Oxidized biochar obtained from rice straw as adsorbent to remove uranium (VI) from aqueous solutions
Oxidized biochar obtained from rice straw as adsorbent to remove uranium (VI) from aqueous solutions
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DOI：
10.1016/j.jece.2021.105104
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发表时间：
2021-02-10
影响因子：
7.7
通讯作者：
Nunez-Delgado, Avelino
中科院分区：
文献类型：
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作者：
Ahmed, Waqas;Mehmood, Sajid;Nunez-Delgado, Avelino
以稻草源生物炭（RSBC）为前驱体制备氧化生物炭（RSBCOx），研究其对水溶液中铀（VI）的吸附去除能力。在不同pH值、离子强度、U（VI）初始浓度和温度条件下，测试RSBC-Ox对U（VI）的去除效果。RSBC-Ox达到242.65 mg g（-1），是关于摄取的最有效评分。实验吸附数据与伪二级动力学模型（在平衡时达到q（e）= 148.9 mg g（-1），R-2 = 0.99）和朗缪尔等温线（达到最大得分q（max）= 242.65 mg g（-1）络合，熵驱动，在固溶体界面中具有相对增加的随机性）拟合良好。本研究有助于在各种环境条件下将稻草作为一种有效、低成本的U（VI）吸附剂进行再利用，同时促进资源利用和材料的可持续管理，有助于保护环境和人类健康。，R-2 = 0.99）。热力学分析表明，吸附是吸热的，并表示内球络合，和熵驱动的随机性相对增加的固-液界面。本研究有助于在各种环境条件下将稻草作为一种有效、低成本的U（VI）吸附剂进行再利用，同时促进资源利用和材料的可持续管理，有助于保护环境和人类健康。
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.