Mechanism research of catalytic degradation of 1, 2-dichlorobenzene over highly efficient hollow calcium ferrite by in situ FTIR spectra

Abstract

The hierarchical CaFe2O4 core-shell hollow microspheres are successfully fabricated by a facile solvothermal approach following heat treatment process. The hollow architecture exhibits high surface area and strong visible-light absorption capability. Meanwhile, the formation mechanism of hollow structure is proposed based on characterization results. Furthermore, the photocatalytic activity is tested by 1, 2-dichlorobenzene degradation under visible light irradiation, and the degradation ratio of CaFe2O4 core-shell hollow microspheres can reach 82.0% after 8 h. Moreover, relying on the in situ Fourier transform infrared technology, the catalytic oxidation process and degradation mechanism is clarified on CaFe2O4 surface, and the intermediate product (formate, acetate, maleate species, etc.) and the mineralized products (CO2 and H2O) are identified finally.