Description:
Selective catalytic reduction of NO x with NH 3 (NH 3 -SCR) is a commonly used method to remove NO x from flue gas. However, spent SCR catalysts that have been landfilled bring potential environmental hazards and an enormous waste of resources. In this paper, a high value-added composite photocatalyst for the degradation of organic pollutants in the environment was prepared. Ti in the spent catalysts was extracted into TiOSO 4 via the acid leaching method. Then the surface of fly ash (FA) was loaded via hydrolysis precipitation to form nano-TiO 2 -coated composite particles (Ti-FA). Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) spectra confirmed the formation of heterogeneous structures including Si-O-Ti, Fe-O-Ti. The UV degradation of 10 ppm rhodamine B was found to be consistent with that of P25 at 60 min (97.13%). A heterostructures photocatalyst with excellent catalytic performance was successfully constructed by using spent SCR catalysts and loaded on the surface of another solid waste FA via its dispersion and the abundance of active components. The catalytic ability for rhodamine B exceeds that of P25, and the technology has broad application prospects in light of its cost advantage