Abstract
Fenton reaction is a traditional advanced oxidation process that has long been used for wastewater treatment. However, the narrow pH range of 2–4, the inefficient utilization of both H2O2 and Fe2+, and the large amount of iron sludge formation limit its application. Here, we prepared sodium alginate composite hydrogel spheres with both Fe2+ and CoS2 loading (denoted as CoS2/Fe/SA hydrogel spheres) to construct a CoS2/Fe/SA + H2O2 reaction system. The degradation efficiency of carbamazepine (CBZ) in the CoS2/Fe/SA + H2O2 system was significantly enhanced with a first-order kinetic reaction constant of 0.1958 min−1, which is 8.9 times higher than that in Fe2++H2O2 system. When the initial solution pH was in the range of 2–8, the removal rate of CBZ at 90 min reaction time ranged from 96.5 % to 99.9 %. The enhanced degradation efficiency even in a slightly alkaline aqueous solution was due to the sustained slow release of Fe2+ from the CoS2/Fe/SA hydrogel spheres that enhances the utilization of Fe2+ and the promotion of Fe3+/Fe2+ cycling via CoS2. Moreover, the release amount of Fe2+ in CoS2/Fe/SA hydrogel spheres could be controlled by tuning the Fe2+ loading amount during preparation, which in turn determines its number of cycling uses.
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