Preparation of heterogeneous Fenton catalyst with residual carbon separated from coal gasification slag as carrier

Abstract

ABSTRACT This study prepares a magnetite (Fe3O4)-based Fenton-like catalyst based on the residual carbon separated from coal gasification slag as a support by the chemical precipitation method. The catalysts are characterized using XRD, SEM-EDX, and N2 adsorption-desorption methods. In the process, the adsorption capacity, catalytic activity under various conditions, and catalyst reusability were evaluated with methylene blue as the target pollutant. According to SEM results, Fe3O4 particles are attached to the pore and surface of the residual carbon support and have good dispersion. BET findings demonstrate that Fe3O4/residual carbon catalyst has a greater surface area and pore volume than residual carbon support. The removal efficiency of MB by adsorption of Fe3O4/residual carbon catalyst is less than 10% after 120 min. But 2.4Fe-UC catalyst shows 2-h removal rates of 98% when the optimum removal efficiency of MB is under the following conditions: 2.5 mmol/L H2O2, 0.2 g/L catalysts for 50 mg/L MB at an initial pH of 3. Notably, outstanding catalytic stability and reusability of the 2.4Fe-RC catalyst have been revealed as it can be reused 6 times with>80% of the MB removal efficiency.