Abstract

The possibility of removing uranium species from commercial phosphoric acid using metal-modified biocarbon was examined. The biocarbon was prepared from a solid residue by pyrolysis and was activated by chemical precipitation. The structural characteristics and morphology of the composite prepared were determined, and it was tested in U separation. The influence of various factors such as shaking time, adsorbent dosage (g/mL), temperature, mechanical stirring speed, and phosphoric acid concentration on the uranium adsorption was examined. The results obtained show that the U adsorption process is applicable to both concentrated and dilute phosphoric acid, but is more efficient in the case of the dilute acid. The adsorption kinetics was described by the Lagergren first-order and pseudo-second-order models. The process was applied to uranium adsorption from commercial phosphoric acid (23.5% P₂O₅).

中文翻译：

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金属碳质结构作为高效吸附剂从磷酸中分离铀的实验和动力学研究

摘要

研究了使用金属改性的生物碳从商业磷酸中去除铀物种的可能性。生物碳是通过热解从固体残余物中制备的，并通过化学沉淀活化。测定了所制备复合材料的结构特征和形态，并在U分离中对其进行了测试。考察了各种因素的影响，例如振荡时间，吸附剂量（g / mL），温度，机械搅拌速度和磷酸浓度对铀吸附的影响。所得结果表明，U吸附过程适用于浓磷酸和稀磷酸，但在稀酸的情况下更有效。吸附动力学由Lagergren一级模型和拟二级模型描述。₂ O ₅）。