Selective and efficient removal of thiosulfates (SO) to recover high-purity and value-added thiocyanate products by fractional crystallization process is a promising route for the resource treatment of coke oven gas desulfurization wastewater. Herein, catalytic wet air oxidation (CWAO), with manganese-based oxide synthesized from spent ternary lithium-ion batteries (MnO-LIBs), was proposed to selectively remove SO from desulfurization wastewater. 98.0 % of SO is selectively removed by the MnO-LIBs CWAO system, which was 4.1 times that of the MnO CWAO system. The synergistic effect among multiple metals from spent LIBs induces the enlarged specific surface area, increased reactive sites and formation of oxygen vacancy, promoting the adsorption and activation of O, thereby realizing high-efficiency removal of SO. The satisfactory selective removal efficiency can be maintained in the proposed system under complex environmental conditions. Notably, the proposed system is cost-effective and applicable to actual wastewater, in which 81.2 % of SO is selectively removed from coke oven gas desulfurization wastewater. More importantly, compared with the typical processes, the proposed process is simpler and more environmentally-friendly. This work provides an alternative route to selectively remove SO from coke oven gas desulfurization wastewater, expecting to drive the development of resource utilization of coke oven gas desulfurization wastewater.

中文翻译：

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废三元锂离子电池锰基氧化物催化湿式空气氧化选择性去除焦炉煤气脱硫废水中的硫代硫酸盐

采用分级结晶工艺选择性高效去除硫代硫酸盐（SO），回收高纯度、高附加值的硫氰酸盐产品，是焦炉煤气脱硫废水资源化处理的一条有前景的途径。在此，提出了利用废三元锂离子电池（MnO-LIB）合成的锰基氧化物的催化湿式空气氧化（CWAO）技术来选择性去除脱硫废水中的SO。 MnO-LIBs CWAO系统选择性去除了98.0%的SO，是MnO CWAO系统的4.1倍。废锂离子电池中多种金属之间的协同作用，导致比表面积增大、反应位点增加、氧空位形成，促进O的吸附和活化，从而实现SO的高效去除。在复杂的环境条件下，所提出的系统可以保持令人满意的选择性去除效率。值得注意的是，该系统具有成本效益，适用于实际废水，其中焦炉煤气脱硫废水中81.2%的SO被选择性去除。更重要的是，与典型工艺相比，所提出的工艺更加简单且更加环保。该工作为选择性脱除焦炉煤气脱硫废水中SO提供了一条替代途径，有望带动焦炉煤气脱硫废水资源化利用的发展。