Preparation of Fe-Co/LDHs Catalyst and Its Catalytic Oxidation of Sulfur-Containing Alkali Wastewater
In this work,Fe-Co composite oxide heterogeneous catalyst(Fe-Co/LDHs)loading on hydrocalumite was prepared using impregnation approach for the catalytic air oxidation of simulated sulfur-containing alkali wastewater and real wastewater from petrochemical enterprises.The preparation conditions of the catalyst and the reaction conditions were optimized.When n(Fe)∶n(Co)=9∶1(molar ratio)in the catalyst,total metal loading percentage is 25%,and roasting temperature is 600℃,the catalyst shows the best catalytic activity.For the simulated sulfur-containing alkali wastewater with the initial sulfur concentration of 6000 mg/L,the reaction can reach desulfurization of 96.7%after 3 h with the catalyst dosage of 10 g/L,reaction temperature of 75℃,and aeration rate of 2.5 L/min,while the desulfurization can maintain 92.4%after 3 h for real sulfur-containing wastewater with the same concentration.Besides,the efficiency of the catalyst after 10 cycles shows no obvious decrease.The results show that the Fe-Co/LDHs catalyst has excellent and stable catalytic activity and have good application prospects.
Fe-Co composite oxidehydrocalumiteimpregnation approachcatalytic air oxidationsulfur-containing alkali wastewater