Impact of humidity on the removal of volatile organic compounds over Fe loaded TiO2 under visible light irradiation: Insight into photocatalysis mechanism by operando DRIFTS

Saqlain, Shahid; Jun, Byeong; Kim, Soong Yeon; Sung, Ji Yeong; Choi, Myung Chul; Seo, Hyun Ook; Kim, Young Dok

doi:10.1016/j.mtcomm.2021.102119

Cited by 14 publications

(7 citation statements)

References 69 publications

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“…In the case of acetaldehyde, there are mixed reports about the role of water vapor on the photocatalytic degradation rate, with some authors describing a marked detrimental effect of humidity on molecule disappearance [95,133] and others reporting enhanced mineralization in the presence of water vapor [123,133] (Fig. 16).…”

Section: Effect Of Watermentioning

confidence: 99%

“…In the case of acetaldehyde, there are mixed reports about the role of water vapour on the photocatalytic degradation rate, with some authors describing a marked detrimental effect of humidity on molecule disappearance [95,133] and others reporting enhanced mineralization in the presence of water vapour [123,133] (Figure 16). The slower kinetics of acetaldehyde disappearance on pristine TiO 2 was related to its decreased adsorption in humid conditions, due to competition with water molecules [34,95,134].…”

Section: Effect Of Watermentioning

confidence: 99%

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Photocatalytic removal of gaseous ethanol, acetaldehyde and acetic acid: from a fundamental approach to real cases

Pargoletti

Rimoldi

Meroni

et al. 2022

International Materials Reviews

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The photocatalytic oxidation of volatile organic compounds (VOCs) has been extensively investigated. With respect to water treatment, photocatalytic degradation of air pollutants is still less understood, but this has not prevented photocatalytic building materials and air purifiers to reach the market. Here, we provide a selective overview of the current understanding on VOC photocatalytic oxidation, focusing on ethanol, acetaldehyde, and acetic acid. Among the main indoor pollutants, these molecules are also oxidation intermediates of numerous VOCs. Their adsorption at the photocatalyst surface is first presented, based on theoretical and experimental evidence. Reaction intermediates are discussed, comparing proposed reaction mechanisms. The role of the photocatalyst features in directing adsorption and oxidation phenomena is highlighted, encompassing both TiO2 and emerging photocatalysts. We then critically discuss gaps in our knowledge, such as the effect of air humidity, multi-pollutant interactions and deactivation pathways. Finally, attempts to model VOC degradation in realistic conditions are reviewed.

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Section: Effect Of Watermentioning

confidence: 99%

Section: Effect Of Watermentioning

confidence: 99%

Photocatalytic removal of gaseous ethanol, acetaldehyde and acetic acid: from a fundamental approach to real cases

Pargoletti

Rimoldi

Meroni

et al. 2022

International Materials Reviews

View full text Add to dashboard Cite

show abstract

“…To avoid a lengthy discussion, here we present the most used operando techniques in photocatalysis such as Infrared spectroscopy (DRIFTS, ATR-IR, SSITKA) [4,[66][67][68][69][70][71][72], Raman [73] and X-ray absorption spectroscopy (EXAFS and XANES) [74,75,76] including some examples provided to better understand the reaction mechanisms.…”

Section: Operando Techniques In Photocatalysismentioning

confidence: 99%

In situ and Operando Spectroscopies in Photocatalysis: Powerful Techniques for a Better Understanding of the Performance and the Reaction Mechanism

et al. 2022

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In photocatalysis, a set of elemental steps are involved together at different time scales to govern the overall efficiency of the process. These steps are divided as follow: 1) photon absorption and excitation (in femtoseconds), 2) charge separation (femto-to picoseconds), 3) charge carrier diffusion/transport (nano-to microseconds), 4 & 5) reactant activation/conversion and mass transfer (micro-to milliseconds). The identification and quantification of these steps, using the appropriate tool/technique, can provide the guidelines to emphasize the most influential key parameter that improve the overall efficiency and to develop the "photocatalyst by design" concept. In this review, the identification/quantification of reactant activation/conversion and mass transfer (steps 4&5) is discussed in details using the in-situ/operando techniques, especially the infrared (IR), Raman and XAS spectroscopy. The use of these techniques in photocatalysis was highlighted by the most recent and conclusive case studies which allow a better characterization of the active site and revealing the reaction pathways in order to establish a structureperformance relationship. In each case study, the reaction conditions and the reactor design for photocatalysis (pressure, temperature, concentration, etc.) were thoroughly discussed. In the last part, some examples in the use of time-resolved techniques (time-resolved FTIR, photoluminescence and transient absorption) are also presented as an author's guideline to study the elemental steps in photocatalysis at shorter time scale (ps, ns and µs).

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“…Humidity is an important factor affecting VOCs oxidation reactions, because water molecules act as the electron acceptor and complete the adsorption on the surface of the photocatalysts. Saqlain S. et al [81] studied the effect of gaseous water in the air on the photocatalytic removal of acetaldehyde and toluene by Fe-doped TiO 2 nanoparticles prepared via a chemical meteorological deposition method. The results indicated that the removal rate of the pollutants increased firstly and then decreased with the increase of humidity, but the optimum humidity varied with VOC species.…”

Section: Transition Metal Dopingmentioning

confidence: 99%

Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

et al. 2022

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Volatile organic compounds (VOCs) in indoor air are considered a major threat to human health and environmental safety. The development of applicable technologies for the removal of VOCs is urgently needed. Nowadays, photocatalytic oxidation (PCO) based on metal-containing photocatalysts has been regarded as a promising method. However, unmodified photocatalysts are generally limited in applications because of the narrow light response range and high recombination rate of photo-generated carriers. As a result, nano metal-containing photocatalysts doped with elements or other materials have attracted much attention from researchers and has developed over the past few decades. In addition, different doping types cause different levels of catalyst performance, and the mechanism for performance improving is also different. However, there are few reviews focusing on this aspect, which is really important for catalyst design and application. This work aims to give a comprehensive overview of nano metal-containing photocatalysts with different doping types for the removal of VOCs in an indoor environment. First, the undoped photocatalysts and the basic mechanism of PCO is introduced. Then, the application of metal doping, non-metal doping, co-doping, and other material doping in synthetic metal-containing photocatalysts are discussed and compared, respectively, and the synthesis methods, removal efficiency, and mechanisms are further investigated. Finally, a development trend for using nano metal-containing photocatalysts for the removal of VOCs in the future is proposed. This work provides a meaningful reference for selecting effective strategies to develop novel photocatalysts for the removal of VOCs in the future.

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Impact of humidity on the removal of volatile organic compounds over Fe loaded TiO2 under visible light irradiation: Insight into photocatalysis mechanism by operando DRIFTS

Cited by 14 publications

References 69 publications

Photocatalytic removal of gaseous ethanol, acetaldehyde and acetic acid: from a fundamental approach to real cases

Photocatalytic removal of gaseous ethanol, acetaldehyde and acetic acid: from a fundamental approach to real cases

In situ and Operando Spectroscopies in Photocatalysis: Powerful Techniques for a Better Understanding of the Performance and the Reaction Mechanism

Nano Metal-Containing Photocatalysts for the Removal of Volatile Organic Compounds: Doping, Performance, and Mechanisms

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