Exothermic Reaction in the Cleaning of Wastewater by a Fe 2 O 3 /Coconut Shell Activated Carbon/H 2 O 2 Heterogeneous Fenton-like System.

Energy utilization in wastewater degradation has important implications for sustainability; however, efficient multiphase Fenton-like catalysts are still needed. In this study, a heterogeneous Fe2O3/coconut shell activated carbon (CSAC) Fenton-like catalyst was prepared and evaluated with respect to degradation performance and exothermic reaction for the treatment of organic wastewater. Fe2O3@CSAC retained the porous morphology of CSAS, and Fe2O3 was uniformly loaded on the surface of CSAS. In the reaction system, the degradation rate of wastewater was higher and a large amount of heat was released; therefore, it could be applied to the energy recovery from wastewater source heat pump technology. The degradation rate of 300 mL of o-phenylenediamine solution with a concentration of 0.04 mol·L−1 was 89.0% under 0.25 mol·L−1 H2O2, 532 g·L−1 Fe2O3@CSAC, pH 7.1, and an initial reaction temperature of 30 °C, elevated to 7.9 °C. These findings clearly demonstrate the degradation performance and exothermic laws of the Fe2O3@CSAC/H2O2 multiphase Fenton-like system. [ABSTRACT FROM AUTHOR]