Photodegradation of rhodamine 6G in aqueous solution via SrCrO4 and TiO2 nano-sphere mixed oxides

Ghorai, Tanmay Kumar; Biswas, Niladri

doi:10.1016/j.jmrt.2013.03.002

Cited by 41 publications

(14 citation statements)

References 30 publications

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“…From Figure 12 and Figure 13 we observe that as the sample is irradiated the pristine absorbance peak decreases, while two new peaks are formed. This behavior is different than previously measured for irreversible photobleaching, where the absorbance peak decreases with no new peaks being formed [48][49][50][51]. One possible explanation for the observed behavior is the photo-induced formation of J-Type dimers [52][53][54] and/or trimers [53].…”

Section: Images and Vis Absorbancecontrasting

confidence: 86%

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

2015

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One of the fundamental difficulties in implementing organic dyes in random lasers is irreversible photodegradation of the dye molecules, leading to loss of performance and the need to replace the dye. We report the observation of self-healing after photodegradation in a Rhodamine 6G dye and nanoparticle doped polyurethane random laser. During irradiation we observe two distinct temporal regions in which the random lasing (RL) emission first increases in intensity and redshifts, followed by further redshifting, spectral broadening, and decay in the emission intensity. After irradiation the emission intensity is found to recover back to its peak value, while still being broadened and redshifted, which leads to the result of an enhancement of the spectrally integrated intensity. We also perform IR-VIS absorbance measurements and find that the results suggest that during irradiation some of the dye molecules form dimers and trimers and that the polymer host is irreversibly damaged by photooxidation and Norrish type I photocleavage.

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Section: Images and Vis Absorbancecontrasting

confidence: 86%

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

2015

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“…TiO 2 has attractive applications in cosmetics and in the production of electrochemistry electrodes, capacitors, solar cells and catalysis (Ghorai and Biswas 2013). Also, TiO 2 is widely used as a photocatalyst for the degradation of organic and inorganic substances because of low cost, high stability against corrosion and non-toxicity.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation of bromophenol blue in aqueous medium using graphene nanoplates-supported TiO2

2019

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The bromophenol blue dye in aqueous medium was photodegraded (under UV irradiation) by graphene nanoplates-supported titanium oxide (TiO 2 /GNP). The determination of various elements (percentage) and morphological study was performed using energy-dispersive X-rays and scanning electron microscopy, while the photodegradation study of dye was done by UV-visible spectrophotometer. The morphological study showed that the TiO 2 particles were dispersed well on the surface of GNP. The sizes of TiO 2 particles were below 500 nm. The photodegradation study was performed as function of time, and it was found that the photodegradation of dye in aqueous medium was increased as the time duration of UV irradiation increased. It was found that about 86% of dye was degraded within 8 h. The degradation of bromophenol blue is pHdependent, and the photodegradation rate was increased as the pH of solution increased. The increase in dye degradation might be due to the formation of more hydroxyl radical at higher pH. The degradation of dye at pH 2, 4, 6 and 8 was about 70, 79, 90 and 95%, respectively.

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“…The degradation yield (determined by chemical oxygen demand) was shown to be 88%. Ghorai and Biswas (2013) used a TiO 2 -SrCrO 4 oxide system to decolor C.I. Basic Red 1 (concentration 10 −3 M) under UV light.…”

Section: Analysis Of Photocatalytic Activitymentioning

confidence: 99%

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

et al. 2019

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A TiO 2 -ZnO binary oxide system (with molar ratio TiO 2 :ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure parameters (low-temperature N 2 sorption) and characteristic functional groups (FT-IR) of the TiO 2 -ZnO oxide materials were comprehensively analyzed. The novelty of this work is the observation of the coexistence of the crystalline structures of anatase and ZnTiO 3 in TiO 2 -ZnO oxide materials. Moreover, it is shown that the obtained materials absorb visible radiation. The key stage of the study was the evaluation of the photocatalytic activity of the TiO 2 -ZnO binary oxide systems in the degradation of model organic pollutants: C.I. Basic Red 1, C.I. Basic Violet 10, C.I. Basic Blue 3 and 4-nitrophenol. For all synthesized materials, a high efficiency of degradation of the model organic impurities was demonstrated. The results show that the synthesized products may be materials of interest for use in the degradation of organic pollutants. Moreover, the kinetics of the photocatalytic degradation of selected organic compounds were determined based on the Langmuir-Hinshelwood equation, assuming a pseudo-first-order (PFO) reaction.

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Photodegradation of rhodamine 6G in aqueous solution via SrCrO4 and TiO2 nano-sphere mixed oxides

Cited by 41 publications

References 30 publications

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

Photodegradation and self-healing in a Rhodamine 6G dye and $$\hbox {Y}_{2}\hbox {O}_{3}$$ nanoparticle-doped polyurethane random laser

Photodegradation of bromophenol blue in aqueous medium using graphene nanoplates-supported TiO2

Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

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