Low-Cost Flocculant Coated MIL-88B as Highly Efficient and Stable Fenton-Like Catalyst for Phenol Removal

In this work, three kinds of Flocculant, microcrystalline cellulose (MCC), carboxymethyl cellulose (CMC), and Chitosan (CTS), coating Fe-MOF were prepared by a coprecipitation method followed by an in situ graft copolymerization. When they employed as heterogeneous Fenton-catalysts to degrade phenol in waste water, their catalytic activity has the order of has the order of MIL-CMC (0.0873 min^− 1) > MIL-MCC (0.0794 min^− 1) > MIL-CTS (0.0712 min^− 1) > MIL-88B (0.0675 min^− 1). The reaction conditions were optimized, and found that the best reactions: MIL-CMC0.3 used as catalyst with catalyst load 20 mg/20ML, and the 25 ℃, pH = 3, and phenol of 100 ppm, could be removed completely in 5 min. Most important, Fe ions leakage of MIL: CMC is very small (0.02–0.03 mg/L), significantly less than that of MIL-88B (2.00-2.85 mg/L). The enhanced catalytic activity of Fe-MOF@flocculent could be attributed to flocculent protective action.