scholarly journals An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

2011 ◽  
Vol 2011 ◽  
pp. 1-18 ◽  
Author(s):  
Yong Nian Tan ◽  
Chung Leng Wong ◽  
Abdul Rahman Mohamed
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Doping Concentration ◽  
Anatase Phase ◽  
High Specific Surface Area ◽  
Operating Parameters ◽  
Photocatalytic Efficiency ◽  
Small Crystallite Size ◽  
Initial Reactant ◽  
Small Crystallite

This paper aims to review and summarize the recent works on the photocatalytic degradation of various organic pollutants in the presence of nano-doped-TiO2 photocatalysts. In this regard, three main aspects are examined: (a) the presence of various dopants (metal dopants, nonmetal dopants, halogen dopants, metalloid dopants, and codopants) in the formation of nano-doped-TiO2 photocatalysts, (b) the effect of the presence of dopants on the photocatalytic degradation of organic pollutants, and (c) the effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO2 photocatalysts. Reports resulted suggest that the formation of a high percentage of the anatase phase, small crystallite size, and high specific surface area of the nano-doped-TiO2 photocatalysts depends on the presence of various dopants in the photocatalysts. The majority of the dopants have the potential to improve the photocatalytic efficiency of nano-doped-TiO2 in the degradation of organic pollutants. The photocatalytic degradation of organic compounds depends on the calcination temperature of the prepared doped TiO2, initial reactant concentration, dosage of doped TiO2, and dopant doping concentration.

Immobilization of PDMS-SiO2-TiO2 composite for the photocatalytic degradation of dye AO-7

2016 ◽  
Vol 74 (7) ◽  
pp. 1680-1688 ◽  
Author(s):  
Feigao Xu ◽  
Wencheng Tan ◽  
Heng Liu ◽  
Dan Li ◽  
Yuexiang Li ◽  
...  
Keyword(s):  
Thin Film ◽  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Fixed Bed ◽  
Hydrophobic Surface ◽  
Fixed Bed Reactor ◽  
Photocatalytic Efficiency ◽  
Pumice Stone ◽  
Degradation Effect

Crack-free PDMS-SiO2-TiO2 composite as photocatalyst was prepared for degrading dyes by using thin-film fixed bed reactor. The hydrophobic surface of the photocatalyst loaded with PDMS-SiO2-TiO2 composite could be considered as an extractant for organic pollutants. The effect of different supports including pumice stone, medicinal stone, and fiberglass for photocatalytic efficiency were compared. Under the same condition, it was found that the photocatalytic degradation effect of dyes was best when PDMS-SiO2-TiO2 composite was fixed on pumice stone rather than medicinal stone or fiberglass. Furthermore, when pumice stone was used as the support for PDMS-SiO2-TiO2 composite, the photocatalytic degradation effect of dyes hardly decreased after five cycles.

Preparation of Mesoporous TiO2 Thin Films and Research on Ultraviolet Photolysis Degradation of Dioxins from MSW Ash

2012 ◽  
Vol 490-495 ◽  
pp. 3440-3443
Author(s):  
Lan Wang ◽  
Yong Luo ◽  
Jun Ling Ren
Keyword(s):  
Thin Films ◽  
Molecular Weight ◽  
Photocatalytic Degradation ◽  
Anatase Phase ◽  
Tetrabutyl Titanate ◽  
Photocatalytic Efficiency ◽  
Degradation Study ◽  
Ultraviolet Photolysis

Mesoporous TiO2thin films have been prepared with so1-ge1 method by using tetrabutyl titanate(TBT) as precursor and PEG (Molecular weight 3000)as template．The XRD spectrum of the samples of the thin films indicated that the sample crystallized into anatase phase under the 500°C．And the photocatalytic degradation study of dioxins from MSW ash had been carried out. The result showed that the Mesoporous TiO2thin films with anatase phase had high photocatalytic efficiency and was in favor of the regeneration and reuse.

Photocatalytic Degradation of Organic Pollutants by Using Nanocrystalline Boron‐doped TiO 2 Catalysts

2021 ◽  
Vol 6 (14) ◽  
pp. 3360-3369
Author(s):  
Rani P. Barkul ◽  
Radhakrishna S. Sutar ◽  
Meghshyam K. Patil ◽  
Sagar D. Delekar
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Pollutants ◽  
Boron Doped

scholarly journals ZnO Nanoparticles with Controllable Ce Content for Efficient Photocatalytic Degradation of MB Synthesized by the Polyol Method

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 71
Author(s):  
Gregorio Flores-Carrasco ◽  
Micaela Rodríguez-Peña ◽  
Ana Urbieta ◽  
Paloma Fernández ◽  
María Eugenia Rabanal
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Degradation ◽  
Doping Concentration ◽  
Polyol Method ◽  
Transmission Microscopy ◽  
Uv Illumination ◽  
Transmission Electron ◽  
Optical Luminescence ◽  
Pl Emission ◽  
Ce Content

This paper reports on the synthesis of Ce-doped ZnO (CZO) nanoparticles (NPs) by an alternative polyol method at low temperature. The method, facile and rapid, uses acetate-based precursors, ethylene glycol as solvent, and polyvinylpyrrolidone as capping agent. The effects of the Ce-doping concentration (ranging from 0 to 8.24 atomic%) on the structural, morphological, compositional, optical, luminescence, and photocatalytic properties of the NPs were investigated by several techniques. The structural findings confirmed that the CZO NPs have a typical hexagonal wurtzite-type structure with a preferred orientation along the (101) plane. The results obtained by Field Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM) revealed that the NPs size decreased (from ~30 to ~16 nm) with an increase in the Ce-doping concentration. Energy Dispersive X-Ray Spectroscopy (EDS) and High Resolution Transmission Microscopy (HRTEM) results confirmed the incorporation of Ce ions into the ZnO lattice. Ce-doping influences the photoluminescence (PL) emission compared to that of pure ZnO. The PL emission is related to the presence of different kinds of defects, which could take part in charge transfer and/or trapping mechanisms, hence playing an essential role in the photocatalytic activity (PCA). In fact, in this work we report an enhancement of PCA as a consequence of Ce-doping. In this sense, the best results were obtained for samples doped with 3.24 atomic%, that exhibited a photocatalytic degradation efficiency close to 99% after 60 min ultraviolet (UV) illumination, thus confirming the viability of Ce-doping for environmental applications.

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