Synergistic Effects of Co-Doping on Photocatalytic Activity of Titanium Dioxide on Glucose Conversion to Value-Added Chemicals

Abstract

Development of conversion of biomass derivatives in combination with utilization of solar energy by photocatalysts is a promising alternative strategy for biorefineries. The photocatalytic reaction could convert glucose to a mixture of value-added chemicals under UV irradiation. Modifications of titanium dioxide (TiO 2 ) nanoparticles by metal or metalloid (i.e., B and Ag) and nonmetal (i.e., N) dopants were carried out. The effects of co-doping (i.e., B/N and Ag/N) on physicochemical characteristics of the modified photocatalysts, photocatalytic glucose conversion, and the yields of the target chemical products (i.e., gluconic acid, xylitol, arabinose, and formic acid) were studied. The doping of the photocatalysts by different single dopants could improve the performance in terms of productivity and was further enhanced by the synergism from co-doping. The improvement in catalytic performances of the photocatalysts corresponded with the alterations in physicochemical characteristics of the catalysts resulting from the dopants.

Effect of Process Parameters on the Microstructure and Performance of TiO2-Loaded Activated Carbon

“…To solve this problem, the doping modification with metal or nonmetal materials seems to be a common approach and is widely adopted by previous studies. 9 , 10 Indeed, its regeneration performance is improved by these treatments, but the TiO 2 /AC synthesis cost is further increased. Moreover, this doping modification only aimed to enhance the photocatalytic activity, while the adsorption performance of TiO 2 /AC is weakened in most cases.…”

“…However, due to the large energy bandgap and rapid electron–hole recombination rate characteristic of TiO 2 and other factors such as the poor stability of TiO 2 and adsorption property, the regeneration efficiency of TiO 2 /AC is still not satisfactory. To solve this problem, the doping modification with metal or nonmetal materials seems to be a common approach and is widely adopted by previous studies. , Indeed, its regeneration performance is improved by these treatments, but the TiO 2 /AC synthesis cost is further increased. Moreover, this doping modification only aimed to enhance the photocatalytic activity, while the adsorption performance of TiO 2 /AC is weakened in most cases.…”

Recent Advances in Photocatalytic Transformation of Carbohydrates Into Valuable Platform Chemicals

“…For Ag/N-doped TiO 2 catalyst, Ag acts as electron traps to facilitate charge separation. The improved charge separation and increased active surface area lead to enhanced generation of hydroxyl radicals, which further oxidize glucose to various high-value chemicals (Suriyachai et al, 2020).…”

Photocatalysis and Li-Ion Battery Applications of {001} Faceted Anatase TiO2-Based Composites

“…Codoping: Heterostructuring the TiO 2 -001 by codoping with two or more dopants is reported to achieve significant synergistic effects compared to their single ion doped or undoped TiO 2 counterparts [75,76]. The strong interaction between these dopants within the TiO 2 matrix alters the charge carrier transfer-recombination dynamics and shifts the band gap absorption to the visible region [77].…”