Photocatalytic oxidative desulfurization of model fuel over visible light-active Cu-impregnated carbon-doped TiO2

In Situ Generation of H2O2 over MoOx Decorated on Cu2O@CuO Core–Shell Particle Nanoarchitectonics for Boosting Photocatalytic Oxidative Desulfurization

“…However, the current hydrodesulfurization technology is energy-intensive and costly, prompting the exploration of a sustainable alternative. Photocatalytic oxidative desulfurization (PODS) has emerged as a promising approach due to its mild operating conditions and high conversion efficiency for refractory sulfides. − While hydrogen peroxide (H 2 O 2 ) has shown potential as a robust oxidant for PODS, its high cost and safety considerations impede large-scale implementation. , Molecular oxygen (O 2 ) presents a more accessible option and has been successfully utilized in PODS when coupled with advanced photocatalysts like TiO 2 , g-C 3 N 4 , and BiVO 4 . − Despite extensive efforts in band structure engineering, the catalytic performance remains constrained by the inherent challenge of effectively inducing the generation of reactive oxygen species (ROS) with high reactivity. − …”

α-FeOOH-Modified Sn/N-Codoped TiO2 Bifunctional Composites for As(III) Removal through Photocatalytic Oxidation and Simultaneous Adsorption

“…Nowadays, many research studies have been done to decrease the concentration of As­(III) through photo-oxidizing the highly toxic As­(III) to lowly toxic As­(V), which possesses advantages of green, efficient, and less secondary pollution. − Among various photocatalysts, TiO 2 has been proved to be an effective photocatalyst for As­(III) oxidation, − but its wide band gap can only be excited under ultraviolet light, and the light utilization is very low . Based on our previous study, the codoping of nonmetal (such as N) and metal (such as Sn) atoms can effectively achieve TiO 2 excitation under visible light and realize complete photo-oxidation of As­(III) in a relatively short time, where N can create gap states to narrow the energy band gap of TiO 2 , and Sn 4+ can replace part of the Ti 4+ into the TiO 2 lattice for the similar radius between Sn and Ti, introducing an impurity energy level that extends the light absorption of TiO 2 into the visible region. , Nevertheless, the results displayed that Sn-and N-codoped TiO 2 had little adsorption capability for the produced As­(V), so the subsequent adsorption or curing treatment for As­(V) should be carried out immediately because there is a great risk for As­(V) being reduced to As­(III) in the environment, greatly increasing the degree of complexity for the As­(III) removal process. − Therefore, the preparation of a material possessing both photocatalytic oxidation and adsorption functions is of great significance for the complete removal of As­(III) in the wastewater.…”

Pt–Cu@Bi2MoO6/TiO2 Photocatalyst for CO2 Reduction

“…68 Copper and copper oxides have been extensively investigated for CO 2 photocatalytic conversion due to redistribution of charge carriers on the surface of photocatalyst support. 69 Copper can act as an electron trapper to inhibit electron−holes recombination. Thus, efficient separation of electron−holes leads to an increase in photocatalytic activity.…”

“…Deposition of a high amount of metal cocatalysts can provide charge recombination centers that lead to a decrease in photocatalytic performance . Copper and copper oxides have been extensively investigated for CO 2 photocatalytic conversion due to redistribution of charge carriers on the surface of photocatalyst support . Copper can act as an electron trapper to inhibit electron–holes recombination.…”