-assisted removal of uranium has been proven as an effective method for the elimination of radioactive pollution from wastewater. In this work, carbon nitride materials were synthesized in potassium hydroxide (KOH) molten salt and applied to photocatalytic uranyl extraction. Obtained materials were confirmed to possess the triazine-s-heptazine structure by NMR, XPS and UV-Vis characterization, and exhibited a wider visible light absorption than graphitic carbon nitride (g-C3N4). The photocatalytic activity of the carbon nitride materials was tailored by varying the precursor mass fractions. The carbon nitride obtained at 80% melamine as precursor (K-CN-80) exhibited the highest photocatalytic extraction ability and its photocatalytic reaction rate is 6.6 times faster than that of g-C3N4. The influence of sacrificial agents was studied and the results showed that triethanolamine inhibited U(VI) photoreduction, but methanol can accelerate U(VI) photoreduction by consuming photogenerated holes. This unary KOH molten salt synthesis method has exceptional potential applications in the preparation of carbon nitrides, and the obtained products showed potential in extracting U(VI) from aqueous solutions for use in nuclear fuel industry and for U(VI) environmental pollution cleanup.

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在氢氧化钾熔盐中合成氮化碳,以便从放射性废水中高效提取铀
光催化辅助去除铀已被证明是消除废水中放射性污染的有效方法。本研究在氢氧化钾(KOH)熔盐中合成了氮化碳材料,并将其应用于光催化铀萃取。通过核磁共振、XPS 和紫外可见光表征,证实所获得的材料具有三嗪-庚嗪结构,并且比石墨氮化碳(g-C3N4)具有更宽的可见光吸收率。氮化碳材料的光催化活性可通过改变前驱体的质量分数来定制。以 80% 的三聚氰胺为前驱体得到的氮化碳(K-CN-80)表现出最高的光催化萃取能力,其光催化反应速率是 g-C3N4 的 6.6 倍。研究了牺牲剂的影响,结果表明三乙醇胺会抑制 U(VI)的光氧化还原,但甲醇可以通过消耗光生空穴来加速 U(VI)的光氧化还原。这种一元 KOH 熔盐合成法在制备碳氮化物方面具有非凡的应用潜力,所获得的产物在从水溶液中萃取铀(VI)以用于核燃料工业和铀(VI)环境污染净化方面也显示出潜力。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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