ZnO assisted photocatalytic degradation of acridine orange in aqueous solution using visible irradiation

Pare, Brijesh; Jonnalagadda, Sreekantha B.; Tomar, Hitendra S.; Singh, Pardeep; Bhagwat, V. W.

doi:10.1016/j.desal.2008.01.007

Cited by 214 publications

(87 citation statements)

References 25 publications

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“…Though it is highly effective under the influence of UV light [9,176], with suitable physio-chemical modifications or by doping, ZnO can be used as a visible light photocatalyst. Apart from this, the usage of higher-intensity (500 W) visible light is found to increase the photocatalytic activity of the ZnO nanoparticles [177]. ZnO photocatalyst is also found to be better than SnO 2 , CdS and ZnS for dye degradation under UV and visible light [178].…”

Section: Zinc Oxide As a Photocatalystmentioning

confidence: 94%

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

Elumalai

Chellappan

Jose

et al. 2015

Mater Renew Sustain Energy

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The present review rationalizes the significance of the metal oxide semiconductor (MOS) interfaces in the field of photovoltaics and photocatalysis. This perspective considers the role of interface science in energy harvesting using organic photovoltaics (OPVs) and dye-sensitized solar cells (DSSCs). These interfaces include large surface area junctions between photoelectrodes and dyes, the interlayer grain boundaries within the photoanodes, and the interfaces between photoactive layers and the top and bottom contacts. Controlling the collection and minimizing the trapping of charge carriers at these boundaries is crucial to overall power conversion efficiency of solar cells. Similarly, MOS photocatalysts exhibit strong variations in their photocatalytic activities as a function of band structure and surface states. Here, the MOS interface plays a vital role in the generation of OH radicals, which forms the basis of the photocatalytic processes. The physical chemistry and materials science of these MOS interfaces and their influence on device performance are also discussed.

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Section: Zinc Oxide As a Photocatalystmentioning

confidence: 94%

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

Elumalai

Chellappan

Jose

et al. 2015

Mater Renew Sustain Energy

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“…k 1 is the rate constant of pseudo first order adsorption (1/min). The values of ln(q e -q t ) were plotted against t. The plot of ln(q e -q t ) against t resulted in a linear relationship from which the values of k 1 and q e were determined as shown in Figure 5. The values of the constants are given in Table 1.…”

Section: Pseudo First Order Modelmentioning

confidence: 99%

“…The important advantage of this method is that it often results in complete mineralization and degradation of most pollutants that are not amenable to other treatment processes [14]. Furthermore, it is cheaper than most processes and it can be carried out under ambient conditions [1]. Several studies have been carried out on photocatalytic degradation of dyes, mainly with TiO 2 /UV or ZnO/UV systems and these studies established the factors that influence the rate of the photocatalytic reaction [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Photocatalytic Decolorization of Tartrazine Using Periwinkle Shell Ash: Effect of Operational Variables, Kinetic and Isotherm Study

Amenaghawon¹,

Osarumwense²,

Aisien³

et al. 2015

Int. J. Automot. Mech. Eng.

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The potential of a locally sourced material, periwinkle shell ash (PSA), has been explored as an effective photocatalyst for the photocatalytic decolorization of tartrazine in aqueous solution. The effect of operational variables such as irradiation time, initial dye concentration and catalyst loading on the extent of decolorization was investigated. The results show that the optimum levels of the variables were 50 minutes, 30 mg/L and 5 g/L for irradiation time, initial dye concentration and catalyst loading respectively. The pseudo first order and the Langmuir-Hinshelwood kinetic models were able to sufficiently describe the kinetics of the process. The diffusion mechanism was described by the intra-particle diffusion model, while the adsorption equilibrium was described by the Langmuir isotherm equation. The results obtained indicate that PSA can be used as an effective photocatalyst for the removal of tartrazine from aqueous solution.

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“…Also Zinc oxide, a II-VI semiconductor material with a large direct band gap (3.37 eV) and a relatively high exciton binding energy (60 meV) at room temperature, has attracted considerable attention with respect to the degradation of various pollutants such as acid red 18 (Sobana and Swaminathan 2007), 4-nitrophenol (Parida et al, 2006), acridine orange (Pare et al, 2008), azo dye (Zhang et al, 2008) and so on, due to its being relatively cheap, chemical stability and high photocatalysis (Hong et al, 2006). However, the high degree of recombination of photogenerated electrons and holes in semiconductors decreased greatly their photocatalytic efficiency and impeded the practical application of photocatalytic technique in the degradation of contaminants in water and air.…”

Section: Introductionmentioning

confidence: 99%

Influence of inorganic oxidants and metal ions on photocatalytic activity of prepared zinc oxide nanocrystals

Dorraji¹,

Daneshvar²,

Aber³

2013

Global NEST Journal

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Zinc oxide nanocrystals were prepared by precipitation method using ZnSO 4 .7H 2 O and NaOH as raw materials. The prepared ZnO nanocrystals were characterized by powder X-ray diffraction (XRD). Primary objective was to focus on the influence of inorganic oxidants, metal ions and anions on photocatalytic activity of prepared ZnO nanocrystals. The study on the effects of oxidants such as . But negative effects are observed in the presence of anions. The possible roles of the additives on the reaction and the possible mechanisms of effect were discussed. The quantum yield ( ϕ ) and electrical energy per order (E EO ) were estimated and compared for UV/ZnO/Oxidant catalytic system. KEYWORD: ZnO, Photocatalysis, electrical enrgy, quantum yield, metal ions, oxidants.

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ZnO assisted photocatalytic degradation of acridine orange in aqueous solution using visible irradiation

Cited by 214 publications

References 25 publications

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

Photocatalytic Decolorization of Tartrazine Using Periwinkle Shell Ash: Effect of Operational Variables, Kinetic and Isotherm Study

Influence of inorganic oxidants and metal ions on photocatalytic activity of prepared zinc oxide nanocrystals

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