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Journal ArticleDOI

Recent Developments in Photocatalytic Water Treatment Technology: A Review

01 May 2010-Water Research (Water Res)-Vol. 44, Iss: 10, pp 2997-3027
TL;DR: For the first time, a multi-variables optimization approach is described to determine the optimum operation parameters so as to enhance process performance and photooxidation efficiency in the photocatalytic water treatment process.
About: This article is published in Water Research.The article was published on 2010-05-01. It has received 4293 citations till now. The article focuses on the topics: Waste disposal & Water treatment.
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TL;DR: This article reviews state-of-the-art research activities in the field, focusing on the scientific and technological possibilities offered by photocatalytic materials, and highlights crucial issues that should be addressed in future research activities.
Abstract: Semiconductor photocatalysis has received much attention as a potential solution to the worldwide energy shortage and for counteracting environmental degradation. This article reviews state-of-the-art research activities in the field, focusing on the scientific and technological possibilities offered by photocatalytic materials. We begin with a survey of efforts to explore suitable materials and to optimize their energy band configurations for specific applications. We then examine the design and fabrication of advanced photocatalytic materials in the framework of nanotechnology. Many of the most recent advances in photocatalysis have been realized by selective control of the morphology of nanomaterials or by utilizing the collective properties of nano-assembly systems. Finally, we discuss the current theoretical understanding of key aspects of photocatalytic materials. This review also highlights crucial issues that should be addressed in future research activities.

3,265 citations

Journal ArticleDOI
TL;DR: In this paper, the fundamental mechanism of heterogeneous photocatalysis, advantages, challenges and the design considerations of g-C3N4-based photocatalysts are summarized, including their crystal structural, surface phisicochemical, stability, optical, adsorption, electrochemical, photoelectrochemical and electronic properties.

2,132 citations

Journal ArticleDOI
TL;DR: Recent development in nanotechnology for water and wastewater treatment is reviewed, covering candidate nanomaterials, properties and mechanisms that enable the applications, advantages and limitations as compared to existing processes, and barriers and research needs for commercialization.

1,744 citations

Journal ArticleDOI
TL;DR: This paper presents a critical review of recent achievements in the modification of ZnO photocatalyst for organic contaminants degradation and recommends improvements in the heterogeneous photocatalysis under UV/visible/solar illumination.

1,646 citations

Journal ArticleDOI
TL;DR: This review outlined the latest applications of iron oxide nanomaterials in wastewater treatment, and gaps which limited their large-scale field applications, as well as the outlook for potential applications and further challenges.

1,632 citations


Cites background from "Recent Developments in Photocatalyt..."

  • ...…and groundwater has become a critical issue worldwide, due to population growth, rapid development of industrialization and long-term droughts (Cundy et al., 2008; Chong et al., 2010; Zeng et al., 2011). tal Science and Engineering, 86 731 88822754; fax: +86 huangdanlian@hnu.edu.cn rights reserved....

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References
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Journal ArticleDOI
07 Jul 1972-Nature
TL;DR: Water photolysis is investigated by exploiting the fact that water is transparent to visible light and cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm.
Abstract: ALTHOUGH the possibility of water photolysis has been investigated by many workers, a useful method has only now been developed. Because water is transparent to visible light it cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm (ref. 1).

27,819 citations


"Recent Developments in Photocatalyt..." refers background in this paper

  • ...Since the discovery of photocatalytic effect on water splitting by Fujishima and Honda (1972) using TiO2 electrode, numerous researches have evolved to synthesis TiO2 catalyst of different scale, characterise its physical properties and determine its photooxidation performances to the…...

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  • ...…to synthesis TiO2 catalyst of different scale, characterise its physical properties and determine its photooxidation performances to the surfaceoriented nature of photocatalysis reaction (Fujishima and Honda, 1972; Kondo et al., 2008; Hosono et al., 2004; Joo et al., 2005; Wang et al., 1999)....

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Journal ArticleDOI
Ryoji Asahi1, Takeshi Morikawa1, T. Ohwaki1, Koyu Aoki1, Y. Taga1 
13 Jul 2001-Science
TL;DR: Film and powders of TiO2-x Nx have revealed an improvement over titanium dioxide (TiO2) under visible light in optical absorption and photocatalytic activity such as photodegradations of methylene blue and gaseous acetaldehyde and hydrophilicity of the film surface.
Abstract: To use solar irradiation or interior lighting efficiently, we sought a photocatalyst with high reactivity under visible light. Films and powders of TiO 2- x N x have revealed an improvement over titanium dioxide (TiO 2 ) under visible light (wavelength 2 has proven to be indispensable for band-gap narrowing and photocatalytic activity, as assessed by first-principles calculations and x-ray photoemission spectroscopy.

11,402 citations


"Recent Developments in Photocatalyt..." refers background in this paper

  • ...The mechanism of such transition and non-metals doping, however, is different from the noble metals coupling as the TiO2 is incorporated into the TiO2 crystal lattice (Asahi et al., 2001; Irie et al., 2003; Ihara et al., 2003)....

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Journal ArticleDOI
Ulrike Diebold1
TL;DR: Titanium dioxide is the most investigated single-crystalline system in the surface science of metal oxides, and the literature on rutile (1.1) and anatase surfaces is reviewed in this paper.

7,056 citations

Journal ArticleDOI
TL;DR: A review of the current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy is discussed in this paper.
Abstract: Scientific studies on photocatalysis started about two and a half decades ago. Titanium dioxide (TiO 2 ), which is one of the most basic materials in our daily life, has emerged as an excellent photocatalyst material for environmental purification. In this review, current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy are discussed together with some fundamental aspects. A novel photoinduced superhydrophilic phenomenon involving TiO 2 and its applications are presented.

6,802 citations


"Recent Developments in Photocatalyt..." refers background in this paper

  • ...Fujishima et al. (2000) indicated the initiation of TiO2 photocatalysis reaction rates is not highly dependent on light intensity, where a few photons of energy (i.e. as low as 1 mW cm 1) can sufficiently induce the surface reaction....

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  • ...The fundamentals of photophysics and photochemistry underlying the heterogeneous photocatalysis employing the semiconductor TiO2 catalyst have been intensively reported in many literatures (Gaya and Abdullah, 2008; Fujishima et al., 2000)....

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01 Jan 2008
TL;DR: A review of the current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy is discussed in this article.
Abstract: Abstract Scientific studies on photocatalysis started about two and a half decades ago. Titanium dioxide (TiO 2 ), which is one of the most basic materials in our daily life, has emerged as an excellent photocatalyst material for environmental purification. In this review, current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy are discussed together with some fundamental aspects. A novel photoinduced superhydrophilic phenomenon involving TiO 2 and its applications are presented.

6,294 citations