Inadvertent release of radioactive Cs⁺ to the environment poses a grave threat as it may cause severe health problems to the exposed population. One of the practical solutions is to use effective regenerable Cs⁺ adsorbents to minimize total waste volume. In this study, a mesoporous adsorbent for Cs⁺ capture was prepared by tethering a Cs⁺-selective ligand monoamino-dibenzo-18-crown-6 (MA-DB18C6) ether on chloro-functionalized SBA-15 (Cl-SBA) support. The dispersible adsorbent (DB18C6-SBA) registered a maximum adsorption capacity of 94.54 mg g⁻¹ from non-linear Hill isotherm fitting. The model suggests near Langmuir-type of Cs⁺ capture as Hill coefficient n_H→1. This indicates nearly independent monolayer Cs⁺ binding with the tethered DB18C6 with no adsorbate interaction. Kinetic study reveals a pseudo-second order of Cs⁺ uptake rate while thermodynamic analyses show the spontaneity and endothermicity of the process. Compared with conventional ligand impregnation technique, covalently tethered DB18C6 occupy smaller surface space of SBA-15 resulting in higher ligand loading and higher adsorption capacity. DB18C6-SBA is regenerable in mild acid and exhibits consistent adsorption capacity after several reuse cycles. It can selectively capture Cs⁺ from simulated high level liquid waste, but more effectively from Cs⁺-contaminated surface water with K_D ∼ 1578 mL g⁻¹ and concentration factor CF ∼ 2267 in the presence of Na⁺, K⁺, Mg²⁺ and Ca²⁺. Cycled batch adsorption shows that DB18C6-SBA can be reused with consistent uptake performance while lab-scale sequential adsorption-nanofiltration system with Cs⁺ stripping further demonstrates its potential long-term use as Cs⁺ adsorbent for the treatment of contaminated water.

放射性Cs ^+的无意释放到环境中构成了严重威胁，因为它可能对暴露人群造成严重的健康问题。一种实用的解决方案是使用有效的可再生Cs ⁺吸附剂，以最大程度地减少废物总量。在这项研究中，通过将Cs ^+-选择性配体单氨基-二苯并-18-冠-6（MA-DB18C6）醚束缚在氯官能化的SBA-15（Cl-SBA）载体上，制备了用于Cs ⁺捕获的中孔吸附剂。非线性希尔希尔等温线拟合表明，可分散吸附剂（DB18C6-SBA）的最大吸附容量为94.54 mg g ^-1。该模型建议Cs ⁺捕获的接近Langmuir型为Hill系数n _H→1。这表明与束缚的DB18C6几乎独立的单层Cs ⁺结合，没有吸附物相互作用。动力学研究揭示了Cs ⁺吸收速率的伪秒级，而热力学分析显示了该过程的自发性和吸热性。与常规配体浸渍技术相比，共价连接的DB18C6占据了SBA-15较小的表面空间，从而导致更高的配体负载量和更高的吸附容量。DB18C6-SBA可在弱酸中再生，并在多次重复使用后表现出一致的吸附能力。它可以选择性地捕获铯⁺从模拟高放废液，但更有效地选自C ⁺ -contaminated表面水以K _d〜1578毫升克^-1和浓度因子CF〜2267的Na的存在⁺，K ⁺，Mg的²⁺和Ca ²⁺。循环分批吸附表明，DB18C6-SBA可以重复使用，并具有一致的吸收性能，而具有Cs ⁺汽提的实验室规模连续吸附-纳滤系统进一步证明了其潜在的长期用作Cs ⁺吸附剂处理污水的潜力。