Highly efficient degradation of dyes by carbon quantum dots/N-doped zinc oxide (CQD/N-ZnO) photocatalyst and its compatibility on three different commercial dyes under daylight

Seenuvasan, Muthulingam; Lee, In Hwan; Uthirakumar, Periyayya

doi:10.1016/j.jcis.2015.05.046

Cited by 126 publications

(51 citation statements)

References 27 publications

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“…4 ZnO has been extensively researched due to its relative abundance, low cost, non-toxicity, and high electron mobility. [4][5][6][7] Unfortunately, ZnO mainly absorbs in the UV region of the electromagnetic spectrum, which accounts for only 4% of solar energy due to its large energy band gap (>3.1 eV). [8][9] This, in turn, yields a very low solarto-hydrogen (STH) conversion efficiency.…”

Section: Introductionmentioning

confidence: 99%

H:ZnO Nanorod-Based Photoanode Sensitized by CdS and Carbon Quantum Dots for Photoelectrochemical Water Splitting

et al. 2015

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We report a promising simple strategy for improving the performance of the photoanode for photoelectrochemical (PEC) water splitting. ZnO nanorods on an indium tin oxide glass substrate were synthesized by a hydrothermal method following calcinations in air at 500 °C for 2 h and pure ambient hydrogen at atmospheric pressure at 400 °C for 30 min. The hydrogenated ZnO (H:ZnO) sample shows an enhanced photocurrent in comparison to that of ZnO nanorods. To enhance the absorption in the visible light and near-infrared regions, H:ZnO nanorods were sensitized by cadmium sulfide (CdS) nanoparticles and carbon quantum dots (CQDs). The H:ZnO nanorod film sensitized in this way exhibited significantly improved PEC properties after treatment with ambient nitrogen at 400 °C for 30 min. The optimized H:ZnO nanorod sample sensitized by CdS and CQDs yields a photocurrent density of ∼12.82 mA/cm 2 at 0 V (vs saturated calomel electrode (SCE)) in 0.25 M Na 2 S and 0.35 M Na 2 SO 3 solution under the illumination of simulated solar light (100 mW/cm 2 from a 150 W xenon Arc lamp source). The optimal structure shows a solarto-hydrogen conversion efficiency of ∼3.85% (at −0.67 V vs SCE). The H 2 gas generation obtained using this optimal structure consisting of H:ZnO nanorods sensitized by CdS and CQDs was 7.04 mL/cm 2 in 1 h. The morphology and properties of the samples were examined by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, ultraviolet−visible absorption, and electrical measurements.

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Section: Introductionmentioning

confidence: 99%

H:ZnO Nanorod-Based Photoanode Sensitized by CdS and Carbon Quantum Dots for Photoelectrochemical Water Splitting

et al. 2015

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“…Res. 5(4), 251-261 252 Especially, the semiconductor nanocrystals, the so-called quantum dots (QDs), well-known multifunctional materials, are a newly emerging nanomaterial for degradation of pollutants [12][13][14]. S.Muthulingam et al [12] synthesized carbon quantum dots/N-doped zinc oxide (CQD/N-ZnO) photo-catalyst successfully and the excellent efficiency of the photo-catalyst towards degradation of dyes was perceived.…”

Section: Issn: 2320-5407mentioning

confidence: 99%

“…(2) - (5)), whereas the valence band holes can directly oxidize organic pollutants adsorbed on the surface of catalyst (QDs) or mineralized them indirectly through hydroxyl radicals (•OH) generated by the reaction of holes and water molecules (H 2 O) or chemisorbed (OH − ) (Eqs. (6) - (8)) [12][13][14]. Then, under visible-light irradiation, some photo-generated electrons can transfer from excited-state of adsorbed molecules to the conduction band (CB) On the other hand, because of CdSe QDs sensitized ZrBTC, a strong band exists between the CdSe QDs and the surface groups of ZrBTC.…”

Section: Photo-catalytic Dye Degradation Studies:-mentioning

confidence: 99%

Photo-Catalytic Behavior of Cdse QDS Sensitized Zr-(1,3,5-Benzene Tricarboxylic Acid) Metal-Organic Frameworks.

Gonthina¹,

Sreedhar²,

Rao³

2017

IJAR

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“…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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Highly efficient degradation of dyes by carbon quantum dots/N-doped zinc oxide (CQD/N-ZnO) photocatalyst and its compatibility on three different commercial dyes under daylight

Cited by 126 publications

References 27 publications

H:ZnO Nanorod-Based Photoanode Sensitized by CdS and Carbon Quantum Dots for Photoelectrochemical Water Splitting

H:ZnO Nanorod-Based Photoanode Sensitized by CdS and Carbon Quantum Dots for Photoelectrochemical Water Splitting

Photo-Catalytic Behavior of Cdse QDS Sensitized Zr-(1,3,5-Benzene Tricarboxylic Acid) Metal-Organic Frameworks.

Photocatalytic Activity of Quantum Dots

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