¹³⁷Cs is radioactive and highly hazardous to human health and the environment and its efficient removal from water is still challenging. In this study, potassium antimony tin sulfide (KATS-2) was synthesized using a hydrothermal method and utilized for the first time for cesium removal from water. KATS-2 showed a high maximum ion exchange capacity (358 mg g^-1) and distribution coefficient (1.59 $\times$ 10⁵ mL g^-1) toward Cs⁺. In particular, KATS-2 showed rapid ion exchange kinetics and reached the adsorption equilibrium within 5 min with 99% removal efficiency. The adsorption was good at a wide active pH range (1–12) even in extreme alkaline conditions (K_d = 3.26 $\times$ 10⁴ mL g^-1 at pH 12). The effect of coexisting ions was also investigated, and a high selectivity toward Cs⁺ was maintained even in artificial seawater (K_d = 3.28 $\times$ 10³ mL g^-1).Powder X-ray diffraction and thermogravimetric analysis demonstrated that KATS-2 was chemically and thermally stable. The results showed that owing to its excellent adsorption performance as well as chemical and thermal stability, KATS-2 is a promising adsorbent for Cs⁺ removal from contaminated water.

¹³⁷ Cs具有放射性，对人体健康和环境具有高度危害，如何有效地将其从水中清除仍然具有挑战性。在这项研究中，使用水热法合成了锑化锡锑钾（KATS-2），并首次用于从水中去除铯。KATS-2具有很高的最大离子交换容量（358 mg g ^-1）和分配系数（1.59）$\times$向Cs ⁺注入10 ⁵  mL g ^-1）。尤其是，KATS-2显示出快速的离子交换动力学，并在5分钟内达到了吸附平衡，去除效率为99％。即使在极端碱性条件下（K _d = 3.26 ），在宽的活性pH范围（1–12）下也具有良好的吸附$\times$10 ⁴  mL g ^-1（pH 12）。还研究了共存离子的影响，即使在人工海水中（K _d = 3.28）也能保持对Cs ⁺的高选择性。$\times$10 ³  mL g ^-1）。粉末X射线衍射和热重分析表明，KATS-2具有化学和热稳定性。结果表明，由于其出色的吸附性能以及化学和热稳定性，KATS-2是一种有望从污染水中去除Cs ^+的吸附剂。