Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

Zuorro, Antonio; Lavecchia, Roberto; Monaco, Marika Michela; Iervolino, Giuseppina; Vaiano, Vincenzo

doi:10.20944/preprints201906.0233.v1

Cited by 22 publications

(5 citation statements)

References 28 publications

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“…As an explanation, when CV concentration was low, the number of active sites are unfilled, thus the activity of photodecolorization was high. But at high concentration of dye the rate of photodecolorization was low, because of full covering of the surface and the dye made a screen effect and depleted of UV light and preventing of electron-hole pair separation, and thus the efficiency is low when CV concentration is high according to inner filter effect as reported [34][35][36]. For the photocatalytic process, which is demonstrated by the substrate's adsorption characteristics on the photocatalyst surface, the Langmuir-Hinshelwood rate equation is hugely beneficial.…”

Section: Resultsmentioning

confidence: 99%

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Photocatalytic Decolorization of Crystal Violate Dye Solution by ZnO/MWCNT Nanocomposite

Oda,

Khudheyer,

Obaid

2023

Iraqi Journal of Science

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By extracting crystal violate dye (CV) from its aqueous solution, the photocatalytic decolorization performance of ZnO/MWCNT nanocomposite was evaluated. The nanocomposite was prepared by precipitation of ZnO and incorporates on the surface of Multi-Walled Carbon Nanotubes (MWCNT). ZnO nanoparticles were synthesized using the sol gel process with MWCNT acting as a template. They were then analyzed by XRD, SEM, and TEM, which revealed how the shape of the spherical nano ZnO interacts with the point of zero charge (pzc), which allows us to see the physical attributes. In the dipping photoreactor, which included a slurry of dye solution and ZnO/MWCNT nanocomposite, the effectiveness of decolorization was assessed. The photodecolorization was studied for CV dye in aqueous solution at different conditions: The effect of time, weight of catalyst, concentration of dye, temperature, the initial pH of dye solution and addition of S2O82- to show the optimum condition of this process. The main results were the synthesis of incorporated ZnO on MWCNT surface with 10-20 nm with high photodecolorization against CV dye. Full decolorization reached at 90 min and 89.8% decolorization at the half time of reaction. ZnO/MWCNT weight of 0.06 gm per 100 mL was optimum for photodecolorization. The photocatalytic reaction was more efficient in the deceasing of CV concentration and obeys the Langmuir-Hinshelwood kinetic, while the photodecolorization was not less than 95% in pH range 6-10.Also, the photocatalytic reaction was effected in the presence of S2O82-, where the photodecolorization was more efficient.

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Section: Resultsmentioning

confidence: 99%

“…This formula has been widely used for prediction the photocatalytic degradation of various organic compounds in photocatalysts like ZnO/MWCNT suspensions under UV light illumination. The Langmuir-Hinshelwood equation can be expressed using following equation [34][35][36][37]:…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Decolorization of Crystal Violate Dye Solution by ZnO/MWCNT Nanocomposite

Oda,

Khudheyer,

Obaid

2023

Iraqi Journal of Science

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“…As the TEOA concentration increased, the pH value of the MB solution increased, as shown in Figure 2 b. It was reported that the photocatalytic reaction increased with increasing pH values because OH − ions can form OH· radicals that eventually promote photocatalytic reactions [ 20 , 21 ]. Thus, to distinguish between the scavenger and pH effects on the photocatalytic reactions when adding TEOA in the MB solution, the pH effect on the MB degradation was investigated at different pH conditions (8.0–10.5) by adding NH 4 OH.…”

Section: Resultsmentioning

confidence: 99%

Fast-Response Colorimetric UVC Sensor Made of a Ga2O3 Photocatalyst with a Hole Scavenger

Ryou

Kim

Shin

et al. 2021

Sensors

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A fast-response colorimetric ultraviolet-C (UVC) sensor was demonstrated using a gallium oxide (Ga2O3) photocatalyst with small amounts of triethanolamine (TEOA) in methylene blue (MB) solutions and a conventional RGB photodetector. The color of the MB solution changed upon UVC exposure, which was observed using an in situ RGB photodetector. Thereby, the UVC exposure was numerically quantified as an MB reduction rate with the R value of the photodetector, which was linearly correlated with the measured spectral absorbance using a UV-Vis spectrophotometer. Small amount of TEOA in the MB solution served as a hole scavenger, which resulted in fast MB color changes due to the enhanced charge separation. However, excessive TEOA over 5 wt.% started to block the catalytical active site on the surface of Ga2O3, prohibiting the chemical reaction between the MB molecules and catalytic sites. The proposed colorimetric UVC sensor could monitor the detrimental UVC radiation with high responsivity at a low cost.

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“…Therefore, the development of an effective technique for removing the dye from the dyeing wastewater is strongly desired. Roberto et al reported that Azo Dye Reactive Violet 5 (RV5) could be effectively removed using photocatalysis technology [ 32 ], and Zuorro et al also showed the usefulness of RV5 dye removal technology using non-living cells of Nannochloropsis oceanica [ 33 ]. Further elucidation of the mechanism of azo dye adsorption and the development of its dye removal technology is desired.…”

Section: Discussionmentioning

confidence: 99%

Dye Adsorption Mechanism of Glass Fiber-Reinforced Plastic/Clay Ceramics and Influencing Factors

et al. 2021

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The effective reuse of waste glass fiber-reinforced plastic (GFRP) is desired. We previously produced porous ceramics by firing mixtures of crushed GFRP and clay in a reducing atmosphere and demonstrated their applicability as adsorbents for the removal of basic dyes from dyeing wastewater. However, the primary influencing factors and the dye adsorption mechanism have not been fully elucidated, and the adsorption of acidic and direct dyes has not been clarified. In this study, adsorption tests were conducted, and the effects of the firing atmosphere, specific surface area, type of dye, and individual components were comprehensively investigated. The results showed that reductively fired ceramics containing plastic carbide residue adsorbed basic dye very well but did not adsorb acidic dye well. The clay structure was the primary factor for the dye adsorption rather than the GFRP carbide. The mechanism for the basic dye adsorption appears to have been an increase in specific surface area due to the plastic carbide residue in the ceramic structure, which increased the ion exchange between the clay minerals and the dye. By adjusting the pH of the aqueous solution, the GFRP/clay ceramic also adsorbed considerable amounts of direct dye, so the mechanism was determined to be ion exchange with the calcium component of the glass fibers.

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Photocatalytic Degradation of Azo Dye Reactive Violet 5 on Fe-Doped Titania Catalysts under Visible Light Irradiation

Cited by 22 publications

References 28 publications

Photocatalytic Decolorization of Crystal Violate Dye Solution by ZnO/MWCNT Nanocomposite

Photocatalytic Decolorization of Crystal Violate Dye Solution by ZnO/MWCNT Nanocomposite

Fast-Response Colorimetric UVC Sensor Made of a Ga2O3 Photocatalyst with a Hole Scavenger

Dye Adsorption Mechanism of Glass Fiber-Reinforced Plastic/Clay Ceramics and Influencing Factors

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