期刊
BIORESOURCE TECHNOLOGY
卷 256, 期 -, 页码 247-253出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.02.022
关键词
Biochar; HNO3 oxidation; Adsorption; U(VI); XPS
资金
- National Natural Science Foundation-Outstanding Youth Foundation [41522303]
- National Natural Science Foundation of China [41473087, 41703097]
- China Postdoctoral Science Foundation [2016M600070]
- Interdiscipline Research Funds of Beijing Normal University
- Fundamental Research Funds for the Central Universities [2017MS047]
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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