Nanoscale TiO2 films and their application in remediation of organic pollutants

Varshney, Gaiven; Kanel, Sushil R.; Kempisty, David M.; Varshney, Vikas; Agrawal, Abinash; Sahle‐Demessie, Endalkachew; Varma, Rajender S.; Nadagouda, Mallikarjuna N.

doi:10.1016/j.ccr.2015.06.011

Cited by 130 publications

(57 citation statements)

References 186 publications

(281 reference statements)

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“…One recent review summarises the methods for the preparation of nanoscale TiO 2 fi lms for water remediation applications (95). FSP is the method of interest in this review.…”

Section: Flame Spray Pyrolysis Depositionmentioning

confidence: 99%

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

Pelletier¹

2016

Johnson Matthey Technology Review

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Oxidation technologies and advanced oxidation processes (AOPs) have been regarded as a competitive method for the remediation of persistent pollutants in water. Among AOPs, the use of photocatalysis has particularly attracted interest in recent decades. However, attempts to improve the effi ciency of photocatalysts in terms of both enhanced activity and applicability under visible light have proved challenging. In this context, there is a need for processes able to achieve the synthesis of innovative nanostructured materials meeting these criteria with reproducibility and scalability in mind. The aim of this review is to focus on two themes of interest, namely noble metal based catalysts and spray pyrolysis (SP) processes. Several alternative SP methods have been reported and these will be described. The emphasis is placed on the recent use of SP for the synthesis of noble metal/ semiconductor nanomaterials and their enhanced photocatalytic activity. Recent innovations in the design of SP processes and their potential to further improve noble metal-based photocatalysts are also examined. Finally, the possibility of using SP processes as a fl exible tool to achieve immobilisation of photocatalysts onto substrates and in reactor for real water treatment application is considered.

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“…One recent review summarises the methods for the preparation of nanoscale TiO 2 fi lms for water remediation applications (95). FSP is the method of interest in this review.…”

Section: Flame Spray Pyrolysis Depositionmentioning

confidence: 99%

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

Pelletier¹

2016

Johnson Matthey Technology Review

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“…Photons from ultraviolet light can provide energy to organic chemicals for direct photolytic decomposition (photolysis), whereas ultraviolet energy can also activate semiconducting photocatalysts such as titanium dioxide (TiO 2 ) to generate hydroxyl radicals (photocatalysis; Hou and Ku, 2013;Yu et al, 2006). TiO 2 photocatalysis is known to be one of the most promising AOTs (Varshney et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

LED‐Based Ultraviolet Oxidation of Pharmaceuticals: Effects of Wavelength and Intensity, pH, and TiO₂ Loading

Zaveri

Souza

Parenky

et al. 2018

Water Environment Research

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The presence of pharmaceuticals in water resources has alarmed water and health authorities. This study evaluated ultraviolet-based oxidation as a means to decompose sulfamethoxazole, ibuprofen, and triclosan. In particular, the study evaluated using light emitting diodes (LEDs), the so-called ultraviolet LEDs (UV-LEDs), as an alternative ultraviolet source to the problematic mercury lamps that are conventionally used in the decomposition of pharmaceuticals in water. The study explored various conditions of varying ultraviolet wavelength, irradiation intensity, reaction pH, and TiO2 loading. It compared the photolytic decomposition of the pharmaceuticals with their photocatalytic decomposition. The photolytic decomposition of the pharmaceuticals was solely determined by the relation between their ultraviolet absorption characteristics and the ultraviolet emission spectra of the LEDs. Reaction pH greatly affected both photolytic decomposition and photocatalytic decomposition. The presence of TiO2 in cases where significant photolysis was present inhibited the overall decomposition process. However, in all cases, photocatalysis showed better mineralization than photolysis.

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“…Hydrochloric acid (HCl) and sodium hydroxide (NaOH) were used to change the pH of MB solution. Four MB solutions with different concentrations were used (6,12,24, and 36 ppm) for initial concentration test. The solutions were subjected to an adsorption process to observe the initial degradation rate.…”

Section: Effects Of Aerationand Initial Ph Conditionmentioning

confidence: 99%

“…Alternatively, immobilization of TiO 2 has been explored, and displayed better catalytic compared to TiO 2 suspension [11]. Moreover, a comprehensive review of TiO 2 films was conducted by Varshney et al (2016), in which various types of coating methods (e.g., doctor-blade, chemical vapour deposition, hydrothermal, electrophoretic deposition, sputter deposition, spray pyrolysis, and flame aerosol coating methods) are thoroughly explained [12]. In an earlier study by Sökmen et al [13], immobilized TiO 2 was used for the photodegradation of MB dye.…”

Section: Introductionmentioning

confidence: 99%

Immobilized TiO2-Polyethylene Glycol: Effects of Aeration and pH of Methylene Blue Dye

et al. 2017

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Abstract:Immobilized TiO 2 and immobilized TiO 2 -polyethylene glycol (TiO 2 /PEG) films have been prepared via brush coating method. The formulation of immobilized TiO 2 film was prepared by mixing distilled water with P25, while the formulation containing P25 combined with 8% PEG in distilled water was used in preparing immobilized TiO 2 /PEG. A double sided adhesive tape (DSAT) was stacked onto a glass surface prior to coating with the formulations and annealing by a thermal treatment at 100 • C for 15 min. The photocatalytic activity of immobilized photocatalysts was evaluated under photodegradation of methylene blue (MB). It was observed that immobilized TiO 2 /PEG has showed a higher rate of photocatalytic activity compared to immobilize TiO 2 . The X-ray photoelectron spectroscopy and Fourier transform infrared (FT-IR) spectra of immobilized TiO 2 /PEG sample proved that the existence of C=O led to enhanced photoactivity efficiency under normal light and visible light irradiations. The photocatalytic activity performance of immobilized TiO 2 /PEG was the highest at 75 mL·min −1 aeration rate and pH 11 of MB dye. The correlation between of all these parameters was investigated in this study.

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Nanoscale TiO2 films and their application in remediation of organic pollutants

Cited by 130 publications

References 186 publications

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

LED‐Based Ultraviolet Oxidation of Pharmaceuticals: Effects of Wavelength and Intensity, pH, and TiO₂ Loading

Immobilized TiO2-Polyethylene Glycol: Effects of Aeration and pH of Methylene Blue Dye

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Nanoscale TiO2 films and their application in remediation of organic pollutants

Cited by 130 publications

References 186 publications

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

Improvement of Noble Metal Based Photocatalysts by Spray Pyrolysis Processes

LED‐Based Ultraviolet Oxidation of Pharmaceuticals: Effects of Wavelength and Intensity, pH, and TiO2 Loading

Immobilized TiO2-Polyethylene Glycol: Effects of Aeration and pH of Methylene Blue Dye

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LED‐Based Ultraviolet Oxidation of Pharmaceuticals: Effects of Wavelength and Intensity, pH, and TiO₂ Loading