Does hydrogen peroxide really accelerate TiO2 UV-C photocatalyzed decolouration of azo-dyes such as Reactive Orange 16?

Egerton, Terry A.; Purnama, Herry

doi:10.1016/j.dyepig.2013.10.019

Cited by 23 publications

(12 citation statements)

References 34 publications

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“…In addition, a decrease in discoloration efficiency with higher photocatalyst loading may be due to the deactivation of collision-activated molecules with ground-state molecules [53,54]. This implies that not only is the amount of catalyst important, but also that other factors have an influence on the generation of radicals in solution [55,56]. Similar behavior of the Pal/photocatalysis of dyes was also observed by Stathatos et al [42] in the degradation of azo dye Basic Blue 41, using TiO 2 /palygorskite for the degradation of methylene blue.…”

Section: Photocatalytic Assaysmentioning

confidence: 99%

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Miranda

Viana²,

Honorio³

et al. 2020

Minerals

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Titanium and zirconium oxides (TiO2 and ZrO2, respectively) were obtained from alkoxides hydrolyses, and then deposited into palygorskite clay mineral (Pal) to obtain new materials for photocatalytic applications. The obtained materials were characterized by structural, morphological, and textural techniques. X-ray diffraction (XRD) results confirmed the characteristic peaks of oxides and clay transmission electron microscopy (TEM) and scanning electron microscopy (SEM) images of the modified palygorskite with both oxides showed that the clay was successfully modified by the proposed method. The increase in the specific surface area of the clay occurred when TiO2 and ZrO2 were deposited on the surface. The photocatalytic activity of these materials was investigated using the Remazol Blue anion dye under UV light. The evaluated systems presented high photocatalytic activity, reaching approximately 98% of dye discoloration under light. Thus, TiO2–Pal and ZrO2–TiO2–Pal are promising clay mineral-based photocatalysts.

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Section: Photocatalytic Assaysmentioning

confidence: 99%

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Miranda

Viana²,

Honorio³

et al. 2020

Minerals

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“…These methods have significant disadvantages such as incomplete color removal, production of harmful side products, efficacy only in low concentration, expense and high energy requirement. Of late, practically sound advanced oxidation processes (AOPs) came into existence which include Fenton 18 19 , photo-Fenton 20 , ozonization 21 , TiO 2 photocatalysis 22 23 , photolysis using H 2 O 2 24 25 and O 3 26 etc. One of the highly promising and cost effective AOPs is the use of TiO 2 (anatase), a semiconductor catalyst under UV radiation for the mineralization of organic pollutants 27 .…”

mentioning

confidence: 99%

Synthesis of Tunable Band Gap Semiconductor Nickel Sulphide Nanoparticles: Rapid and Round the Clock Degradation of Organic Dyes

Molla

Sahu

Hussain

2016

Sci Rep

116

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Controlled shape and size with tuneable band gap (1.92–2.41 eV), nickel sulphide NPs was achieved in presence of thiourea or thioacetamide as sulphur sources with the variations of temperature and capping agents. Synthesized NPs were fully characterized by powder XRD, IR, UV-vis, DRS, FE-SEM, TEM, EDX, XPS, TGA and BET. Capping agent, temperature and sulphur sources have significant role in controlling the band gaps, morphology and surface area of NPs. The catalytic activities of NPs were tested for round the clock (light and dark) decomposition of crystal violet (CV), rhodamine B (RhB), methylene blue (MB), nile blue (NB) and eriochrome black T (EBT). Agitation speed, temperature, pH and ionic strength have significant role on its catalytic activities. The catalyst was found to generate reactive oxygen species (ROS) both in presence and absence of light which is responsible for the decomposition of dyes into small fractions, identified with ESI-mass spectra.

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“…For Acid Red 14 a 20 fold enhancement has been reported [52]. However results such as those shown in Figure 12, for the UV-C decolouration by anatase PC500 of the azo-dye Reactive Orange 16, suggest that the true picture is less simple [53]. Experiments with both 2 mM and 20 mM H 2 O 2 showed that although decolouration by UV-C+TiO 2 +H 2 O 2 is faster than decolouration by UV-C+TiO 2 , it is slower than decolouration by UV-C+H 2 O 2 in the absence of anatase.…”

Section: The Need To Consider Uv Absorption When Interpreting Photmentioning

confidence: 99%

UV-Absorption—The Primary Process in Photocatalysis and Some Practical Consequences

Egerton

2014

Molecules

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TiO2 photochemistry studies generally address reactions of photogenerated charge-carriers at the oxide surface or the recombination reactions which control the proportion of charge carriers that reach the surface. By contrast, this review focuses on UV absorption, the first photochemical step in semiconductor photocatalysis. The influence of particle size on absorption and scattering of light by small TiO2 particles is summarized and the importance of considering, the particle size in the application, not the BET or X-ray line broadening size, is emphasized. Three different consequences of UV absorption are then considered. First, two commercially important systems, pigmented polymer films and paints, are used to show that TiO2 can protect from direct photochemical degradation. Then the effect of UV absorption on the measured photocatalytic degradation of aqueous solutions of organics is considered for two separate cases. Firstly, the consequences of UV absorption by TiO2 on the generation of hydroxyl radicals from H2O2 are considered in the context of the claimed synergy between H2O2 and TiO2. Secondly, the effect of altered UV absorption, caused by changed effective particle size of the catalyst, is demonstrated for photocatalysis of propan-2-ol oxidation and salicylic acid degradation.

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Does hydrogen peroxide really accelerate TiO2 UV-C photocatalyzed decolouration of azo-dyes such as Reactive Orange 16?

Cited by 23 publications

References 34 publications

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Oxide-Clay Mineral as Photoactive Material for Dye Discoloration

Synthesis of Tunable Band Gap Semiconductor Nickel Sulphide Nanoparticles: Rapid and Round the Clock Degradation of Organic Dyes

UV-Absorption—The Primary Process in Photocatalysis and Some Practical Consequences

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