Nanocrystalline Ce(OH)4-based materials: ruthenium selective adsorbent for highly alkaline radioactive liquid waste

IF 1.4 3区化学 Q4 CHEMISTRY, INORGANIC & NUCLEAR Radiochimica Acta Pub Date : 2024-02-13 DOI:10.1515/ract-2023-0194

Jayaprakasam Selvakumar, Kumari Anshul, Padala A. Nishad, Bhaskarapillai Anupkumar, Subramanian Srinivasan, Nethapakkam R. Jawahar, Appadurai L. Rufus, Jayantha K. Gayen, Tulasi V. Krishna Mohan

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Abstract

Cerium hydroxide, Ce(OH)4 (Ce), has been synthesised and assessed as a Ru-selective adsorbent for treating alkaline radioactive liquid waste. Infrared spectroscopy, thermal analysis, scanning electron microscopy, and energy-dispersive X-ray spectroscopy investigations confirmed the successful formation of nanocrystalline Ce from Ce(NO3)3·6H2O. Selective removal of 106Ru from the ion-exchange effluent of intermediate-level liquid waste (ILW) by Ce was assessed using a high-pure germanium (HPGe) gamma-ray spectrometer. The calculated average distribution coefficient (k D) was ∼200 mL/g. The percentage removal of 106Ru using Ce by varying time, [106Ru] and [Ce] was calculated. The adsorption of 106Ru on Ce follows pseudo-second-order and Freundlich isotherms. The calculated Q max was 93,584 Bq/g. Accelerated leaching studies of the Ru-laden Ce cement product were carried out and found suitable for transport and disposal. Further, Ce-Polyether sulphone (Ce-PES) and Ce-Chitosan (CeC) composites were prepared and assessed for their Ru-uptake capacity for engineering scale application.

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基于 Ce(OH)4 的纳米晶材料：用于高碱性放射性废液的钌选择性吸附剂

氢氧化铈（Ce(OH)4 (Ce)）已被合成并评估为一种处理碱性放射性液体废物的 Ru 选择性吸附剂。红外光谱、热分析、扫描电子显微镜和能量色散 X 射线光谱研究证实，Ce(NO3)3-6H2O 成功地形成了纳米晶 Ce。使用高纯锗（HPGe）伽马射线光谱仪评估了 Ce 从中级液体废物（ILW）离子交换流出物中选择性去除 106Ru 的情况。计算得出的平均分布系数（k D）为 200 mL/g。通过改变时间、[106Ru]和[Ce]，计算了利用 Ce 去除 106Ru 的百分比。106Ru 在 Ce 上的吸附遵循伪二阶和 Freundlich 等温线。计算得出的最大 Q 值为 93,584 Bq/g。对含有 Ru 的 Ce 水泥产品进行了加速沥滤研究，发现其适合运输和处置。此外，还制备了 Ce 聚醚砜（Ce-PES）和 Ce 壳聚糖（CeC）复合材料，并对其在工程规模应用中的 Ru 吸收能力进行了评估。

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