Effect of transition metal ions on photocatalytic activity of ZnO in bleaching of some dyes

Bhandari, S. S.; Vardia, Jitendra; Malkani, R. K.; Ameta, Suresh C.

doi:10.1080/02772240500535210

Cited by 22 publications

(9 citation statements)

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“…(1) The surface of TiO 2 /NiO coupled nanoparticles in a fixed-bed system becomes slightly positively charged, when the transition-metal ions get adsorbed to the surface. , Therefore, the adsorption of AF molecules effectively occur on the TiO 2 /NiO surface because AF molecules are anionic and the catalyst surface as the result of cation adsorption is positively charged. For this purpose, the adsorption of AF onto TiO 2 /NiO nanoparticles in the absence and presence of each metal ion was studied (Figure b), and the results confirmed that in the presence of metal ions, the adsorption rate of AF onto catalyst increases.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The negative effect of high metal ions concentration can be explained by this fact, which limited the concentration of metal ions; the high concentration of metal ions has a filter effect due to UV light absorption and reduces the light intensity in the reaction medium, thus lowering the photocatalytic degradation rate . Also, some authors reported ,,, when the concentration of dissolved transition-metal ions is higher, the M + ions produced by the electrons and exists as the predominant ions in the reaction medium, that the M + ions are oxidized to M 2+ by the photoinduced h + on the surface of TiO 2 /NiO catalysts (eq ). normalM + + normalh + → normalM 2 + …”

Section: Results and Discussionmentioning

confidence: 99%

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Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Eskandarloo

Badiei

Behnajady

2014

Ind. Eng. Chem. Res.

102

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In the present work, TiO 2 /NiO coupled nanoparticles were prepared from a powder mixture of the corresponding component solid oxides by using an impregnation technique. Then, the prepared TiO 2 /NiO nanoparticles were immobilized on glass plate and used as a fixed-bed photocatalytic system for photodegradation of Acid Fuchsin (AF), as a triphenylmethane dye pollutant. The effects of nature and concentration of various additives included inorganic oxidants (such as HSO 5and BrO 3 − ), inorganic anions (such as CH 3 COO − , CO 3 2− , NO 3 − , Cl − , H 2 PO 4 − , and SO 4 2−), and transition-metal ions (such as Co 2+ , Zn 2+ , Fe 2+ , Cu 2+ , Ni 2+ , and Mn 2+ ) on photocatalytic degradation of AF, were investigated. It was found that the nature and concentration of studied additives significantly affected the photocatalytic degradation of dye pollutant in fixedbed systems. The transition-metal ions and inorganic oxidants have a positive effect on the photocatalytic degradation rate of AF dye, whereas inorganic anions have a negative effect. An artificial neural network (ANN) model was designed for modeling of the photocatalytic degradation rate of AF dye. The results showed that the predicted data from designed ANN model were in good agreement with the experimental data. Designed ANN provides a reliable method for modeling the photocatalytic activity of immobilized TiO 2 /NiO nanoparticles in the presence of various additives.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Eskandarloo

Badiei

Behnajady

2014

Ind. Eng. Chem. Res.

102

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“…As this effect reduces the electrostatic repulsion for anionic dyes, they can be adsorbed and degraded readily in the presence of metal ions. On the contrary, a retarding effect can also be observed for cationic dyes due to the decrease in attraction between positively charged dye molecules and neutral/ slightly positive catalyst surface [87].…”

Section: Effect Of Dye Loadingmentioning

confidence: 99%

Photocatalysts for degradation of dyes in industrial effluents: Opportunities and challenges

et al. 2019

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Discharging dye contaminants into water is a major concern around the world. Among a variety of methods to treat dye-contaminated water, photocatalytic degradation has gained attention as a tool for treating the colored water. Herein, we review the recent advancements in photocatalysis for dye degradation in industrial effluents by categorizing photocatalyst materials into three generations. First generation photocatalysts are composed of single-component materials (e.g., TiO 2 , ZnO, and CdS), while second generation photocatalysts are composed of multiple components in a suspension (e.g., WO 3 /NiWO 4 , BiOI/ZnTiO 3 , and C 3 N 4 /Ag 3 VO 4 ). Photocatalysts immobilized on solid substrates are regarded as third generation materials (e.g., FTO/WO 3 -ZnO, Steel/TiO 2 -WO 3 , and Glass/P-TiO 2 ). Photocatalytic degradation mechanisms, factors affecting the dye degradation, and the lesser-debated uncertainties related to the photocatalysis are also discussed to offer better insights into environmental applications. Furthermore, quantum yields of different photocatalysts are calculated, and a performance evaluation method is proposed to compare photocatalyst systems for dye degradation. Finally, we discuss the present limitations of photocatalytic dye degradation for field applications and the future of the technology.

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“…Mittal et al [13] tried batch and bulk removal of fast green FCF from wastewater by adsorption over de-oiled soya and bottom ash, which are agricultural waste and power plants waste, respectively. Various researchers investigated the degradation of fast green dye using Azadirachta indica (neem) leaf powder [14], electrogenerated Fenton reagent at carbon-felt cathode [15], aqueous suspension of titanium dioxide under a variety of conditions [16,17] and ZnO [18] as photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic degradation of fast green using nanosized CeCrO<sub>3</sub>

Bhati

Punjabi

Ameta

2010

Maced. J. Chem. Chem. Eng.

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Fast green dye has been widely used in histology and cytology. It has been found to have tumorigenic effects in experimental animals, as well as mutagenic effects in both experimental animals and humans. Furthermore, in its undiluted form it poses risks of irritation of eyes, skin, digestive tract, and respiratory tract. For photocatalytic degradation of fast green dye the nano-sized bimetal ternary oxide (CeCrO3) ultrafine powder has been prepared using microwave treatment. It has been characterized by XRD and SEM. The photocatalytic degradation of fast green dye was measured by visible absorption spectroscopy. To obtain the optimal conditions for the dye degradation, the effect of various experimental parameters, i.e. pH, amount of photocatalyst, concentration of dye and light intensity on the rate of reaction was studied. A tentative mechanism for the photocatalytic degradation of fast green was proposed. Photocatalytic degradation of fast green dye followed a pseudo first-order kinetics. It was found that the dye degradation gave the best results at a pH of 7.5, and using a 70 mW·cm–2 light intensity with 0.05 g of nano-sized CeCrO3. At room temperature, the photocatalytic degradation rate constant of fast green dye was k = 4.41·10–4 s–1.

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Effect of transition metal ions on photocatalytic activity of ZnO in bleaching of some dyes

Cited by 22 publications

References 1 publication

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Photocatalysts for degradation of dyes in industrial effluents: Opportunities and challenges

Photocatalytic degradation of fast green using nanosized CeCrO<sub>3</sub>

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Effect of transition metal ions on photocatalytic activity of ZnO in bleaching of some dyes

Cited by 22 publications

References 1 publication

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO2/NiO Nanoparticles: Artificial Neural Network Modeling

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO2/NiO Nanoparticles: Artificial Neural Network Modeling

Photocatalysts for degradation of dyes in industrial effluents: Opportunities and challenges

Photocatalytic degradation of fast green using nanosized CeCrO<sub>3</sub>

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Product

Resources

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Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling

Study of the Effect of Additives on the Photocatalytic Degradation of a Triphenylmethane Dye in the Presence of Immobilized TiO₂/NiO Nanoparticles: Artificial Neural Network Modeling