Controlled fabrication of flower-like α-zirconium phosphate for the efficient removal of radioactive strontium from acidic nuclear wastewater,Journal of Materials Chemistry A

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Controlled fabrication of flower-like α-zirconium phosphate for the efficient removal of radioactive strontium from acidic nuclear wastewater
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7ta07803j
Wanjun Mu _{1,

2,

3,

4} , Qianghong Yu _{1,

2,

3,

4} , Rui Zhang _{1,

2,

3,

4} , Xingliang Li _{1,

2,

3,

4} , Rui Hu _{1,

2,

3,

4} , Yao He _{1,

2,

3,

4} , Hongyuan Wei _{1,

2,

3,

4} , Yuan Jian _{1,

2,

3,

4} , Yuchuan Yang _{1,

2,

3,

4}

Affiliation

Highly efficient and low cost removal of radioactive ⁹⁰Sr from high level liquid waste (HLLW) is a key step for safe and long-term storage of nuclear waste. Herein, for the first time, we reported a novel flower-like α-ZrP material, which was prepared via a simple and economical low-temperature solid state synthesis approach. The formation mechanism of flower-like α-ZrP was investigated by changing the reaction time, temperature and phosphate precursor. Remarkably, the flower-like α-ZrP possesses desirable properties: a large surface area, and excellent resistance to acid and radiation, promoting its application in HLLW disposal. A batch of adsorption experiments indicated that flower-like α-ZrP exhibits great efficiency for the removal of Sr²⁺ from aqueous solution, and the maximum monolayer adsorption capacity for Sr²⁺ is 293.43 mg g⁻¹, which surpasses those of most of the reported adsorbents. The improved adsorption ability is mainly attributed to the larger surface area of the flower-like morphology of α-ZrP, which provides many more adsorption sites for strontium ions. Moreover, the flower-like α-ZrP shows particular selectivity for the removal of Sr²⁺ from a simulated HLLW (1 M HNO₃ solution, containing about 13 different kinds of metal elements). The adsorbed Sr²⁺ ions can be effectively stripped with a dilute HCl solution, and the regenerated α-ZrP adsorbent can be re-used at least five times without significant loss of Sr²⁺ adsorption capacity. Besides, the concrete mechanism of the strontium–adsorbent interaction was also demonstrated in this contribution. Our preliminary results suggested that flower-like α-ZrP could be potentially used as a highly effective material for the enrichment and removal of radioactive strontium from HLLW.

中文翻译：

花状α-磷酸锆的受控制备，用于有效去除酸性核废水中的放射性锶

从高放废液（HLLW）中高效，低成本地去除放射性⁹⁰ Sr是安全和长期存储核废料的关键步骤。在此，我们首次报道了一种新颖的花状α-ZrP材料，它是通过一种简单且经济的低温固态合成方法制备的。通过改变反应时间，温度和磷酸盐前驱体，研究了花状α-ZrP的形成机理。引人注目的是，花状的α-ZrP具有理想的特性：较大的表面积，优异的耐酸和耐辐射性，从而促进了其在高放废物处置中的应用。一批吸附实验表明，花状α-ZrP去除Sr ^2+的效率很高。Sr ²⁺的最大单层吸附容量为293.43 mg g ^-1，超过了大多数已报道的吸附剂。吸附能力的提高主要归因于α-ZrP的花状形态较大的表面积，从而为锶离子提供了更多的吸附位点。此外，花状α-ZrP对从模拟HLLW（1 M HNO ₃溶液，包含约13种不同金属元素）中去除Sr ²⁺表现出特别的选择性。吸附的Sr ²⁺离子可以用稀HCl溶液有效地汽提，并且再生的α-ZrP吸附剂可以重复使用至少五次，而不会显着损失Sr ²⁺吸附能力。此外，这一贡献也证明了锶与吸附剂相互作用的具体机理。我们的初步结果表明，类似花的α-ZrP可以潜在地用作高效物质，用于富集和去除高放废物中的放射性锶。

更新日期：2017-11-16

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