The influence factors on the fenton catalytic degradation of phenol using ironloaded graphene modified molecular sieve catalyst

The graphene modified molecular sieve MCM-41-supported iron oxide( gh-MCM-41-Fe) was synthesized by hydrothermal crystallization and impregnation method. The effects of catalyst dosage and H2O2 amount,water-quality conditions( initial concentration of phenol,reaction temperature,humic acid and oxalate) on the phenol degradation using gh-MCM-41-Fe as catalyst in the heterogeneous Fenton reaction were investigated systematically.The experimental results suggested that phenol degradation efficiency and COD removal could reach 97.6% and 65.9%,respectively,after 60 min reaction when the initial concentration of phenol was 100 mg·L-1. The kinetics of phenol degradation in the system of heterogeneous Fenton reaction was well-fitted with a pseudo first-order model. A positive relationship was observed between phenol degradation rates and the dosage of catalyst and H2O2. However,excessive dosages would quench ·OH free radical,which inhibited the degradation of phenol. With the increase of phenol initial concentration( from 10 to100 mg·L-1),the removal efficiency of phenol decreased,while the effective utilization of H2O2 and ·OH free radical in the system were inversely strengthened. The reaction temperature showed little influence on the phenol and COD removal. The apparent frequency factor was 105.68 min-1and the apparent activation energy was 18.43 k J·mol-1. Humic acid and oxalate in water both inhibited phenol degradation and COD removal.