Nanoparticles of zinc sulfide doped with manganese, nickel and copper as nanophotocatalyst in the degradation of organic dyes

Pouretedal, Hamid Reza; Norozi, Abbas; Keshavarz, Mohammad Hossein; Semnani, Abolfazl

doi:10.1016/j.jhazmat.2008.05.128

Cited by 351 publications

(142 citation statements)

References 33 publications

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“…Therefore, the UV light is absorbed by the molecules of furfural, and the stimulation of nanophotocatalyst particles by photons is reduced. These results are in accordance with those of previous studies [9,23].…”

Section: E Ect Of the Furfural Initial Concentrationsupporting

confidence: 94%

Degradation of furfural in contaminated water by titanium and iron oxide nanophotocatalysts based on the natural zeolite (clinoptilolite)

2017

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Abstract. In this study, the performance of advanced oxidation process using titanium and iron oxides based on the natural clinoptilolite zeolite (TiO 2 /Fe 2 O 3 /Clinoptilolite) as a nanophotocatalyst was studied, and the e ects of various factors on the furfural degradation, such as pH, dosage of catalyst, initial concentration of furfural, and contact time, were examined. The co-precipitation method was applied for the synthesis of the nanophotocatalyst. The SEM and XRD analyses showed a uniform distribution of titanium dioxide and iron nanoparticles on the zeolite. The furfural degradation could successfully happen at neutral to alkaline solutions. Moreover, increasing the amount of catalyst from 0.5 to 1.5 g/L does not have signi cant e ects on the degradation e ciency. By enhancing the initial concentration of furfural from 75 to 300 mg/L, the rate of degradation decreases.The maximum e ciency of 98% could be achieved for 75 mg/L solution by using 1.5 g/L catalyst in pH equal to 8 within 120 minutes.

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Section: E Ect Of the Furfural Initial Concentrationsupporting

confidence: 94%

Degradation of furfural in contaminated water by titanium and iron oxide nanophotocatalysts based on the natural zeolite (clinoptilolite)

2017

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“…As mentioned, the number and the lifetime of free carriers (electrons/holes) are particle size-and dopant-dependent. Doping of ZnS with other transition metal ions offers a way to trap charge carriers and extend the lifetime of one or both of the charge carriers (Scheme 2) [54]. Table 1 illustrates the application of some prepared QDs by different methods in the photocatalytic degradation of pollutants [55][56][57][58][59][60][61][62][63][64][65][66][67][68][69].…”

Section: Oh O Dye Co H O Small Lesstoxicspeciesmentioning

confidence: 99%

Photocatalytic Activity of Quantum Dots

Rajabi¹

2016

Semiconductor Photocatalysis - Materials, Mechanisms and Applications

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In recent years, nanoscale semiconductors have attracted great interest due to their unique structural, optical and electronic properties, which arise due to their large surface-to-volume ratio and quantum confinement effect. Quantum dots (QDs) as zerodimensional semiconductor nanomaterials, which are confined to a size of 2-8 nm in three dimensions, are defined as particles with physical dimensions smaller than the exciton Bohr radius. One of the attractive research fields in recent years is the synthesis of various sizes and shapes of semiconductor material nanoparticles as doped with different dopants. The aim of this chapter is to focus on the photocatalytic activity of QDs as new, green and efficient nanophotocatalysts.

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“…Initially, the catalyst surface area available helped to increase degradation effi ciency but with a further increase of dye concentration (above 50 mg/L) active sites of the catalyst were fully occupied by dye molecules and no space was available for OH • radicals generation. The high concentration of dye would have acted as a fi lter for the incident light, which ultimately reduced degradation effi ciency 5, 30 .…”

Section: Effect Of Initial Dye Concentrationmentioning

confidence: 99%

Photocatalytic degradation of malachite green dye using doped and undoped ZnS nanoparticles

Tolia¹,

Chakraborty

Murthy

2012

Polish Journal of Chemical Technology

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In the present study, ZnS nanoparticles were prepared using the mechanochemical method. The ZnS nanoparticles prepared were doped with different concentrations of manganese using metal acetate and manganese acetate by mechanochemical method. The as-prepared particles were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The photocatalytic activity of the prepared nanoparticles samples, in the photocatalytic degradation of malachite green, had been investigated. The nanoparticles were photo induced, generating hole transfer for photocatalytic activity. The photodegradation of malachite green was observed at different pH (2-5) values, dye concentrations (10-100mg/L) and amount of ZnS nanoparticles (1-2.5 g/L). About 95% degradation of dye was observed on the addition of 2 g/L ZnS in 50 mg/L dye solution after 90 minutes illumination at 125 W. Degradation has been increased up to 99% using UV/nanoparticles/H 2 O 2 (50 mL/L) combined process. The degradation effi ciency was also compared using Mn doped ZnS nanoparticles (Zn 1-x Mn x S, where x = 0.01, 0.22 and 0.3). Maximum of 97% degradation was observed with 0.01% concentration of Mn. Kinetics study and performance of UV/ZnS, UV/ZnS/H 2 O 2 , UV/doped ZnS processes were evaluated to compare the effi ciency of different processes.

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Nanoparticles of zinc sulfide doped with manganese, nickel and copper as nanophotocatalyst in the degradation of organic dyes

Cited by 351 publications

References 33 publications

Degradation of furfural in contaminated water by titanium and iron oxide nanophotocatalysts based on the natural zeolite (clinoptilolite)

Degradation of furfural in contaminated water by titanium and iron oxide nanophotocatalysts based on the natural zeolite (clinoptilolite)

Photocatalytic Activity of Quantum Dots

Photocatalytic degradation of malachite green dye using doped and undoped ZnS nanoparticles

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