{"title":"Effects and mechanism of U(VI) removal by waste kelp biochar loaded with iron-doped zinc oxide (nFe–ZnO) nanoparticles","authors":"Qiqi Deng, Mingjuan Zhang, Taotao Zeng, Guohua Wang, Yusong Fu, Zhi Wang, Zhiyu Xiong, Shuibo Xie","doi":"10.1007/s10967-025-10048-8","DOIUrl":null,"url":null,"abstract":"<div><p>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<sup>−1</sup>. 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.</p></div>","PeriodicalId":661,"journal":{"name":"Journal of Radioanalytical and Nuclear Chemistry","volume":"334 4","pages":"2741 - 2755"},"PeriodicalIF":1.5000,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Radioanalytical and Nuclear Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10967-025-10048-8","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, ANALYTICAL","Score":null,"Total":0}
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.
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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