The construction of a palladium–hydrogen accelerated catalytic Fenton system enhanced by UiO-66(Zr)

Abstract

A novel improved Fenton system named MHACF-UiO-66(Zr) was constructed under normal temperature and pressure based on the reduction of Fe^III accelerated by hydrogen. The regeneration of Fe^II was enhanced by Pd/UiO-66(Zr). The hydroxyl radical could be continuously generated using only trace level Fe^II. 10 mg L⁻¹ 4-chlorophenol could be thoroughly degraded in the initial conditions of 75 mL min⁻¹ H₂, pH 3, 20 mM H₂O₂, 2 g L⁻¹ Pd/UiO-66(Zr) and 20 μM Fe^II. Moreover, the removal efficiency of 15 mg L⁻¹ sulfamethazine could be maintained at least more than 94% under the same conditions. The activity of the solid catalyst could be maintained after 6 consecutive reaction cycles. This provides new insight for improving the inherent shortcomings of the Fenton reaction, which generates large amounts of iron sludge.