Enhanced photocatalytic performance of nanostructured TiO2 thin films through combined effects of polymer conjugation and Mo-doping

Jiang, Yue; Chen, Wen-Fan; Koshy, Pramod; Sorrell, Charles Christopher

doi:10.1007/s10853-018-03271-0

Cited by 32 publications

(24 citation statements)

References 52 publications

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“…According to Khan et al [58], the doping of ZnO with Al 2 O 3 allows the composite to absorb light with wavelengths (WLs) in the range of 400-800 nm and to reduce its thermal decomposition. However, Jiang et al [90] found that, before and after doping TiO 2 with Mo, the UV-Vis absorption spectrum of the composite does not change, because its BG remains the same. Sekar et al [91] found that doping ZnO with iron and thermally treating the composite by calcination induces a decrease in the BG from 3.3 to 3.0 eV.…”

Section: Pva-supported Photocatalysismentioning

confidence: 99%

An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

Silva

Gomes

Ferreira

et al. 2022

Water

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In recent years, alarm has been raised due to the presence of chemical contaminants of emerging concern (CECs) in water. This concern is due to the risks associated with their exposure, even in small amounts. These complex compounds cannot be removed or degraded by existing technologies in wastewater treatment plants. Therefore, advanced oxidation processes have been studied, with the objective of developing a technology capable of complementing the conventional water treatment plants. Heterogenous photocatalysis stands out for being a cost-effective and environmentally friendly process. However, its most common form (with suspended catalytic particles) requires time-consuming and costly downstream processes. Therefore, the heterogeneous photocatalysis process with a supported catalyst is preferable. Among the available supports, polymeric ones stand out due to their favorable characteristics, such as their transparency, flexibility and stability. This is a relatively novel process; therefore, there are still some gaps in the scientific knowledge. Thus, this review article aims to gather the existing information about this process and verify which questions are still to be answered.

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Section: Pva-supported Photocatalysismentioning

confidence: 99%

An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

Silva

Gomes

Ferreira

et al. 2022

Water

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“…In addition, the conjugation is formed by the interaction of unhybridized p atomic orbitals on atoms employing sp 2 -and sphybridization, ensuring that the π system of the molecule is created [18,19]. Therefore, some physical conditions, such as annealing temperature treatment or chemical modifications with the support of cross-linkers, may be employed to generate cPVA from commercial PVA [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Thermal Treatment of Polyvinyl Alcohol for Coupling MoS2 and TiO2 Nanotube Arrays toward Enhancing Photoelectrochemical Water Splitting Performance

et al. 2021

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Solar-driven photoelectrochemical (PEC) water splitting, using semiconductor photoelectrodes, is considered a promising renewable energy source and solution for environmental sustainability. Herein, we report polyvinyl alcohol (PVA) as a binder material for combining MoS2 and TiO2 nanotube arrays (TNAs) to improve PEC water splitting ability. By a thermal treatment process, the formation of the π conjunction in the PVA structure enhanced the PEC performance of MoS2/TNAs, exhibiting linear sweeps in an anodic direction with the current density over 65 μA/cm2 at 0 V vs. Ag/AgCl. Besides, the photoresponse ability of MoS2/TNAs is approximately 6-fold more significant than that of individual TNAs. Moreover, a Tafel slope of 140.6 mV/decade has been obtained for the oxygen evolution reaction (OER) of MoS2/TNAs materials.

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“…Surface chemical analysis by XPS has emerged as a standard tool in materials characterisation because it quantitatively identifies valence states [11,35,36]. Consequently, the peak shifts indicating valence increases (greater binding energies) and decreases (lower binding energies) provide information on charge transfer effects.…”

Section: Resultsmentioning

confidence: 99%

Intervalence charge transfer and thermodynamic effects on the photocatalytic performance of Fe/Mo single and codoped TiO2 thin films

et al. 2019

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Fe/Mo single doped and codoped TiO 2 thin films were spin coated on polished fused silica substrates and annealed in air at 450 °C for 2 h. The XPS data for the anatase thin films were distinctive in showing that Fe-doping caused Ti 4+ reduction, Mo-doping caused Ti 4+ oxidation, and codoping did not alter the Ti valence. The XPS data also showed that the precursor valences of Fe 3+ and Mo 5+ were reduced upon annealing. Analysis of the potential roles of thermodynamics and intervalence charge transfer (IVCT) demonstrates that the latter drives the equilibria both in solution and during annealing. Photocatalytic performance testing indicated that Fe-doping was slightly deleterious, Mo doping had a consistent positive effect, and codoping exhibited a clear negative trend as a function of doping concentration. These results are interpreted in terms of the effect of IVCT on the matrix valence, dopant valences, and charge carrier trapping. Fe doping exhibited reduced performance because both matrix Ti (4−x)+ and dopant Fe (3−y)+ acted as electron traps. Mo doping exhibited enhanced performance because the matrix Ti (4+x)+ acted as a hole trap and the dopant Mo (5−x)+ and Mo (4−x)+ acted as electron traps, thereby promoting charge separation. Codoping exhibited a clearly detected negative trend on the performance because, while Ti 4+ played no role, Fe (3−y)+ , Mo (5−x)+ , and Mo (4−x)+ all acted as traps for the majority charge carrier electrons.

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Enhanced photocatalytic performance of nanostructured TiO2 thin films through combined effects of polymer conjugation and Mo-doping

Cited by 32 publications

References 52 publications

An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

Thermal Treatment of Polyvinyl Alcohol for Coupling MoS2 and TiO2 Nanotube Arrays toward Enhancing Photoelectrochemical Water Splitting Performance

Intervalence charge transfer and thermodynamic effects on the photocatalytic performance of Fe/Mo single and codoped TiO2 thin films

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