In this study, rice straw derived biochar (RSBC) was used as a precursor for obtaining oxidized biochar (RSBC-Ox), 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, R²=0.99), and to the Langmuir isotherm (achieving a maximum score of q_max=242.65 mg g^-1, R²=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.

在这项研究中，稻草衍生生物炭（RSBC）被用作获得氧化生物炭（RSBC-Ox）的前体，为此研究了从水溶液中吸附/去除铀（VI）的能力。针对不同的pH值，离子强度，U（VI）的初始浓度和温度，对RSBC-Ox的U（VI）去除功效进行了测试。RSBC-Ox达到242.65  mg  g ^-1，是摄取方面最有效的评分。实验吸附数据非常适合拟二阶动力学模型（达到平衡值q _e = 148.9  mg  g ^-1，R ² = 0.99）和Langmuir等温线（达到最大分数q _max = 242.65 毫克 g ^-1，R ²＝ 0.99）。热力学表明，吸附是吸热的，并表明内球络合，并且由固相界面中相对随机性相对增加的熵驱动。这项研究可能有助于再利用稻草作为在各种环境条件下去除U（VI）的有效且低成本的吸附剂，同时促进资源利用和材料的可持续管理，以保护环境和人类健康。