数字农科院2.0

Post-Engineering Of Biochar Via Thermal Air Treatment For Highly Efficient Promotion Of Uranium(Vi) Adsorption

文献类型： 外文期刊

作者： Dai, Lichun;Dai, Lichun;Ran, Yi;Yang, Mei;Huang, Huagang;Li, Liang;Ma, Hanqing;Lu, Qian;Yang, Mei;Ran, Yi;Ran, Yi;Dai, Lichun;Dai, Lichun;Zhu, Wenkun;Lu, Qian

作者机构：

关键词： Biochar; Thermal Air Treatment; Adsorption; Uranium; Oxygenation

期刊名称： BIORESOURCE TECHNOLOGY

ISSN： 0960-8524

年卷期： 2020 年 298 卷

页码：

摘要： Biochar from pyrolysis/gasification is relatively poor in oxygen-containing groups and low in micro/mesoporosity, which constrains its adsorption performance. Here, thermal air treatment (TAT) at a mild condition (300 degrees C in air) was applied to oxygenate the surfaces of various biochars and modify their pore structures for the promotion of their uranium (U(VI)) adsorptions. Results showed that TAT had a high product yield (> 76%), increased the O contents, O/C ratios and O-containing groups in biochars, and substantially developed the micro/mesoporosities of biochars. Batch adsorption results showed that TAT remarkably improved U(VI) adsorption capacities of various biochars. Specifically, the maximum U(VI) adsorption capacities of ash-poor corn cob biochar and ash-rich sewage sludge biochar were increased by 137% to 163 mg/g and 23% to 97 mg/g, respectively. Thus, TAT might be a promising strategy to engineer various biochars for adsorptive applications.

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