Heterogeneous activation of persulfate by supporting ferric oxalate onto activated carbon fibers for organic contaminants removal

摘要

The development of highly efficient and environmentally friendly catalyst to activate persulfate (PS) is a promising technology for contaminants removal. Herein, a novel heterogeneous catalyst (FeOxa@ACFs) was designed by supporting ferric oxalate (FeOxa) onto activated carbon fibers (ACFs). FeOxa@ACFs could activate PS to achieve a removal of 96.8% for Reactive Red M-3BE (RR M-3BE) within 20 min and the apparent rate constant (k(obs)) was 3.6 times higher than that of FeOxa/PS system. Moreover, FeOxa@ACFs was capable of excellent recyclability and a broad pH adaptability (3.0-10.0). Radical capturing experiments indicated that sulfate, hydroxyl and superoxide radicals played a key role for contaminants removal. Interestingly, the k(obs) of RR M-3BE was unexpectedly 4 times enhancement after the introduction of p-benzoquinone, which is very different from the previously system with a negative influence. This study will open a promising avenue for building highly efficient and eco-friendly catalyst to remediate contaminated water.