Key Laboratory of Marine Resource Chemistry and Food Technology (TUST) at Ministry of Education, Tianjin Key Laboratory of Brine Chemical Engineering and Resource Eco-utilization, College of Chemical Engineering and Materials Science at Tianjin University of Science and Technology, Tianjin 300457, China.
CNNP Kunhua Energy Development Co., Ltd., Hangzhou 311113, China.
J Hazard Mater. 2022 Aug 15;436:129188. doi: 10.1016/j.jhazmat.2022.129188. Epub 2022 May 20.
The removal of Cs from radioactive wastewater remains a huge challenge due to the interference of many coexisting ions. Several tin chalcogenides (XSnY, XNa, K; YTe, Se, S) were synthesized and screened for highly selective cesium removal from radioactive wastewater. It was found that NaSnS showed the best adsorption performance for low cesium concentrations. Especially after nickel doping, the adsorption capacity and thermal stability of the adsorbent were significantly enhanced. Its maximum adsorption capacity reached 436.72 mg·g within only 5 min and adsorption performance kept active in the pH range of 2-12. After being coated with a porous polysulfone (PSF) fiber, the developed PSF-NaNiSnS was applied to natural complex water with cesium concentration of 17.58 mg·L. The separation factors between Cs and competitive ions ranged from 625.21 to 13123.21. It is noteworthy that NaNO was an efficient regenerating agent and can be easily separated from the CsNO mixture for cyclic utilization. Remarkably, only 45 min in each cycle of adsorption and desorption toward cesium was realized, and the adsorption properties hardly decreased even after 50 consecutive cycles. The above advantages make the proposed material an excellent candidate for efficient Cs removal and enrichment from wastewater.
由于许多共存离子的干扰，从放射性废水中去除 Cs 仍然是一个巨大的挑战。几种锡硫属化物（XSnY、XNa、K；YTe、Se、S）被合成并筛选出来，以从放射性废水中高度选择性地去除铯。研究发现，NaSnS 对低浓度铯具有最佳的吸附性能。特别是经过镍掺杂后，吸附剂的吸附容量和热稳定性得到了显著提高。其最大吸附容量在仅 5 分钟内达到 436.72mg·g，吸附性能在 pH 值为 2-12 的范围内保持活跃。在多孔聚砜（PSF）纤维上涂覆后，开发的 PSF-NaNiSnS 被应用于铯浓度为 17.58mg·L 的天然复杂水中。Cs 与竞争离子之间的分离因子范围从 625.21 到 13123.21。值得注意的是，NaNO 是一种有效的再生剂，可以很容易地从 CsNO 混合物中分离出来，以进行循环利用。值得注意的是，在每个吸附和解吸循环中，只需 45 分钟即可实现对铯的吸附和解吸，即使经过 50 次连续循环，吸附性能也几乎没有下降。上述优点使得该材料成为从废水中高效去除和富集铯的理想候选材料。
