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Updated: Jan 18, 2026
Author Spotlight: Accelerating Discovery in Microporous Material Chemistry
Published on: October 6, 2023
Spatiotemporally ordered topological transformation in layered double hydroxides enables synergistic mineralization
Meiqi Zheng1, Huanxu Du1,2, Xiaoqing Cao1
1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China.
Abstract:
The co-contamination of arsenite (AsIII) and cadmium (Cd2+) poses a significant challenge in environmental remediation due to their divergent chemical speciation and transformation pathways. Here, a redox-active layered double oxide (MgMn-LDO) is designed, and achieves adsorption capacities of 821.7 mg g‒1 for AsIII and 1895.6 mg g‒1 for Cd2+ in their coexisting system, presenting a state-of-the-art performance. Unexpectedly, the co-adsorption system not only enhances individual adsorption capacities but also accelerates the adsorption rate by 181‒fold compared to single-component systems. The LDO undergoes a four-stage spatiotemporally ordered topological transformation, which effectively decouples the oxidation of AsIII from the adsorption of Cd2+ and reverses the conventional competitive sequence. This stepwise mechanism ensures preferential oxidation of AsIII to AsV, followed by the alteration of Cd2+ adsorption pathway to isomorphous substitution, expanding diffusion pathways and accelerating As immobilization. Large-scale experiments demonstrate this material's potential in synergistic remediation As/Cd in mining wastewater and contaminated soils.
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