Non-metal modified TiO2: a step towards visible light photocatalysis

Photocatalytic H2 Production from Water by Metal‐free Dye‐sensitized TiO2 Semiconductors: The Role and Development Process of Organic Sensitizers

“…In order to investigate the essential pathways controlling the H 2 evolution performances of Dye/TiO 2 /Pt system, the authors further performed experiments using a series of dyes (HD, PD, MOD and MO4D) [40b] with a hydrophilic or hydrophobic substituent in the dye molecules ( Figure 11 and Table 1, No. [22][23][24][25]. Specifically, hydrophobic parent dye HD has no substituent (the same structure as the dye DÀ H mentioned above), PD has hydrophobic propyl substituent at the aminophenyl end, MOD has hydrophilic methoxymethyl substituent at the aminophenyl end (the same structure as the dye DMOM mentioned above), and MO4D has hydrophilic methoxymethyl substituents at both the outer diphenylamino and inner dithiophene units.…”

“…However, serious photocorrosion of CdS [12][13][14] was observed in the photocatalytic reaction and the relatively positive CB position of WO 3 proved dissatisfactory for hydrogen production, [16] which greatly reduced the performance of the two photocatalysts in visible-light-driven water splitting. In order to solve these problems, several strategies have been used to make semiconductor catalysts active in visible light for photolysis of water, including: (1) doping metal/nonmetal ions to narrow the band gap; [18][19][20][21][22][23][24][25][26] (2) developing solid solution systems to control the band structure. [24][25][26][27] Both of the above methods are the transformation of the semiconductors themselves, which make them more suitable for visible-light-driven water splitting.…”

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

“…The techniques/methodologies include surface modification via organic materials, mixing with other visible light active semiconductors, tuning the bandgap by creating oxygen vacancies and doping with metal/nonmetals, and co-doping of nonmetals and metals. Doping elements, such as S, C, N, and B, can create interband energy states between valence and conduction bands, or lower the bandgap and thus extend the visible light absorption capacity of TiO 2 [88]. The non-metal dopants could substitute the oxygen atoms from the lattice of TiO 2 , create oxygen vacancies, and lower the bandgap.…”

Review on heterogeneous photocatalytic disinfection of waterborne, airborne, and foodborne viruses: Can we win against pathogenic viruses?

“…However, the practical and large scale utilization of the mentioned semiconductors in photocatalysis is normally hindered by the rapid recombination of charges, inadequate visible-light absorption, and a low specific surface area. In the past years, considerable efforts have been made to overcome the mentioned shortfalls and increase the photoactivity of sole semiconductors through extrinsic and intrinsic doping [53] , [54] , surface modification [55] , sensitization [56] , and coupling with other semiconductors to form heterojunctions [57] . Therefore, by considering the actual state of the review, this study focuses on a survey of the photocatalytic inactivation of waterborne, airborne, and foodborne viruses using semiconductor-assisted photocatalysis and the perspective of this important research field to tackle issues related to the spread of different viruses worldwide.…”