HNO3改性生物炭去除水溶液中铀(ⅵ)的研究

IF 9.7 1区 环境科学与生态学 Q1 AGRICULTURAL ENGINEERING
Jie Jin , Shiwei Li , Xianqiang Peng , Wei Liu , Chenlu Zhang , Yan Yang , Lanfang Han , Ziwen Du , Ke Sun , Xiangke Wang
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引用次数: 162

摘要

采用HNO3处理对麦秸和牛粪制备的生物炭进行化学改性,使其脱除水中的U(VI)。宏观实验证明,U(VI)在生物炭上的富集受表面络合和静电相互作用的调控。FTIR和XPS分析证实了生物炭对U(VI)的高效吸附是由于生物炭表面的羧基。R-CH2OH基团的还原剂促进了U(VI)在未处理生物炭上的吸附。改性后的生物炭表面COO基团含量较高,表面负电荷较多,对U(VI)的吸附能力较未处理的生物炭增强。在pH为4.5、K为298 的条件下,氧化WH对U(VI)的最大吸附量为355.6 mg/g,比未处理WH提高了40倍,且高于大多数碳基吸附剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

HNO3 modified biochars for uranium (VI) removal from aqueous solution

HNO3 modified biochars for uranium (VI) removal from aqueous solution

The HNO3 treatment was used to chemically modify the biochars produced from wheat straw (WH) and cow manure for U(VI) removal from aqueous solution. Macroscopic experiments proved that the enrichment of U(VI) on the biochars was regulated by surface complexation and electrostatic interactions. FTIR and XPS analyses confirmed that the highly efficient adsorption of U(VI) was due to the carboxyl groups on the biochar surfaces. The reducing agents of the R-CH2OH groups facilitated U(VI) adsorption on the untreated biochars. Owing to the higher contents of surface COO groups and more negative surface charge, the modified biochars showed enhanced U(VI) adsorption ability than the untreated ones. The maximum adsorption capacity of U(VI) by the oxidized WH was calculated to be 355.6 mg/g at pH 4.5 and 298 K, which was an improvement of 40 times relative to the untreated WH and was higher than that of most carbon-based adsorbents.

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来源期刊
Bioresource Technology
Bioresource Technology 工程技术-能源与燃料
CiteScore
20.80
自引率
19.30%
发文量
2013
审稿时长
12 days
期刊介绍: Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.
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