Abstract

Titanium hydroxide Ti(OH)₄ prepared from Rosetta ilmenite concentrate has been applied to uranium adsorption from aqueous solution. The adsorption efficiency was studied in batch experiments in relation to pH, adsorbent dose, uranium initial concentration, contact time, and temperature. The optimum adsorption conditions are as follows: pH 5, adsorbent dose 2 g L^–1, uranium initial concentration 400 mg L^–1, contact time 1 h, and room temperature (25°C); under these conditions, the uranium adsorption efficiency is about 91% and the uranium uptake is 181 mg g^–1. The obtained equilibrium data fit well with the Langmuir isotherm, while the adsorption kinetic data follow the pseudo-second-order model. The thermodynamic parameters were calculated; they show that the adsorption process is spontaneous and exothermic. The Ti(OH)₄ sorbent showed good durability; it could be regenerated using H₂SO₄.

中文翻译：

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Rosetta钛铁矿浓缩物制备的氢氧化钛作为水介质铀离子吸附剂的应用

摘要

由 Rosetta 钛铁矿精矿制备的氢氧化钛 Ti(OH) ₄已应用于从水溶液中吸附铀。在与 pH 值、吸附剂剂量、铀初始浓度、接触时间和温度相关的批量实验中研究了吸附效率。最佳吸附条件如下：pH 5，吸附剂剂量2 g L ^–1，铀初始浓度400 mg L ^–1，接触时间1 h，室温（25°C）；在这些条件下，铀吸附效率约为 91%，铀吸收量为 181 mg g ^–1. 获得的平衡数据与朗缪尔等温线拟合良好，而吸附动力学数据遵循伪二级模型。计算热力学参数；他们表明吸附过程是自发的和放热的。Ti(OH) ₄吸附剂显示出良好的耐久性；它可以使用 H ₂ SO ₄再生。