Photocatalytic degradation of methyl orange using ZnO nanorods

Ghule, L. A.; Patil, A.A.; Sapnar, K. B.; Dhole, S.D.; Garadkar, K. M.

doi:10.1080/02772248.2011.560852

Cited by 47 publications

(14 citation statements)

References 47 publications

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“…The pH value affects the adsorption−desorption of the organic molecules on the surface of the photocatalyst [47,[65][66][67], the generation of hydroxyl radicals and active oxygen species [52,65,67], and the composite stability [68].…”

Section: Ph Valuementioning

confidence: 99%

“…Ghule et al [65] evaluated the effect of the pH (3, 5, 7, 10, and 12) on the degradation of MO by a ZnO/PVA powder prepared by mixing the polymer with the catalyst. Yan et al [47] used TiO 2 /PVA films, synthesized by the hydrothermal method, to remove Cr(VI) from solutions with different pHs (1.8, 2.2, 3, 3.9, 4.2, 5.9, and 6.4).…”

Section: Ph Valuementioning

confidence: 99%

“…Therefore, to remove basic dyes from the water, a pH higher than the pHzpc of the catalyst must be selected, and to remove the azo dyes, a pH lower than the pHzpc must be chosen. According to the literature, the pHzpc of TiO 2 is 6.3 and that of ZnO is 9 [65,67]. However, Azeez et al [69] reported that pHzpc may depend on the conditions used during preparation of the nanoparticles.…”

Section: Ph Valuementioning

confidence: 99%

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An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

Silva

Gomes

Ferreira

et al. 2022

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In recent years, alarm has been raised due to the presence of chemical contaminants of emerging concern (CECs) in water. This concern is due to the risks associated with their exposure, even in small amounts. These complex compounds cannot be removed or degraded by existing technologies in wastewater treatment plants. Therefore, advanced oxidation processes have been studied, with the objective of developing a technology capable of complementing the conventional water treatment plants. Heterogenous photocatalysis stands out for being a cost-effective and environmentally friendly process. However, its most common form (with suspended catalytic particles) requires time-consuming and costly downstream processes. Therefore, the heterogeneous photocatalysis process with a supported catalyst is preferable. Among the available supports, polymeric ones stand out due to their favorable characteristics, such as their transparency, flexibility and stability. This is a relatively novel process; therefore, there are still some gaps in the scientific knowledge. Thus, this review article aims to gather the existing information about this process and verify which questions are still to be answered.

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Section: Ph Valuementioning

confidence: 99%

Section: Ph Valuementioning

confidence: 99%

Section: Ph Valuementioning

confidence: 99%

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An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

Silva

Gomes

Ferreira

et al. 2022

Water

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“…As it is clear from the Fig. 5, improvement on removal efficiency is not obvious above 0.4 g L −1 , because higher catalyst loading cause higher agglomeration (particle/particle interaction) and turbidity of suspension, consequently reduces the available surface area for absorbing the PhP molecules and scattering effect increases which causes a decrease in UV light penetration to the solution [26][27][28][29]. The same observation was reported for the photocatalytic degradation of methyl orange using ZnO-SnO 2 nanoparticles by Behnajady and Tohidi [30].…”

Section: Effect Of Operational Variables As Response Surface and Contmentioning

confidence: 92%

Application of response surface methodology for optimization of operational variables in photodegradation of phenazopyridine drug using TiO2/CeO2 hybrid nanoparticles

Eskandarloo

Badiei

Behnajady

2015

Desalination and Water Treatment

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In the present work, a powder mixture of the TiO 2 and CeO 2 solid oxides was used for preparation of TiO 2 /CeO 2 hybrid nanoparticles. Crystallite size and structure of prepared TiO 2 /CeO 2 hybrid nanoparticles were determined by X-ray diffraction and transmission electron microscopy techniques. The effect of operational variables such as catalyst dosage, initial drug concentration, irradiation time, and distance of the solution from UV lamp was predicted and optimized in the photocatalytic removal of phenazopyridine (PhP) using response surface methodology. The results showed that the predicted values of removal efficiency were found to be in good agreement with the experimental results with a correlation coefficient (R 2 ) of 0.9542. The optimum operational conditions were found to be: catalyst dosage of 0.41 g L −1 , initial drug concentration of 6.61 mg L −1 , irradiation time of 30 min, and distance of the solution from UV lamp of 2 cm. Under the optimized conditions, the maximum removal rate (97.74%) of PhP was achieved.

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“…It can provide high mobility [3], high transparency [4], nontoxicity and biocompatibility [5]. According to great function of zinc oxide, several techniques have been proposed for zinc oxide synthesis such as thermal decomposition method [5,6], hydrothermal synthesis [4,7], sol-gel synthesis [8], flame 2 spray pyrolysis [9] and precipitation method [10]. Since environmental problems such as water pollution, semiconductor based photocatalytic reactions have attracted interest as an effective candidate for purifying contaminants [11].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO nanorods modified with TPP, TPPS and Cu-TPPS for photodegradation of MB

Rahimi

Shokrayian

Rabbani

2013

Proceedings of the 17th International Electronic Conference on Synthetic Organic Chemistry

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In this study, ZnO nanorods have been synthesized by a simple precipitation technique with zinc nitrate as starting material in the presence of ammonium hydroxide followed by calcination at 450 ˚C. Then meso-tetrakis(4-phenyl) porphyrin (TPP), meso-tetrakis(4-sulfonatophenyl) porphyrin (TPPS), and Copper meso-tetrakis(4-sulfonatophenyl) porphyrin (Cu-TPPS) have been immobilized on the ZnO nanorods and the potential of the obtained photocatalysts in degradation of methylene blue dye was studied under UV and visible irradiation. The photocatalysts were characterized by various techniques such as XRD, SEM and FT-IR. The influence of experimental parameters on the dye photodecolorization process was studied. The role of porphyrins as sentisizers was also investigated on decolorization rate. Under these optimum conditions, the obtained decolorization efficiency for MB dye was more than 90% under visible light. The reusability of the intended catalyst was also investigated.ZnO nanorod

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Photocatalytic degradation of methyl orange using ZnO nanorods

Cited by 47 publications

References 47 publications

An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

An Overview of Polymer-Supported Catalysts for Wastewater Treatment through Light-Driven Processes

Application of response surface methodology for optimization of operational variables in photodegradation of phenazopyridine drug using TiO2/CeO2 hybrid nanoparticles

Synthesis of ZnO nanorods modified with TPP, TPPS and Cu-TPPS for photodegradation of MB

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