Quantum yield study of the photodegradation of hydrophobic dyes in the presence of acetone sensitizer

Tsui, S. M.; Chu, Wei

doi:10.1016/s0045-6535(00)00379-9

Cited by 34 publications

(15 citation statements)

References 13 publications

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“…Therefore, the dye structure becomes chemically stable at high pH ranges. The chromophores of the dye remain intact after light irradiation and hence reduce the degradation rate of the dye (Tsui and Chu 2001). Hence, the changes in the behavior of the dye molecule may be responsible for the change in the percentage degradation of dye at higher pH.…”

Section: Effect Of Phmentioning

confidence: 99%

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015

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Traditional chemical, physical and biological processes for treating wastewater containing textile dye have such disadvantages as high cost, high energy requirement and generation of secondary pollution during treatment process. The advanced oxidation processes technology has been attracting growing attention for the decomposition of organic dyes. Such processes are based on the light-enhanced generation of highly reactive hydroxyl radicals, which oxidize the organic matter in solution and convert it completely into water, CO 2 and inorganic compounds. In this presentation, the photocatalytic degradation of dyes in aqueous solution using TiO 2 as photocatalyst under solar and UV irradiation has been reviewed. It is observed that the degradation of dyes depends on several parameters such as pH, catalyst concentration, substrate concentration and the presence of oxidants. Reaction temperature and the intensity of light also affect the degradation of dyes. Particle size, BETsurface area and different mineral forms of TiO 2 also have influence on the degradation rate.

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Section: Effect Of Phmentioning

confidence: 99%

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

2015

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“…The quantum yield is a useful parameter indicating the efficiency of a photooxidation reaction, and is defined as the number of molecules being decomposed per photon absorbed [17]: ϕ = number of molecules reacted (or produced) number of photons of light absorbed (16) The quantum yield of BY2 degradation can be calculated from the observed first-order degradation rate constant where a specific form of quantum yield, ϕ based on first-order kinetics was indicated in the following [18]:…”

Section: Comparison Of the Quantum Yield For Both Direct Photolysis Amentioning

confidence: 99%

The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

Salari

Niaei

Aber

et al. 2009

Journal of Hazardous Materials

141

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The photooxidative decolorization of C.I. Basic Yellow 2 (BY2), was investigated using UV radiation in the presence of peroxydisulfate (S(2)O(8)(2-)) in a rectangular photoreactor at experimental condition. S(2)O(8)(2-) and UV-light showed negligible effect when they were used independently. Removal efficiency of BY2 was sensitive to the operational parameters such as initial concentrations of S(2)O(8)(2-), BY2, light intensity, flow rate and pH. The conversion ratios of BY2 at the volumetric flow rates of 330, 500 and 650 ml/min were 84%, 79%, 51% in 30 min, respectively. Our results showed that light intensity was a beneficial parameter for dye removal. The results showed that in the presence of S(2)O(8)(2-), the photooxidation quantum yield obtained was higher than direct photolysis quantum yield, suggesting that photodecay of BY2 was dominated by photooxidation. The electrical energy per order (E(EO)) values for decolorization of BY2 solution was calculated. Results show that applying a desired peroxydisulfate concentration can reduce the E(EO).

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“…The photochemical reduction of A1 in the acetonitrile-alcohol mixtures is enhanced on addition of benzophenone (<1 mM), acetophenone (5 mM) or acetone (0.3 M). It should be noted that the quantum yield of reduction of A1 in acetone-water (1:1, vol) is U d = 0.06 at pH 3-11 [26]. The observed U H 2 values under sensitized conditions (Table 4) are much larger and only little smaller than unity, the maximum attainable value.…”

Section: Photoreduction Of Amino(methyl)aqsmentioning

confidence: 81%

“…The low reactivity of aminoAQs is ascribed to a charge transfer process, leading to fast deactivation into the ground state. The photoprocesses of aminoAQs have been extensively studied [4,[18][19][20][21], but concerning the reactions of nitroAQs only little is known [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Direct and ketone-sensitized photoconversion of 1-nitro-9,10-anthraquinone to 1-amino-9,10-anthraquinone mediated by donor radicals

Görner

Gruen

2010

Chemical Physics

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Quantum yield study of the photodegradation of hydrophobic dyes in the presence of acetone sensitizer

Cited by 34 publications

References 13 publications

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

Parameters affecting the photocatalytic degradation of dyes using TiO2: a review

The photooxidative destruction of C.I. Basic Yellow 2 using UV/S2O82− process in a rectangular continuous photoreactor

Direct and ketone-sensitized photoconversion of 1-nitro-9,10-anthraquinone to 1-amino-9,10-anthraquinone mediated by donor radicals

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