Degradation of organophosphorus flame retardant tri(chloro-propyl)phosphate (TCPP) by (001) crystal plane of TiO₂ photocatalysts

This paper demonstrates the successful synthesis of TiO₂ with (001) crystal plane; its morphology and structure were characterized using XRD, TEM and Raman spectrometer. The results showed that TiO₂ nanosheets were bounded by (001) facets on both the top and bottom. TiO₂-001/UV photocatalytic process was proved to be a powerful method for degrading tri(chloro-propyl) phosphate (TCPP) in aqueous solution. Under the given parameters, 95% of TCPP was removed in 360 min. The photodegradation followed the pseudo-first-order kinetic reaction. The reactive species during photocatalytic oxidation of TiO₂-001 was mainly hydroxyl radical. TCPP was decomposed into small molecule organics by hydroxyl radicals, along with the release of ${\mathrm{PO}}_4^{3-}$ and Cl⁻, and most of these intermediates were eventually degraded into carbon dioxide and water.