Recent developments of zinc oxide based photocatalyst in water treatment technology: A review

Lee, Kian Mun; Lai, Chin Wei; Ngai, Koh Sing; Juan, Joon Ching

doi:10.1016/j.watres.2015.09.045

Cited by 1,929 publications

(800 citation statements)

References 221 publications

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“…As shown in Table 2, the rate constant values k obs (min −1 ) were lower in fluorescent light compared with that under LED light for both dyes. Figures S3 and S4) [16]. On the contrary, when a colored organic compound is present, a sensitized photocatalytic process is possible.…”

Section: Kinetic Analysismentioning

confidence: 96%

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Photocatalytic Decolorization of Dye with Self-Dye-Sensitization under Fluorescent Light Irradiation

et al. 2017

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Abstract:A dye-sensitization technique was applied to effective catalysts-TiO 2 and ZnO-under fluorescent light irradiation for Orange II (OII) and Methyl Orange (MO) degradations. Treatments were carried out at different time periods using 20 mg of catalysts and 30 mL of 5 mg/L of OII and MO. The degradation efficiency of OII and MO increased with increasing irradiation time under irradiation of fluorescent light. The photocatalytic activity of ZnO nanoparticles was better compared with that of TiO 2 for MO; and the ZnO activity was the same as TiO 2 for OII photodegradation. Kinetic behavior was evaluated in terms of the Langmuir-Hinshelwood model (pseudo-first order kinetic). The possible mechanism of photodegradation under fluorescent light was discussed.

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Section: Kinetic Analysismentioning

confidence: 96%

“…TiO2 and ZnO cannot absorb visible light energy directly due to the band gap 3.2 eV (Supplementary Data Figures S3 and S4) [16]. On the contrary, when a colored organic compound is present, a sensitized photocatalytic process is possible.…”

Section: Proposed Degradation Mechanismsmentioning

confidence: 99%

Photocatalytic Decolorization of Dye with Self-Dye-Sensitization under Fluorescent Light Irradiation

et al. 2017

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“…В качестве таких центров выступают поверхностные дефекты [24]. Поскольку многослойные золь-гель сформированные пленки ZnO поликристалличны по структуре и име-ют поверхность с развитым рельефом, роль дефектов кристаллической решетки у поверхности кристаллитов становится определяющей.…”

Section: обсуждение результатовunclassified

Оптические Свойства Многослойных Золь-Гель Пленок Оксида Цинка

Денисов¹,

Чубенко²,

Бондаренко³

et al. 2018

Физика И Техника Полупроводников

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Study of structural, optical and photocatalytic properties of multilayered (1–8 layers) zinc oxide films deposited on glass substrates by sol-gel method showed, that after thermal treatment at 500°C they consist of random oriented hexagonal crystalline grains with size of 34–40 nm, forming larger particles with sizes of 100–150 nm, which do not depend on number of layers. With an increase in the number of layers, the intensity of exciton photoluminescence decreases by a factor of 10, the absorption of light in the visible and near IR ranges increases, and the efficiency of photocatalytic decomposition of the test organic dye rhodamine B increases by 10–12%. The observed changes are related to the increase in the total area of grain boundaries and to the change in the integral amount of oxygen vacancies and interstitial atoms as the number of layers increases, which makes it possible to control the properties of zinc oxide films for applications in optoelectronics, photovoltaics and photocatalysis.

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“…The enhancement in photodegradation activity which is observed at high ZnO loading could be attributed to the increased in total surface area and total number of active sites on the catalyst surface. This leads to the increase in the number of hydroxyl and superoxide radicals in the catalyst material which facilitates the overall degradation of methylene blue dye [19]. …”

Section: Photocatalytic Applicationmentioning

confidence: 99%

Green Synthesis of ZnO Nanoparticles by an Alginate Mediated Ion-Exchange Process and a case study for Photocatalysis of Methylene Blue Dye

Keong

Vivek

Salamatinia

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. In this study, zinc oxide (ZnO) was prepared via extrusion-dripping method through an ion exchange mediated process using sodium alginate. The samples were synthesized at 500 ˚C and 600 ˚C to study the effect of calcination temperature. The morphology, microstructure and optical activity of the calcined ZnO nanoparticles were analyzed by TGA, FESEM and XRD. It was found that ZnO nanoparticles synthesized at 600 ˚C was of higher purity with high crystallinity. To enhance the photocatalytic efficiency of zinc oxide, ZnO/NCC films were synthesized at varying ZnO loading fractions of 10 wt%, 15 wt%, 20 wt% and 25 wt% and were evaluated by photodegradation of Methylene blue dye and the highest dye percentage removal is found to be 96% which is obtained at ZnO loadings of 25 wt%. The usage of ionexchange process has shown promising results in producing ZnO of desirable characteristics.

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Recent developments of zinc oxide based photocatalyst in water treatment technology: A review

Cited by 1,929 publications

References 221 publications

Photocatalytic Decolorization of Dye with Self-Dye-Sensitization under Fluorescent Light Irradiation

Photocatalytic Decolorization of Dye with Self-Dye-Sensitization under Fluorescent Light Irradiation

Оптические Свойства Многослойных Золь-Гель Пленок Оксида Цинка

Green Synthesis of ZnO Nanoparticles by an Alginate Mediated Ion-Exchange Process and a case study for Photocatalysis of Methylene Blue Dye

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