Abstract
AbstractThe removal of complexed heavy metals in complexation plating effluents is always a problem. Here molybdenum disulfide/copper sulfide (MoS2/CuS) composite was synthesized to activate peroxosulfate (PMS) to treat complexation nickel simulated plating effluents. MoS2/CuS showed excellent PMS activation effect. The removal efficiency of 50 ppm Ni‐EDTA by MoS2/CuS+PMS process and Ni‐citrate by MoS2/CuS process reached 99.7 % and 100 % for 20 min treatment, respectively. The excellent performance of MoS2/CuS+PMS process for heavy metal complexes removal is attributed to two ways: oxidative degradation and catalytic decomplexation. Oxidative degradation is to degrade complexing agent into small molecules through .SO4− produced by PMS activated directly by the synergy between MoS2, CuS and Ni‐EDTA. Catalytic decomplexation is to replace Ni2+ in Ni‐EDTA by the metal active sites of MoS2/CuS to release Ni2+ and remove it. These two degradation pathways make the MoS2/CuS+PMS process has excellent removal efficiency. In addition, the MoS2/CuS+PMS process eliminates the dependence of the Fenton reaction on iron‐based reagents and avoids the production of iron sludge precipitation. These findings provide new insights for the development of metal sulfide activating PMS to treat complexation plating effluents.
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