Effects and mechanism of U(VI) removal by waste kelp biochar loaded with iron-doped zinc oxide (nFe–ZnO) nanoparticles

IF 1.5 3区 化学 Q3 CHEMISTRY, ANALYTICAL
Qiqi Deng, Mingjuan Zhang, Taotao Zeng, Guohua Wang, Yusong Fu, Zhi Wang, Zhiyu Xiong, Shuibo Xie
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引用次数: 0

Abstract

This study used kelp to create biochar (BC) and then modified it with iron-doped zinc oxide (nFe–ZnO) to prepare Fe–ZnO@BC. Under optimal conditions, the adsorption capacity of Fe–ZnO@BC for U(VI) was 146.16 mg g−1. Freundlich isotherm and quasi-second order kinetic model exhibited excellent fitting to the isotherm and kinetics of uranium adsorption by Fe–ZnO@BC, respectively. The thermodynamic analysis indicated that the U(VI) adsorption process was endothermic and spontaneous. After six adsorption cycles, Fe–ZnO@BC retained its remarkable U(VI) removal performance. Advanced characterization techniques suggested that the main mechanism involved surface adsorption and reduction. These findings imply that Fe–ZnO@BC is a viable adsorbent for wastewater cleanup involving uranium contamination.

铁掺杂氧化锌纳米颗粒对废海带生物炭脱除U(VI)的影响及机理
本研究利用海带制备生物炭(BC),然后用掺铁氧化锌(nFe-ZnO)对其进行改性制备Fe - ZnO@BC。在最佳条件下,Fe - ZnO@BC对U(VI)的吸附量为146.16 mg g−1。Freundlich等温线和准二级动力学模型分别较好地拟合了Fe - ZnO@BC吸附铀的等温线和动力学。热力学分析表明,U(VI)吸附过程是吸热自发的。经过6次循环吸附后,Fe - ZnO@BC仍保持了较好的U(VI)去除性能。先进的表征技术表明,其主要机理是表面吸附和还原。这些发现表明,Fe - ZnO@BC是一种可行的吸附剂,可用于铀污染废水的净化。
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来源期刊
CiteScore
2.80
自引率
18.80%
发文量
504
审稿时长
2.2 months
期刊介绍: An international periodical publishing original papers, letters, review papers and short communications on nuclear chemistry. The subjects covered include: Nuclear chemistry, Radiochemistry, Radiation chemistry, Radiobiological chemistry, Environmental radiochemistry, Production and control of radioisotopes and labelled compounds, Nuclear power plant chemistry, Nuclear fuel chemistry, Radioanalytical chemistry, Radiation detection and measurement, Nuclear instrumentation and automation, etc.
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