Synthesizing mixed-phase TiO2 nanocomposites using a hydrothermal method for photo-oxidation and photoreduction applications

Li, Gonghu; Ciston, Shannon; Šaponjić, Zoran; Chen, Le; Dimitrijević, Nada M.; Rajh, Tijana; Gray, Kimberly A.

doi:10.1016/j.jcat.2007.10.014

Cited by 204 publications

(140 citation statements)

References 33 publications

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“…Among the studies on the mixed-phase TiO 2 , anataserich anatase/rutile is more active than pure anatase or rutile for CO 2 photoreduction (Li et al, 2008b;Wang et al, 2012a). The enhanced activity of anatase/rutile mixture compared with single phase anatase or rutile was primarily attributed to the effective charge separation and transfer occurring between anatase and rutile.…”

Section: Effect Of Crystal Phasementioning

confidence: 99%

“…In order to overcome the above limitations, several approaches have been attempted to modify TiO 2 , including the incorporation of TiO 2 with noble metals (Koci et al, 2010;Li et al, 2012;Wang et al, 2012b) , metal oxides (Tseng et al, 2002(Tseng et al, , 2004Slamet et al, 2005;Li et al, 2010;Liu et al, 2013b), and nonmetals (Varghese et al, 2009;Li et al, 2012;Zhang et al, 2011;Zhang et al, 2012), the dispersion of TiO 2 on high surface area supports Srinivas et al, 2011;Wang et al, 2011b;Zhao et al, 2012b), and the control of TiO 2 with different morphologies and crystal phases (DeSario et al, 2011;Jiao et al, 2012a;Li et al, 2008b;Liu et al, 2012b).…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Liu

2014

Aerosol Air Qual. Res.

297

213

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Recently, there has been an increasing interest in the research of photocatalytic reduction of CO 2 with H 2 O, an innovative way to simultaneously reduce the level of CO 2 emissions and produce renewable and sustainable fuels. Titanium dioxide (TiO 2 ) and modified TiO 2 composites are the most widely used photocatalysts in this application; however, the reaction mechanism of CO 2 photoreduction on TiO 2 photocatalysts is still not very clear, and the reaction intermediates and product selectivity are not well understood. This review aims to summarize the recent advances in the exploration of reaction mechanism of CO 2 photoreduction with H 2 O in correlation with the TiO 2 photocatalyst characteristics. Discussions are provided in the following sections: (1) CO 2 adsorption, activation and dissociation on TiO 2 photocatalyst; (2) mechanism and approaches to enhance charge transfer from photocatalyst to reactants (i.e., CO 2 and H 2 O); and (3) surface intermediates, reaction pathways, and product selectivity. In each section, the effects of material properties are discussed, including TiO 2 crystal phases (e.g., anatase, rutile, brookite, or their mixtures), surface defects (e.g., oxygen vacancy and Ti 3+) and material modifications (e.g., incorporation of noble metal, metal oxide, and/or nonmetal species to TiO 2 ). Finally, perspectives on future research directions and open issues to be addressed in CO 2 photoreduction are outlined in this review paper.

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Section: Effect Of Crystal Phasementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Liu

2014

Aerosol Air Qual. Res.

297

213

View full text Add to dashboard Cite

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“…Some workers (Hurum et al, 2003;Ohno et al, 2003;Li et al, 2008;Chen et al, 2015) have argued that a phase junction exists between anatase and rutile particles that acts to enhance the photocatalytic activity of TiO2, compared to the pure anatase or pure rutile materials. The idea is that efficient electron-hole separation is facilitated between the two phases, allowing for enhanced lifetimes of electrons and holes.…”

Section: Discussionmentioning

confidence: 99%

Optimized Nanostructured TiO2 Photocatalysts

2016

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Titania is the most widely studied photocatalyst. In its mixed-phase configuration ( anatase-rutile form) -as manifested in the commercially available P25 Degussa materialtitania was previously found to exhibit the best photocatalytic properties reported for the pure system. A great deal of published research by various workers in the field has not fully explained the underlying mechanism for the observed behavior of mixed-phase titania photocatalysts. One of the prevalent hypotheses in the literature that is tested in this work involves the presence of small, active clusters of interwoven anatase and rutile crystallites or "catalytic 'hot-spots'." Therefore, non-woven nanofibrous mats of titania were produced, and upon calcination, the mats consisted of nanostructured fibers with different anatase-rutile ratios. By assessing the photocatalytic and photoelectrochemical properties of these samples, the optimized photocatalyst was determined. This consisted of TiO2 nanostructures annealed at 500°C with an anatase/rutile content of 90/10. Since the performance of this material exceeded that of P25 complete structural characterization was employed to understand the catalytic mechanism involved. It was determined that the dominant factors controlling the photocatalytic behavior of the titania system are the relative particle size of the different phases of titania and the growth of rutile laths on anatase grains which allow for rapid electron transfer between the two phases. This explains how to optimize the response of the pure system.

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“…RuO 2 may act as a co-catalyst and assist for the better photocatlytic activity of the TiO 2 [22]. The MO and AO are very stable organic dyes which are extensively used in the pigmentation of textile, leather, paper, cosmetic, ink, ceramic and food-processing products, and high resistant to biodegradation [23][24][25]. To reduce the environmental problems caused by these dyes, the degradation of such dye molecules into some simple non-toxic molecules is very important.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of dyes by a novel TiO2/u-RuO2/GNS nanocatalyst derived from Ru/GNS after its use as a catalyst in the aerial oxidation of primary alcohols (GNS = graphene nanosheets)

Gopiraman

Babu

Kim

et al. 2015

Reac Kinet Mech Cat

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Ruthenium nanoparticles (RuNPs) supported on graphene nanosheets (GNS) composite (Ru/GNS) was prepared by dry synthesis method and was used as a nanocatalyst for the aerial oxidation of various primary alcohols. The Ru/GNS was highly efficient, selective, stable and heterogeneous in nature. Owing to the high stability of the used catalyst (u-Ru/GNS), it was further applied in a different catalytic system viz photocatalytic degradation, after suitable modifications. We have obtained a novel TiO 2 /u-RuO 2 /GNS catalyst from u-Ru/GNS by sol-gel method. The catalytic activity of TiO 2 /u-RuO 2 /GNS toward the photodegradation of methyl orange (MO) and acridine orange (AO) was found to be an excellent. Overall, the sustainable use of these recyclable materials (Ru/GNS and TiO 2 /u-RuO 2 /GNS) could lead to economic and environmental benefits.

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Synthesizing mixed-phase TiO2 nanocomposites using a hydrothermal method for photo-oxidation and photoreduction applications

Cited by 204 publications

References 33 publications

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Understanding the Reaction Mechanism of Photocatalytic Reduction of CO2 with H2O on TiO2-Based Photocatalysts: A Review

Optimized Nanostructured TiO2 Photocatalysts

Photodegradation of dyes by a novel TiO2/u-RuO2/GNS nanocatalyst derived from Ru/GNS after its use as a catalyst in the aerial oxidation of primary alcohols (GNS = graphene nanosheets)

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