Effective photocatalytic degradation of rhodamine B dye by ZnO nanoparticles

Rahman, Qazi Inamur; Ahmad, Musheer; Misra, Sunil; Lohani, Minaxi

doi:10.1016/j.matlet.2012.09.044

Cited by 353 publications

(128 citation statements)

References 21 publications

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“…These semiconductors are appropriate in photocatalytic reactions 15,44 , promoting the kinetic represented in Figure 7. According to Figure 6A, ZnO SG and ZnO PP promoted degradation of 88% of RhB within 180 minutes.…”

Section: Photocatalysismentioning

confidence: 99%

“…, k is the velocity constant of the reaction, [SA] is the concentration of active sites on the catalyst surface, t is the irradiation time, and RhB is equal to C, which represents the concentration of RhB dye 15 . The formation of radicals responsible for dye degradation is correlated to high velocity constant of the reaction (k') and low half-life time.…”

Section: Photocatalysismentioning

confidence: 99%

“…The more efficient semiconductors that promote photocatalysis are TiO 2 and ZnO [11][12][13][14] . These semiconductors present band gap suitable for such process, which allows for degrading of 100% of dyes in a short time 15,16 . However, several factors can interfere with the catalytic activity of these materials 17,18 , e.g., the method of synthesis 19 , the presence of surface contaminants [20][21][22] , particle shapes 23 , etc.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

et al. 2017

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This paper describes the development of TiO 2 and ZnO particles by a chemical route, using two different wet synthesis methods: polymeric precursor (PP) and sol-gel (SG). This study aimed to shed a light on how the synthesis method affects the photocatalytic activity of these oxides. Rhodamine B (RhB) degradation was used as a probe reaction to test the as-synthesized TiO 2 and ZnO photoactivity. It was observed that surface availability, which is related to the presence of synthesis residue, is the key parameter to determine photoactivity. ZnO PP and ZnO SG presented degradation of 88% to RhB. Both samples presented synthesis residue on the surface. On the other hand, TiO 2 PP presented a better performance than TiO 2 SG, once 90% of RhB was degraded, while TiO 2 SG degraded 80% of the dye. In this case, TiO 2 PP was free of synthesis residue on the surface, while TiO 2 SG presented residues.

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Section: Photocatalysismentioning

confidence: 99%

Section: Photocatalysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

et al. 2017

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“…The as-synthesized ZnO nano-whiskers (ZNWs) were applied as photo-catalyst to investigate the photocatalytic degradation of Acid Red 183. oxidation and reduction reaction takes place at the surface of the semiconductor and if there the photogenerated electron-hole pair did not separate well there is possibility recombination of electron-hole pairs and this will diminish the efficiency of photocatalytic reaction [28][29][30]. According to this, the relevant reactions at the semiconductor surface causing the degradation of dyes can be expressed as follows [11] The recombination of electron-hole pairs is acting as one of major factor that is responsible for inefficiencies of the photocatalytic processes. Every effort to prevent electron and electron-hole recombination will improve the efficiency of heterogeneous photocatalytic processes and will considerably help to achieve the application of efficient degradation.…”

Section: Research Articlementioning

confidence: 99%

“…The photocatalysis has been successfully employed for various potential hazardous pollutants and industrial effluents into less harmful materials. Different studies have proved this with different pollutants like dyes, drugs, surfactants, pesticides, herbicides, insecticides and fungicides that can be completely mineralized in the presence of zinc oxide nanostructures [10][11][12]. [17].…”

Section: Introductionmentioning

confidence: 96%

Efficient Photo-catalytic Degradation of Acid Red 183 dye in the presence of ZnO nano-whiskers

Khan¹

2015

Appl. Sci. Lett.

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This paper reports on ZnO nano-whiskers (ZNWs), synthesized by sol-gel method at a pre-determined speed by using zinc acetate dehydrate and a cationic surfactant, N-cetyl-N,N,N-trimethyl ammonium bromide (CTAB) . The effect of pre-determined stirring condition on the particle size, aspect-ratio and morphology of ZNWs has been studied. The SEM and TEM result shows that zinc oxide developed into the huge colony consisting of adequate ZnO nano-whiskers, which contained a large number of long needle-like whiskers and the density of these colonies showed a good amount in each bunch. The average length and diameter of the long needle-like ZnO nano-whiskers are 36 nm and 1.15 nm, respectively, and their average aspect ratio was L/D = 31.3.The photo-catalytic activity of the ZNWs was executed by studying the degradation of Acid Red 183 as a function of irradiation time resulting into 68% of decolouration after 150 min of irradiation in the presence of ZNWs under UV light illumination.

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Metal Oxide Semiconductors and their Nanocomposites Application Towards Photovoltaic and Photocatalytic

Ameen

Seo

2014

Advanced Energy Materials

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The fabrication of semiconducting materials with controlled size and morphology is an exciting, rapidly expanding research area for realizing the peculiar physical/chemical properties and the possible practical applications at the nano-to-microscale. Also, the technological applications for nanocomposites of organic/inorganic materials are of great interest in scientifi c research due to their unique and tunable electronic and optical properties. The semiconducting materials at nanoscale are widely used for the manufacturing of various electronic, electrical and photovoltaic devices owing to their unique band structure, optical properties, good charge mobility and ability to absorb photons from light. Among various photovoltaic devices, a regenerative photoelctrochemical solar cell called DSSC is a promising photovoltaic device for achieving reasonably high conversion effi ciency as compared to the conventional silicon solar cells. Various metal oxide semiconducting nanomaterials such as ZnO, TiO 2 , SnO 2 , Nb 2 O 5 and CeO 2 -based thin fi lm electrodes and their nanocomposites have also shown comparably good conversion effi ciency of DSSC due to their good optical and electronic properties. These semiconducting metal oxides possess high surface area which is essential for acquiring a high amount of dye

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Effective photocatalytic degradation of rhodamine B dye by ZnO nanoparticles

Cited by 353 publications

References 21 publications

Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

Evaluation of the Photocatalytic Potential of TiO2 and ZnO Obtained by Different Wet Chemical Methods

Efficient Photo-catalytic Degradation of Acid Red 183 dye in the presence of ZnO nano-whiskers

Metal Oxide Semiconductors and their Nanocomposites Application Towards Photovoltaic and Photocatalytic

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