Evaluation of nano-titanium dioxide (TiO2) catalysts for ultraviolet photocatalytic oxidation air cleaning devices

Aghighi, Alireza; Haghighat, Fariborz

doi:10.1016/j.jece.2015.05.019

Cited by 22 publications

(1 citation statement)

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“…A desirable coating technique should have the following requirements: a) a durable and stable coating; b) an efficient and appropriate contact between the catalyst and the contaminant; c) be non-selective for different substrates; and d) be cost-effective and suitable for large-scale application [153]. Generally, the dip coating and spray coating are used for immobilizing TiO 2 on the catalyst support [6,40,154]. Dip coating forms a thin and controllable layer, while spray coating may be used to create a thicker layer [59].…”

Section: Stabilization By Support Structurementioning

confidence: 99%

TiO2 photocatalyst for removal of volatile organic compounds in gas phase – A review

Shayegan

Lee

Haghighat

2018

Chemical Engineering Journal

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772

282

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Heterogeneous photocatalytic oxidation process (PCO) is a promising technology for removing indoor volatile organic compounds (VOCs) contaminants. Titanium dioxide (TiO 2 ) has been regarded as the most suitable photocatalyst for its cost effectiveness, high stability and great capability to degrade various VOCs. However, no TiO 2 -based photocatalysts completely satisfy all practical requirements given photoexcited charge carriers' short lifetime and a wide band gap requiring ultraviolet (UV) radiation. Strategies for improving TiO 2 photocatalyst activities by doping with different metal and/or non-metal ions and by coupling with other semiconductors have been examined and reported. These techniques can improve PCO performance through the following mechanisms: i) by introducing an electron capturing level in the band gap that would generate some defects in the TiO 2 lattice and help capture charge carriers; ii) by slowing down the charge carrier recombination rate and increasing VOCs degradation. This paper reports the outcomes of a comprehensive literature review of TiO 2 modification techniques that include approaches for overcoming the inherent TiO 2 limitations and improving the photocatalytic degradation of VOCs. Accordingly, it focuses on the recent development of modified-TiO 2 used for degrading gas phase pollutants in ambient conditions. Modification techniques, such as metal and non-metal doping, co-doping, and the heterojunction of TiO 2 with other semiconductors, are reviewed. A brief introduction on the basics of photocatalysis and the effects of controlling parameters is presented, followed by a discussion about TiO 2 photocatalyst modification for gas phase applications. The reported experimental results obtained with PCO for eliminating VOCs are also compiled and evaluated.

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