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

A novel catalytic Fenton system based on H-2 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 M Fe-II, 25 mM H2O2, 85 mL min(-1) H-2 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.