制备 MnO2 改性冬瓜生物炭以增强水溶液中 U(VI) 的吸附能力

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Qing Zhou, Yanjun Du, Zihao Feng, Qi Ren, Yang Wang, Xiaoyong Chen, Yang Li, Yun Wang
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引用次数: 0

摘要

本研究采用高锰酸钾氧化/水热法合成了二氧化锰修饰的冬瓜生物炭(MnO2@WBC),用于去除铀(VI)。研究了影响 MnO2@WBC 吸附铀(VI)的因素,包括 pH 值、吸附剂用量、时间、温度和初始铀(VI)浓度。对该材料的性能进行了表征,并使用多种技术分析了其去除铀(VI)的内在机理。表征结果表明,MnO2@WBC 具有良好的分散性,表明 MnO2 有效阻止了 WBC 的聚集,提高了反应表面积,提供了更多的活性位点,能有效促进 U(VI) 的络合和吸附。该过程表明化学吸附起主导作用。Freundlich 等温线模型与观察到的吸附行为高度吻合,表明吸附过程主要是多层吸附。热力学研究表明,吸附是一个自发的内热过程。XPS 分析表明,吸附过程主要是由于 C-O、Mn-O-H 和 C=O 形成了稳定的络合物。结果表明,MnO2@WBC 能有效地去除铀(VI),在 pH 值为 5.0 时的最大吸附容量为 240.86 mg g-1。这些发现为处理受铀(VI)污染的废水提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation of MnO2 modified winter melon-derived biochar for enhanced adsorption of U(VI) from aqueous solution
This work synthesized MnO2 modified winter melon-derived biochar (MnO2@WBC) using potassium permanganate oxidation/hydrothermal method for uranium(VI) removal. The factors influencing uranium(VI) adsorption by MnO2@WBC, including pH, adsorbent dosage, time, temperature, and initial U(VI) concentration were explored. The material’s performance was characterized, and the underlying mechanism of U(VI) removal was analyzed using various techniques. The characterization results indicated that the MnO2@WBC exhibited excellent dispersibility, suggesting that MnO2 effectively prevented WBC aggregation and enhanced the reactive surface area, and providing more active sites that can effectively promote the complexation and adsorption of U(VI). The process suggested a dominant role for chemical adsorption. The Freundlich isotherm model demonstrated a high degree of alignment with the observed adsorption behavior, indicating a predominantly multilayer adsorption process. Thermodynamic studies indicated that adsorption was a spontaneous endothermic process. The XPS analysis demonstrated that the adsorption process was primarily due to the formation of stable complexes with C–O, Mn–O–H and C=O. The results demonstrated that MnO2@WBC effectively removed U(VI), achieving a maximum adsorption capacity of 240.86 mg g−1 at a pH of 5.0. These findings provided a theoretical basis for the treatment of wastewater contaminated with U(VI).
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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