Herein, using dialdehyde waste paper (DAWP) as a cross-linking agent to immobilize persimmon tannin (PT) was first used to remove the U(VI) and Cr(VI) via the “waste control by waste” concept. The microscopic and macroscopic surface properties of the as-prepared adsorbent was characterized by the advanced characterization techniques. Factors that affected the elimination process such as variable pH, coexistence ions and equilibrium time were investigated by batch techniques. The results showed that the maximal removal capacities of U(VI) and Cr(VI) on DAWP-PT were 242.3 mg/g (pH = 6.0) and 178.7 mg/g (pH = 2.0) at 298 K, which exhibited competitiveness with most of the reported solid materials. Meanwhile, adsorption data were fitted perfectly to the Langmuir and Pseudo-second-order equations, which indicated that the monolayer and homogenous chemisorption dominated the removal process. The SEM-EDX, DFT and XPS analysis conformed that adsorption of U(VI) was mainly via surface complexation, while the elimination of Cr(VI) was a redox reaction process, and about 65.33% of Cr(III) and 34.67% of Cr(VI) co-existed onto the surface of DAWP-PT. Thus, this study would provide a high-efficiency and low-cost adsorbent for radionuclide and heavy metal treatment.

在此，首先使用二醛废纸（DAWP）作为交联剂固定柿子单宁（PT），通过“废物控制废物”概念去除U（VI）和Cr（VI）。所制备的吸附剂的微观和宏观表面特性通过先进的表征技术进行表征。通过分批技术研究了影响消除过程的因素，例如可变的 pH 值、共存离子和平衡时间。结果表明，DAWP-PT 对 U(VI) 和 Cr(VI) 的最大去除能力为 242.3 mg/g (pH = 6.0) 和 178.7 mg/g (pH = 2.0) 在 298 K，与大多数报道的固体材料。同时，吸附数据与朗缪尔方程和伪二阶方程完美拟合，这表明单层和均匀的化学吸附在去除过程中占主导地位。SEM-EDX、DFT 和 XPS 分析表明 U(VI) 的吸附主要通过表面络合，而 Cr(VI) 的消除是氧化还原反应过程，约 65.33% 的 Cr(III) 和 34.67% 的Cr(VI) 共存于 DAWP-PT 表面。因此，这项研究将为放射性核素和重金属处理提供一种高效、低成本的吸附剂。