Comparison of dye degradation efficiency using ZnO powders with various size scales

Wang, Huihu; Xie, Changsheng; Zhang, Wei; Cai, Shuizhou; Yang, Zhihong; Gui, Yanghai

doi:10.1016/j.jhazmat.2006.07.021

Cited by 357 publications

(145 citation statements)

References 26 publications

(25 reference statements)

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“…The higher surface area of the photocatalyst significantly improves the redox reaction during the visible light irradiation and the surface properties led to influence the efficiency of catalyst [48]. Furthermore, the morphology of the photocatalyst also played a vital role to influence the final degradation efficiency as reported earlier [42,49]. The similar observation was reported by Saravanan et al, where, the spherical shaped nano zinc oxide exposed superior photocatalytic activity when compared with the spindle and rod shaped zinc oxide nanostructures [50].…”

Section: 1 Effect Of Photocatalystsupporting

confidence: 74%

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

Pandiyarajan

Saravanan

Karthikeyan

et al. 2016

J Mater Sci: Mater Electron

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A controlled synthesis of CuO nanostructures with various morphologies were successfully achieved by presence/absence of low frequency (42 kHz) ultrasound with two different methods. The size, shape and morphology of the CuO nanostructures were tailored by altering the ultrasound, mode of addition and solvent medium. The crystalline structure and molecular vibrational modes of the prepared nanostructures were analysed through X-ray diffraction and FTIR measurement, respectively which confirmed that the nanostructures were phase pure high-quality CuO with monoclinic crystal structure. The morphological evaluation and elemental composition analysis were done using TEM and EDS attached with SEM, respectively. Furthermore, we demonstrated that the prepared CuO nanostructures could be served as an effective photocatalyst towards the degradation of methyl orange (MO) under visible light irradiation. Among the various nanostructures, the spherical shape CuO nanostructures were found to have the better catalytic activities towards MO dye degradation. The catalytic degradation performance of MO in the presence of CuO nanostructures showed the following order: spherical \ nanorod \ layered oval \ nanoleaf \ triangular \ shuttles structures. The influence of loading and reusability of catalyst revealed that the efficiency of visible light assisted degradation of MO was effectively enhanced and more than 95 % of degradation was achieved after 3 cycles.

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Section: 1 Effect Of Photocatalystsupporting

confidence: 74%

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

Pandiyarajan

Saravanan

Karthikeyan

et al. 2016

J Mater Sci: Mater Electron

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“…Some AOPs have been studied recently including combinative applications of complementary technologies for organic compounds degradation in effluents such as ozonation, Fenton and Photo-Fenton, electro-Fenton, UV/photoelectroFenton, electro-Fenton and peroxicoagulation, UV/ozone (O 3 ), UV/hydrogen peroxide (H 2 O 2 ), UV/titanium dioxide (TiO 2 ), and UV/ZnO [5][6][7][8][9]. TiO 2 and ZnO are effective semiconductors, relatively cheap and nontoxic, both of which are being evaluated for respective photocatalytic efficiency [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Photocatalytic Degradation of Dairy Wastewater Using Immobilized ZnO

Samanamud

Loures

Souza

et al. 2012

ISRN Chemical Engineering

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This work evaluated the efficiency and systemic application of heterogeneous photocatalytic degradation for dairy wastewater under advanced oxidation process (AOP) utilizing solar radiation and immobilized ZnO as measured by total organic carbon (TOC). The AOP system consisted of a semibatch reactor and glass tank operated with an initial volume of 3 L of dairy wastewater. ZnO was immobilized on a metal plate of 800 × 250 mm and used as a catalyst bed. Evaporation rate was considered when effective degradation of the photocatalytic system was determined. The AOP utilized Taguchi's L 8 orthogonal array. The entry variables were pH, reaction time, initial organic load in the effluent, and ZnO coating thickness on the catalyst bed. When optimized, an effective TOC degradation of 14.23% was obtained under variable values of pH 8.0, a metal-plate coating of 100 micrometers (µm) ZnO, and total reaction time of 180 min.

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“…Studies have shown that the performance of ZnO under visible light is much more efficient than TiO 2 [173][174][175]. 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.…”

Section: Zinc Oxide As a Photocatalystmentioning

confidence: 99%

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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Comparison of dye degradation efficiency using ZnO powders with various size scales

Cited by 357 publications

References 26 publications

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

Heterogeneous Photocatalytic Degradation of Dairy Wastewater Using Immobilized ZnO

Metal oxide semiconducting interfacial layers for photovoltaic and photocatalytic applications

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