Journal ArticleDOI
Photocatalysis: an effective tool for photodegradation of dyes—a review
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TLDR
In this article, the photocatalytic degradation of dyes follows three types of mechanisms: (1) dye sensitization through charge injection, (2) indirect dye degradation through oxidation/reduction, and (3) direct photolysis of dye.Abstract:
The disposal of dye-contaminated wastewater is a major concern around the world for which a variety of techniques are used for its treatment. The photocatalytic treatment of dye-contaminated wastewater is one of the treatment methods. Semiconductor-assisted photocatalytic treatment of dye-contaminated wastewater has gained pronounced attention recently. This review outlines the recent advancements in the photocatalytic treatment of dye-contaminated wastewater. The photocatalytic degradation of dyes follows three types of mechanisms: (1) dye sensitization through charge injection, (2) indirect dye degradation through oxidation/reduction, and (3) direct photolysis of dye. Several experimental parameters like initial concentration of dyes, pH, and catalyst dosage significantly affect the photocatalytic degradation of dyes. The photocatalytic materials can be categorized into three generations. The single-component (e.g., ZnO, TiO2) and multiple component semiconductor metal oxides (e.g., ZnO–TiO2, Bi2O3–ZnO) are categorized as first-generation and second-generation photocatalysts, respectively. The photocatalysts dispersed on an inert solid substrate (e.g., Ag–Al2O3, ZnO–C) are classified as third-generation photocatalysts. Finally, we reviewed the challenges that affect the photocatalytic degradation of dyes.read more
Citations
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Development of Bi2O3-ZnO heterostructure for enhanced photodegradation of rhodamine B and reactive yellow dyes
Misbah Yasin,Muhammad Saeed,Majid Muneer,Muhammad Ahsan Usman,Atta ul Haq,Maria Sadia,Muhammad Altaf +6 more
TL;DR: In this paper , the authors developed an efficient photocatalyst formed by coupling of p-type Bi2O3 and n-type ZnO by co-precipitation method.
Journal ArticleDOI
A Comprehensive Review on Adsorption, Photocatalytic and Chemical Degradation of Dyes and Nitro-Compounds over Different Kinds of Porous and Composite Materials
TL;DR: In this paper , a comprehensive analysis of the adsorption of dyes over different materials (porous polymer, carbon-based material, clay-based materials, layer double hydroxides, metal-organic frameworks, and biosorbents) is presented.
Journal ArticleDOI
The Effect of Mineral Ions Present in Tap Water on Photodegradation of Organic Pollutants: Future Perspectives
Shujaat Ahmad,Mazen Almehmadi,Hammad Tariq Janjuhah,George Kontakiotis,Osama Abdulaziz,Khalid Saeed,Hanif Ahmad,M. Allahyani,Abdulelah Aljuaid,Ahad A Alsaiari,Juma Muhammad,Idrees Matthew Khan +11 more
TL;DR: In this paper , the authors evaluated the effect of tap water on the photo-degradation of organic pollutants such as dyes, pharmaceutical products, pesticides, etc., with the support of the literature.
Journal ArticleDOI
Co3O4-Bi2O3 heterojunction: An effective photocatalyst for photodegradation of rhodamine B dye
Muhittin Ugurlu,Terence Tao +1 more
TL;DR: The Co3O4-Bi2O3 heterojunction was synthesized by the coprecipitation method and characterized by XRD, EDS, SEM, TEM, TGA, and FTIR as mentioned in this paper .
Journal ArticleDOI
A review on algae biosorption for the removal of hazardous pollutants from wastewater: Limiting factors, prospects and recommendations.
TL;DR: In this article , the authors provide a comprehensive definition of the future possibilities in heavy compound decomposition by using algal technology, from aggregation to numerous biosorption procedures, and further highlight the limiting factors of algal bio-sorption to eliminate the hazardous material.
References
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Journal ArticleDOI
Electrochemical Photolysis of Water at a Semiconductor Electrode
Akira Fujishima,Kenichi Honda +1 more
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.
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A review and recent developments in photocatalytic water-splitting using TiO2 for hydrogen production
TL;DR: In this article, the up-to-date development of the above-mentioned technologies applied to TiO 2 photocatalytic hydrogen production is reviewed, based on the studies reported in the literature, metal ion-implantation and dye sensitization are very effective methods to extend the activating spectrum to the visible range.
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Semiconductor heterojunction photocatalysts: design, construction, and photocatalytic performances
Huanli Wang,Lisha Zhang,Zhigang Chen,Junqing Hu,Shijie Li,Zhaohui Wang,Jianshe Liu,Xinchen Wang +7 more
TL;DR: This review attempts to summarize the recent progress in the rational design and fabrication ofheterojunction photocatalysts, such as the semiconductor-semiconductor heterojunction, the semiconductors-metal heterojunctions, the silicon-carbon heteroj junction and the multicomponent heteroj conjunction.
Journal ArticleDOI
Heterogeneous photocatalytic degradation of organic contaminants over titanium dioxide : A review of fundamentals, progress and problems
TL;DR: A review of the use of the TiO 2 photocatalyst for remediation and decontamination of wastewater, report the recent work done, important achievements and problems is presented in this paper, however, a lot more is needed from engineering design and modelling for successful application of the laboratory scale techniques to large scale operation.
Journal ArticleDOI
Graphene-based semiconductor photocatalysts
TL;DR: This critical review summarizes the recent progress in the design and fabrication of graphene-based semiconductor photocatalysts via various strategies including in situ growth, solution mixing, hydrothermal and/or solvothermal methods.