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

IF 11.3 1区化学 Q1 CHEMISTRY, PHYSICAL ACS Catalysis Pub Date : 2018-05-01 DOI:10.1016/j.biortech.2018.02.022

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

Abstract

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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HNO3改性生物炭去除水溶液中铀(ⅵ)的研究

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。

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来源期刊

ACS Catalysis CHEMISTRY, PHYSICAL-

CiteScore

20.80

自引率

6.20%

发文量

1253

审稿时长

1.5 months

期刊介绍： ACS Catalysis is an esteemed journal that publishes original research in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. It offers broad coverage across diverse areas such as life sciences, organometallics and synthesis, photochemistry and electrochemistry, drug discovery and synthesis, materials science, environmental protection, polymer discovery and synthesis, and energy and fuels. The scope of the journal is to showcase innovative work in various aspects of catalysis. This includes new reactions and novel synthetic approaches utilizing known catalysts, the discovery or modification of new catalysts, elucidation of catalytic mechanisms through cutting-edge investigations, practical enhancements of existing processes, as well as conceptual advances in the field. Contributions to ACS Catalysis can encompass both experimental and theoretical research focused on catalytic molecules, macromolecules, and materials that exhibit catalytic turnover.