Present Perspectives of Advanced Characterization Techniques in TiO<sub>2</sub>-Based Photocatalysts

Luo, Chengzhi; Ren, Xiaohui; Dai, Zhigao; Zhang, Yupeng; Qi, Xiang; Pan, Chunxu

doi:10.1021/acsami.7b00496

Cited by 135 publications

(70 citation statements)

References 209 publications

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“…Various semiconductor photocatalysts such as CdS, ZnO, WO 3 , SnO 2 , and TiO 2 have been used for the photocatalytic reduction of aqueous Cr(VI) in recent years. Among them TiO 2 has extensively been investigated [62–68] due to its nontoxicity, excellent photochemical stability, great oxidizing power, chemical inertness, high abundance, low cost and environmentally friendly nature [69–72]. Moreover, photoexcited TiO 2 surfaces possess super hydrophilic properties which are evident from their excellent anti-fogging and self-cleaning abilities [73].…”

Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

111

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Cr(VI) exhibits cytotoxic, mutagenic and carcinogenic properties; hence, effluents containing Cr(VI) from various industrial processes pose threat to aquatic life and downstream users. Various treatment techniques, such as chemical reduction, ion exchange, bacterial degradation, adsorption and photocatalysis, have been exploited for remediation of Cr(VI) from wastewater. Among these, photocatalysis has recently gained considerable attention. The applications of photocatalysis, such as water splitting, CO2 reduction, pollutant degradation, organic transformation reactions, N2 fixation, etc., towards solving the energy crisis and environmental issues are briefly discussed in the Introduction of this review. The advantages of TiO2 as a photocatalyst and the importance of its modification for photocatalytic reduction of Cr(VI) has also been addressed. In this review, the photocatalytic activity of TiO2 after modification with carbon-based advanced materials, metal oxides, metal sulfides and noble metals towards reduction of Cr(VI) was evaluated and compared with that of bare TiO2. The photoactivity of dye-sensitized TiO2 for reduction of Cr(VI) was also discussed. The mechanism for enhanced photocatalytic activity was highlighted and attributed to the resultant properties, namely, effective separation of photoinduced charge carriers, extension of the light absorption range and intensity, increase of the surface active sites, and higher photostability. Advantages and limitations for photoreduction of Cr(VI) over modified TiO2 are depicted in the Conclusion. The various challenges that restrict the technology from practical applications in remediation of Cr(VI) from wastewater were addressed in the Conclusion section as well. The future perspectives of the field presented in this review are focused on the development of whole-solar-spectrum responsive, TiO2-coupled photocatalysts which provide efficient photocatalytic reduction of Cr(VI) along with their good recoverability and recyclability.

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Section: Reviewmentioning

confidence: 99%

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Acharya

Naik

Parida

2018

Beilstein J. Nanotechnol.

111

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“…A comprehensive discussion of all such techniques is out of the scope of this paper, but recent reviews on the topic can be found in the literature [32,33].…”

Section: Characterizationmentioning

confidence: 99%

Brookite: Nothing New under the Sun?

2017

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Advances in the synthesis of pure brookite and brookite-based TiO 2 materials have opened the way to fundamental and applicative studies of the once least known TiO 2 polymorph. Brookite is now recognized as an active phase, in some cases showing enhanced performance with respect to anatase, rutile or their mixture. The peculiar structure of brookite determines its distinct electronic properties, such as band gap, charge-carrier lifetime and mobility, trapping sites, surface energetics, surface atom arrangements and adsorption sites. Understanding the relationship between these properties and the photocatalytic performances of brookite compared to other TiO 2 polymorphs is still a formidable challenge, because of the interplay of many factors contributing to the observed efficiency of a given photocatalyst. Here, the most recent advances in brookite TiO 2 material synthesis and applications are summarized, focusing on structure/activity relation studies of phase and morphology-controlled materials. Many questions remain unanswered regarding brookite, but one answer is clear: Is it still worth studying such a hard-to-synthesize, elusive TiO 2 polymorph? Yes.

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“…As an n-type semiconductor, TiO 2 is an important material, which possesses good thermal and chemical stability, high oxidizing power, nontoxicity, and low cost [1]. Therefore, it is widely studied for its potential environmental applications, remarkable for the usage as photocatalyst to purify wastewater containing industry and toxic organic pollutants [2].…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation evaluation of N-Fe codoped aligned TiO2 nanorods based on the effect of annealing temperature

Sadeghzadeh‐Attar

2020

J Adv Ceram

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In this paper, a comparative study on the photocatalytic degradation of the Rhodamine B (RhB) dye as a model compound using N-Fe codoped TiO 2 nanorods under UV and visible-light (λ ≥ 420 nm) irradiations has been performed. TiO 2 photocatalysts were fabricated as aligned nanorod arrays by liquid-phase deposition process, annealed at different temperatures from 400 to 800 ℃. The effects of annealing temperature on the phase structure, crystallinity, BET surface area, and resulting photocatalytic activity of N-Fe codoped TiO 2 nanorods were also investigated. The degradation studies confirmed that the nanorods annealed at 600 ℃ composed of both anatase (79%) and rutile phases (21%) and offered the highest activity and stability among the series of nanorods, as it degraded 94.8% and 87.2% RhB in 120 min irradiation under UV and visible-light, respectively. Above 600 ℃, the photocatalytic performance of nanorods decreased owning to a phase change, decreased surface area and bandgap, and growth of TiO 2 crystallites induced by the annealing temperature. It is hoped that this work could provide precious information on the design of 1D catalyst materials with more superior photodegradation properties especially under visible-light for the further industrial applications. and 3.2 eV for rutile phase), which allows it to absorb only a small portion of sunlight corresponding to the UV region of solar spectrum. On the other hand, the recombination rate of photo-generated electron and hole pairs in TiO 2 is high [3]. Hence, these conclude the low photocatalytic efficiency of TiO 2 in the visible region. To overcome the drawback of low photocatalytic efficiency, considerable efforts have been taken, such as dimensionality reduction [4], metal and non-metal doping [5], and semiconductor coupling [6]. Onedimensional (1D) TiO 2 nanostructures, including nanobelts, nanofibers, nanorods, nanowires, and nanotubes [7][8][9][10][11] can be considered as one of good 108

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Present Perspectives of Advanced Characterization Techniques in TiO₂-Based Photocatalysts

Cited by 135 publications

References 209 publications

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Brookite: Nothing New under the Sun?

Photocatalytic degradation evaluation of N-Fe codoped aligned TiO2 nanorods based on the effect of annealing temperature

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Present Perspectives of Advanced Characterization Techniques in TiO2-Based Photocatalysts

Cited by 135 publications

References 209 publications

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO2-mediated photocatalytic reduction

Brookite: Nothing New under the Sun?

Photocatalytic degradation evaluation of N-Fe codoped aligned TiO2 nanorods based on the effect of annealing temperature

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Present Perspectives of Advanced Characterization Techniques in TiO₂-Based Photocatalysts

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction

Cr(VI) remediation from aqueous environment through modified-TiO₂-mediated photocatalytic reduction