The construction of accelerated catalytic Fenton reaction based on Pd/MIL-101(Cr) and H2

Abstract

A novel catalytic Fenton system based on H₂ and the solid catalyst Pd/MIL-101(Cr) (MHACF-MIL-101(Cr)) was developed at normal temperature and pressure. In this system, the reduction process of Fe^III back to Fe^II was accelerated significantly. Using only trace levels of Fe^II at the beginning of the reaction, MHACF-MIL-101(Cr) provided continuous production of hydroxyl radicals and rapid degradation of the model contaminant 4-chlorophenol (10 mg L⁻¹) under the initial conditions of pH 3, 25 μM Fe^II, 25 mM H₂O₂, 85 mL min⁻¹ H₂ and 2 g L⁻¹ Pd/MIL-101(Cr). The activity of the solid catalyst gradually decreased from 100% to about 70% after 6 consecutive degradation reaction cycles of 18 h. This may mainly be attributed to the structural damage and the surface area reduction of this catalyst.