Add time:08/11/2019         Source:sciencedirect.com

Nano-α-Fe2O3 can accelerate the degradation of diethyl phthalate ester (DEP) in the presence of citric acid under UV (300–400 nm) irradiation, but the underlying mechanism remains unclear. In this study, based on ultraviolet photoelectron spectra (UPS) and density functional theory (DFT) analyses, it was found that thermodynamically, a lower bandgap energy (Ebandgap = ECB-EVB < 5.8 eV) of the complex of CA-α-Fe2O3 predicted its higher catalytic ability than citric acid (Ebandgap = ELUMO-EHOMO = 7.0 eV). X-ray photoelectron spectroscopy (XPS) study indicated that citric acid was chemically adsorbed on the surface of α-Fe2O3 through its carboxyl group by filling the surface oxygen vacancies of α-Fe2O3 (disappearance of Fe2p3/2 peak at 711.5 eV). UV light induced a succession of reactions which resulted in heterogeneous photo-Fenton-like reactions that produced ·OH for DEP degradation. The dissolved oxygen was proposed to be the initial oxidant forming the reactive oxygen species. The solution pH, citric acid and α-Fe2O3 concentration substantially influenced DEP degradation. The method in this study can be further applied to study other organic acids and metal oxides catalysts.

We also recommend Trading Suppliers and Manufacturers of (S)-(-)-2-isocyanatoglutaric acid diethyl ester (cas 17046-23-0). Pls Click Website Link as below: cas 17046-23-0 suppliers