Alkali-activated mechanochemical decontamination of spent SCR catalysts: phase reconstruction for selective arsenic removal and vanadium recovery

IF 10.9 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Resources Conservation and Recycling Pub Date : 2026-04-01 Epub Date: 2026-02-04 DOI:10.1016/j.resconrec.2026.108829

Wenbin Hu , Congcong Li , Chenye Wang , Yan Li , Huiquan Li , Xinrui Wang , Feng Xie

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引用次数: 0

Abstract

Spent SCR catalysts contain toxic arsenic (As), valuable vanadium (V) and tungsten (W), posing dual hazards and resource challenges. Conventional recycling methods struggle with the selective removal of arsenic without compromising the carrier or fully recovering valuable metals. Here, an alkali-activated mechanochemical process that overcomes these limitations, achieving >99% As removal and 97% V recovery, while retaining approximately 23.4% of W in the TiO₂ carrier, allowing for direct catalyst regeneration. Mechanistic analyses confirm NaOH-triggered surface TiO₂ dissolution causes pore collapse, liberating encapsulated As/V species for reconstruction into soluble NaAsO₂/NaVO₃. XRD/EPR/XPS characterization verifies Na₂WO₄ formation through W-O bond restructuring. DFT calculations link reduced interatomic distances (below 2 Å) during ball milling to enhanced electron transfer, driving phase transformations. This work provides a sustainable and economically favorable strategy for hazardous waste valorization, highlighting a closed-loop recycling pathway with clear environmental benefits and industrial potential for spent catalyst management.

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碱活化SCR废催化剂的机械化学净化：选择性除砷和回收钒的相重构

废SCR催化剂中含有有毒的砷（As）、有价的钒(V)和钨(W)，构成了双重危害和资源挑战。传统的回收方法很难在不损害载体或完全回收有价值金属的情况下选择性地去除砷。在这里，碱激活的机械化学工艺克服了这些限制，实现了99%的As去除率和97%的V回收率，同时在TiO2载体中保留了大约23.4%的W，允许直接催化剂再生。机理分析证实，naoh引发的表面TiO2溶解会导致孔隙坍塌，释放被封装的As/V物质，重建成可溶的NaAsO2/NaVO3。XRD/EPR/XPS表征证实了通过W-O键重组形成Na2WO4。DFT计算将球磨过程中原子间距离的减少（低于2 Å）与电子转移的增强联系起来，从而驱动相变。这项工作为危险废物增值提供了一个可持续的和经济上有利的战略，突出了一个闭环回收途径，具有明显的环境效益和废催化剂管理的工业潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Resources Conservation and Recycling 环境科学-工程：环境

CiteScore

22.90

自引率

6.10%

发文量

625

审稿时长

23 days

期刊介绍： The journal Resources, Conservation & Recycling welcomes contributions from research, which consider sustainable management and conservation of resources. The journal prioritizes understanding the transformation processes crucial for transitioning toward more sustainable production and consumption systems. It highlights technological, economic, institutional, and policy aspects related to specific resource management practices such as conservation, recycling, and resource substitution, as well as broader strategies like improving resource productivity and restructuring production and consumption patterns. Contributions may address regional, national, or international scales and can range from individual resources or technologies to entire sectors or systems. Authors are encouraged to explore scientific and methodological issues alongside practical, environmental, and economic implications. However, manuscripts focusing solely on laboratory experiments without discussing their broader implications will not be considered for publication in the journal.