Oxidized biochar obtained from rice straw as adsorbent to remove uranium (VI) from aqueous solutions

文献类型： 外文期刊

第一作者： Ahmed, Waqas

作者： Ahmed, Waqas;Mehmood, Sajid;Ying, Huang;Chen, Di-Yun;Ahmed, Waqas;Mehmood, Sajid;Ying, Huang;Chen, Di-Yun;Qaswar, Muhammad;Ali, Sehrish;Khan, Zulqarnain Haider;Nunez-Delgado, Avelino

作者机构：

关键词： Biochar; Uranium remediation; HNO3 oxidation; Adsorption; Wastewater treatment; Reusability

期刊名称：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING （ 影响因子：5.909； 五年影响因子：5.649 ）

ISSN：

年卷期： 2021 年 9 卷 2 期

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收录情况： SCI

摘要： In this study, rice straw derived biochar (RSBC) was used as a precursor for obtaining oxidized biochar (RSBCOx), for which the capability for adsorbing/removing uranium (VI) from aqueous solutions was investigated. The U(VI) removal efficacy of RSBC-Ox was tested for different values of pH, ionic strength, initial concentration of U (VI) and temperature. RSBC-Ox reached 242.65 mg g(-1) as the most effective score regarding uptake. Experimental adsorption data fitted well to a pseudo-second-order kinetic model (reaching a value at equilibrium of q(e) = 148.9 mg g(-1), R-2 = 0.99), and to the Langmuir isotherm (achieving a maximum score of q(max) = 242.65 mg g(-1) complexation, and entropy-driven with a relatively increased randomness in the solid-solution interface. This research could be of aid for reusing rice straw as an effective and low-cost adsorbent for U(VI) removal in various environmental conditions, simultaneously promoting resource utilization and sustainable management of the materials, aiding to protect the environment and human health. , R-2 = 0.99). Thermodynamics revealed that adsorption was endothermic, and indicated inner-sphere complexation, and entropy-driven with a relatively increased randomness in the solid-solution interface. This research could be of aid for reusing rice straw as an effective and low-cost adsorbent for U(VI) removal in various environmental conditions, simultaneously promoting resource utilization and sustainable management of the materials, aiding to protect the environment and human health.

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