Heterogeneous photocatalyzed degradation of uracil and 5-bromouracil in aqueous suspensions of titanium dioxide

Singh, Hemant Kumar; Saquib, M.; Haque, M.M.; Muneer, M.

doi:10.1016/j.jhazmat.2006.08.038

Cited by 27 publications

(16 citation statements)

References 21 publications

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“…The efficiency of photocatalysts was shown to follow the order: P25 > UV100 > PC500 > TTP for the degradation of various pesticides and herbicides derivatives (Singh et al, 2003(Singh et al, , 2007a(Singh et al, , 2007bSingh and Muneer, 2004;Muneer, 2005a, 2005b;Qamar and Muneer, 2005). The differences in the photocatalytic activity are likely to be related to the differences in the BET surface, impurities, lattice mismatches or density of hydroxyl groups on the catalyst's surface, since these factors could affect the adsorption behaviour of a pollutant or intermediate molecule and the life time and recombination rate of electronehole pairs (Bahnemann et al, 2007;Singh et al, 2007aSingh et al, , 2007bSingh et al, , 2007cMuneer, 2005a, 2005b;Qamar and Muneer, 2005;Munner and Bahnemann, 2002). Swarnalatha and Anjaneyulu (2004) compared the photocatalytic efficiency of P25, TiO 2 (Merck), ZnO, CdS and WO 3 for photocatalytic degradation of 1 Â 10 À4 M 2,6-dinitrophenol(2,4-DNP).…”

Section: Types and Composition Of Photocatalystmentioning

confidence: 99%

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Ahmed

Rasul

Brown

et al. 2011

Journal of Environmental Management

749

316

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In recent years, the application of heterogeneous photocatalytic water purification processes has gained wide attention due to its effectiveness in degrading and mineralizing the recalcitrant organic compounds as well as the possibility of utilizing the solar UV and visible-light spectrum. This paper aims to review and summarize the recent works on the titanium dioxide (TiO(2)) photocatalytic oxidation of pesticides and phenolic compounds, predominant in storm and wastewater effluents. The effects of various operating parameters on the photocatalytic degradation of pesticides and phenols are discussed. Results reported here suggest that the photocatalytic degradation of organic compounds depends on the type and composition of the photocatalyst and, light intensity, initial substrate concentration, amount of catalyst, pH of the reaction medium, ionic components in water, solvent types, oxidizing agents/electron acceptors, catalyst application mode, and calcination temperature in the water environment. A substantial amount of research has focused on the enhancement of TiO(2) photocatalysis by modification with metal, non-metal and ion doping. Recent developments in TiO(2) photocatalysis for the degradation of various pesticides and phenols are also highlighted in this review. It is evident from the literature survey that photocatalysis has good potential to remove a variety of organic pollutants. However, there is still a need to determine the practical utility of this technique on a commercial scale.

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Section: Types and Composition Of Photocatalystmentioning

confidence: 99%

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Ahmed

Rasul

Brown

et al. 2011

Journal of Environmental Management

749

316

View full text Add to dashboard Cite

show abstract

“…The oxidants not only prevent the recombination of electron/hole by acquiring the electron from the conduction band, but also promote the production of more oxidizing species and hydroxyl radicals, thereby improving the degradation rate (Singh et al, 2007a(Singh et al, , 2007b(Singh et al, , 2007c. In our study, to determine the optimum concentration of oxidant (H 2 O 2 ), it was varied from 0.05 to 0.3 mL/200 mL at the optimized dose of TiO 2 0.75 gL -1 and pH 4.…”

Section: Effect Of Oxidant Additionmentioning

confidence: 99%

Heterogeneous photo-Fenton and photocatalytic degradation studies of 2-chloro-4-nitrophenol (2Cl4NP) using foundry sand and TiO2 coated cement/clay beads

Aggarwal

Verma

Bansal

et al. 2017

Braz. J. Chem. Eng.

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-Cement and clay beads coated with TiO 2 were used for the photo-degradation and mineralization of 2-chloro-4-nitrophenol (2Cl4NP) along with a heterogeneous solar photo-Fenton process using foundry sand (FS) as the iron source. The degradation process was optimized using slurry photocatalysis where 96% degradation of 2Cl4NP was achieved in 120 min at optimized conditions of C0=50 mgL -1 , pH=4, 0.75 gL -1 TiO 2 and H 2 O 2 = 0.1 mL/200 mL. Degradation of 2Cl4NP was analyzed through HPLC along with UV-Visible spectrophotometer at 266 nm. The degradation of 68% and 52% of 2Cl4NP was attained in fixed-bed photocatalysis using cement and clay beads, respectively. The durability studies of cement and clay beads were carried out in terms of number of recycles. 97.19% degradation was obtained in a solar photo-Fenton process after 105 min at pH=3. Complete mineralization of 2Cl4NP was confirmed through reduction in COD along with the disappearance of the parent compound peak in HPLC chromatograms.

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“…Superoxide radicals often result from the interplay between the photogenerated electrons (e − CB ) and molecular oxygen. The addition of peroxides increases the occurrence of reaction (4) and the presence of hydroxyl radicals, thereby increasing the degradation kinetics [33][34][35].…”

Section: Photo-degradation Of Momentioning

confidence: 99%

Photocatalytic degradation of methyl orange using polymer–titania microcomposites

Coutinho

Gupta

2009

Journal of Colloid and Interface Science

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Heterogeneous photocatalyzed degradation of uracil and 5-bromouracil in aqueous suspensions of titanium dioxide

Cited by 27 publications

References 21 publications

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Influence of parameters on the heterogeneous photocatalytic degradation of pesticides and phenolic contaminants in wastewater: A short review

Heterogeneous photo-Fenton and photocatalytic degradation studies of 2-chloro-4-nitrophenol (2Cl4NP) using foundry sand and TiO2 coated cement/clay beads

Photocatalytic degradation of methyl orange using polymer–titania microcomposites

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