Palladium is an indispensable metal due to its wide range of industrial applications. Pd refining, however, is an extremely energy-intensive process with a serious environmental impact. Thus, the selective recovery of Pd from secondary sources is rather important. In this direction, solid sorbents are promising candidates owing to their reusability. Here, we report the synthesis of porous polyisothiocyanurates through the trimerization of 1,4-phenyldiisothiocyanate under ionothermal conditions, named covalent isothiocyanurate frameworks (CITCFs), bearing in situ generated thiourea moieties as binding sites for Pd. High surface area of CICTFs, 1,589 m² g⁻¹, along with the presence of abundant sulfur atoms within a hierarchically porous network, enabled an exceptional Pd(II) uptake capacity of 909 mg g⁻¹, fast adsorption kinetics, stable uptake over a wide pH range, and selective Pd(II) recovery from wastewater conditions. Moreover, the reduction of recovered Pd(II) within the polymer network led to highly efficient heterogeneous catalysis for the Suzuki-Miyaura cross-coupling reaction.

钯因其广泛的工业应用而成为不可或缺的金属。然而，钯精炼是一种能源密集型工艺，对环境造成严重影响。因此，从二次资源中选择性回收 Pd 是相当重要的。在这个方向上，固体吸附剂由于其可重复使用性而成为有希望的候选者。在这里，我们报道了在离子热条件下通过 1,4-苯基二异硫氰酸酯的三聚化合成多孔聚异硫氰脲酸酯，称为共价异硫氰脲酸酯骨架 (CITCFs)，具有原位生成的硫脲部分作为 Pd 的结合位点。CICTF 的高表面积，1,589 m ² g ^-1，以及分层多孔网络中大量硫原子的存在，实现了 909 mg g ^-1的出色 Pd(II) 吸收能力、快速吸附动力学、在宽 pH 范围内稳定吸收和选择性 Pd(II) 回收从废水条件。此外，聚合物网络中回收的 Pd(II) 的还原导致 Suzuki-Miyaura 交叉偶联反应的高效多相催化。