Cold sintering of strontium-adsorbed titanate adsorbents for stabilization and immobilization of secondary solid nuclear waste

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-04-01 DOI:10.1016/j.ceramint.2025.01.156

Chi Zhang , Pengju Chen , Yi Zhou , Yue Ji , Shunyan Ning , Lifeng Chen , Yupeng Xie , Hao Wu , Yan Wu , Yuezhou Wei , Weiqun Shi , Xiangbiao Yin

{"title":"Cold sintering of strontium-adsorbed titanate adsorbents for stabilization and immobilization of secondary solid nuclear waste","authors":"Chi Zhang , Pengju Chen , Yi Zhou , Yue Ji , Shunyan Ning , Lifeng Chen , Yupeng Xie , Hao Wu , Yan Wu , Yuezhou Wei , Weiqun Shi , Xiangbiao Yin","doi":"10.1016/j.ceramint.2025.01.156","DOIUrl":null,"url":null,"abstract":"<div><div>The efficient immobilization of strontium-adsorbed titanates, a secondary radioactive waste from the Fukushima nuclear accident, is critical for post-accident remediation. This study presents cold sintering as a novel, one-step technique for stabilizing and immobilizing titanates for long-term disposal. In this study, sodium nonatitanate (SNT) powder was synthesized using a hydrothermal method, and the effects of transient liquid solutions, sintering temperature, uniaxial pressure, holding time on the densification of cold-sintered sodium nonatitanate (CS-SNT) were systematically investigated. The results indicate that interlayer water in sodium nonatitanate can serves as the transient solution. With optimal cold sintering conditions at 200 °C, 500 MPa, and 1 h, the relative density of Sr-SNT after cold sintering reaches 96.4 %. The sintered solidified matrix exhibited impressive mechanical properties, with a microhardness of 2.077 GPa and a compressive strength of 627 MPa. The leaching rate of the sintered solidified matrix after 14 days leaching experiments at 90 °C in deionized water was 7.1×10<sup>−7</sup> g cm<sup>−2</sup> d<sup>−1</sup>, showing that the solidified matrix had excellent chemical stability. The experimental results suggest that cold sintering might offers an effective, efficient, and environmentally sustainable method for Sr-SNT stabilization and solidification. This approach has the potential to advance practical technologies for managing and disposing of secondary waste from nuclear accidents.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 10","pages":"Pages 13100-13110"},"PeriodicalIF":5.1000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ceramics International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0272884225001683","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

The efficient immobilization of strontium-adsorbed titanates, a secondary radioactive waste from the Fukushima nuclear accident, is critical for post-accident remediation. This study presents cold sintering as a novel, one-step technique for stabilizing and immobilizing titanates for long-term disposal. In this study, sodium nonatitanate (SNT) powder was synthesized using a hydrothermal method, and the effects of transient liquid solutions, sintering temperature, uniaxial pressure, holding time on the densification of cold-sintered sodium nonatitanate (CS-SNT) were systematically investigated. The results indicate that interlayer water in sodium nonatitanate can serves as the transient solution. With optimal cold sintering conditions at 200 °C, 500 MPa, and 1 h, the relative density of Sr-SNT after cold sintering reaches 96.4 %. The sintered solidified matrix exhibited impressive mechanical properties, with a microhardness of 2.077 GPa and a compressive strength of 627 MPa. The leaching rate of the sintered solidified matrix after 14 days leaching experiments at 90 °C in deionized water was 7.1×10⁻⁷ g cm⁻² d⁻¹, showing that the solidified matrix had excellent chemical stability. The experimental results suggest that cold sintering might offers an effective, efficient, and environmentally sustainable method for Sr-SNT stabilization and solidification. This approach has the potential to advance practical technologies for managing and disposing of secondary waste from nuclear accidents.

Abstract Image

查看原文本刊更多论文

冷烧结吸附锶的钛酸盐吸附剂对二次固体核废料的稳定和固定化

锶吸附钛酸盐是福岛核事故产生的二次放射性废物，其有效固定化对事故后的补救工作至关重要。本研究将冷烧结作为一种新型的一步法技术，用于稳定和固定钛酸盐，以便进行长期处置。本研究采用水热法合成了壬钛酸钠（SNT）粉末，并系统研究了瞬态液溶、烧结温度、单轴压力和保温时间对冷烧结壬钛酸钠（CS-SNT）致密化的影响。结果表明，壬钛酸钠中的层间水可以作为瞬态溶液。在 200 ℃、500 MPa 和 1 h 的最佳冷烧结条件下，冷烧结后 Sr-SNT 的相对密度达到 96.4%。烧结固化基体表现出令人印象深刻的机械性能，微硬度为 2.077 GPa，抗压强度为 627 MPa。烧结固化基体在 90 °C 的去离子水中浸泡 14 天后的浸出率为 7.1×10-7 g cm-2 d-1，表明固化基体具有良好的化学稳定性。实验结果表明，冷烧结可能为硒-SNT 的稳定和固化提供了一种有效、高效和环境可持续的方法。这种方法有望推动核事故二次废物管理和处置实用技术的发展。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.