Photobleaching of methyl orange in titanium dioxide suspended in aqueous solution

Chen, Lung-Chyuan; Chou, Tse‐Chuan

doi:10.1016/0304-5102(93)80102-z

Cited by 55 publications

(3 citation statements)

References 29 publications

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“…This may result in an enhanced rate of deactivation of activated molecules by collision with ground state titanium dioxide particles and hence decreases in dye concentration. 141,163 Effect of the initial dye concentration It has been reported earlier that by increasing the dye concentration, the decolourization rate constant (k) decreases. 138 The initial dye concentration can affect the rate of photodegradation based upon two main aspects.…”

Section: Effect Of Photocatalyst Loadmentioning

confidence: 99%

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

et al. 2014

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Section: Effect Of Photocatalyst Loadmentioning

confidence: 99%

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

et al. 2014

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“…It was observed that in the absence of catalyst no decolorisation occurred. Further, percentage decolorisation increased with an increase of catalyst weight up to 2.5 g/L, above which efficiency decreased moderately (Chen & Chou 1993). The increase is attributed to the availability of more surface area at higher amount of catalyst, which increases the absorption of photons.…”

Section: Effect Of Weight Of Catalystmentioning

confidence: 89%

Studies on photocatalytic activity of the synthesised TiO2 and Ag/TiO2 photocatalysts under UV and sunlight irradiations

Vaithiyanathan

Thiripuranthagan

2011

Water Science and Technology

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Photocatalytic decolorisation and degradation of Reactive Red 120 (RR 120) has been investigated under UV (365 nm) and solar light as radiation sources using synthesised nano titania catalyst prepared via sol-gel method. The study encompassed calcination of synthesised titania catalyst at a range of temperature up to 1,000°C. The effects of calcination temperature on titania catalyst have been evaluated on the decolorisation of RR 120. The analysis revealed complete decolorisation of dye solution in 100 min under UV light with the TiO2 catalyst calcined at 200°C. Only a maximum of 47% dye decolorisation was achieved under sunlight in 4 h with no improvement even after prolonged irradiation. In an endeavour to improve the catalytic activity, bare titania was modified with silver metal and a comprehensive study on the characteristics of silver modified catalyst was made. The result was an enhancement of the rate of decolorisation of dye under both UV and solar light sources. All the catalysts were characterised by XRD and BET analyses. Optimisation of the degradation of RR 120 has been carried out using the unmodified catalyst by varying the amount of catalyst, substrate concentration, pH of dye solution. Effects of addition of small amounts of various oxidants such as H2O2, KBrO3 and (NH4)2S2O8 have also been studied. Pseudo first order kinetics was observed in the photocatalytic decolorisation of dye. The mineralisation of RR 120 was monitored by TOC analysis.

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“…As an acid-based indicator, methyl orange is very sensitive to the environment in solution. And its color and structure strongly depends on pH [23]. To clarify the effects of the initial pH on the photocatalytic degradation of MeO, seven samples were prepared, with MCC/CdS nanocomposite (0.5 g) added to a methyl orange solution (20 mg/L, 100 mL).…”

Section: Effect Of the Initial Ph On The Degradation Of Meomentioning

confidence: 99%

Fabrication of Microcrystalline Cellulose/CdS Nanocomposites and their Photocatalytic Properties

Tang

Xia

2013

AMR

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Microcrystalline cellulose (MCC)/cadmium sulfide (CdS) nanocomposites were prepared by using ultrasound wave irradiation. The as-prepared samples were characterized using scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS), atomic absorption spectrometry (AAS), transmission electron microscopy (TEM). The photocatalytic behavior of MCC/CdS nanocomposites was evaluated using the degradation of a methyl orange (MeO) aqueous solution under ultraviolet (UV) light irradiation. Results showed that CdS nanoparticles were evenly distributed on the surface of MCC with little aggregation; the amount of Cd attached to the MCC was 23.75 % (w/w, Cd/composites). The MeO degradation rate was much higher when the MCC/CdS nanocomposites were irradiated with UV light than when CdS powder alone was irradiated. In dark conditions, the MCC/CdS nanocomposites showed almost no photocatalytic activity. In addition, the amount of MCC/CdS nanocomposites added to MeO solution and the initial pH of the MeO solution were also important factors influencing the photocatalytic activity. The results show that MCC/CdS nanocomposites are promising materials with excellent performance in photocatalytic applications.

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Photobleaching of methyl orange in titanium dioxide suspended in aqueous solution

Cited by 55 publications

References 29 publications

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

Studies on photocatalytic activity of the synthesised TiO2 and Ag/TiO2 photocatalysts under UV and sunlight irradiations

Fabrication of Microcrystalline Cellulose/CdS Nanocomposites and their Photocatalytic Properties

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Photobleaching of methyl orange in titanium dioxide suspended in aqueous solution

Cited by 55 publications

References 29 publications

Principles and mechanisms of photocatalytic dye degradation on TiO2based photocatalysts: a comparative overview

Principles and mechanisms of photocatalytic dye degradation on TiO2based photocatalysts: a comparative overview

Studies on photocatalytic activity of the synthesised TiO2 and Ag/TiO2 photocatalysts under UV and sunlight irradiations

Fabrication of Microcrystalline Cellulose/CdS Nanocomposites and their Photocatalytic Properties

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Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview

Principles and mechanisms of photocatalytic dye degradation on TiO₂based photocatalysts: a comparative overview