Photocatalytic degradation of malathion using Zn2+-doped TiO2 nanoparticles: statistical analysis and optimization of operating parameters

(2018) Photocatalytic degradation of malathion using Zn2+-doped TiO2 nanoparticles: statistical analysis and optimization of operating parameters. Applied Physics A: Materials Science and Processing.

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Abstract

A Zn2+-doped TiO2 is successfully synthesized by a facile photodeposition method and used in the catalytic photo-degradation of organophosphorus pesticide, malathion. The obtained photocatalysts are characterized in detail by X-ray diffraction (XRD), Brunauer�Emmett�Teller (BET), Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). XRD results confirm the formation of the anatase and rutile phases for the Zn2+-doped TiO2 nanoparticles, with crystallite sizes of 12.9 nm. Zn2+-doped TiO2 that was synthesized by 3.0wt Zn doping at 200 °C exhibited the best photocatalytic activity. 60 sets of experiments were conducted using response surface methodology (RSM) by adjusting five operating parameters, i.e. initial malathion concentration, catalyst dose, pH, reaction time at five levels and presence or absence of UV light. The analysis revealed that all considered parameters are significant in the degradation process in their linear terms. The optimum values of the variables were found to be 177.59 mg/L, 0.99 g/L, 10.99 and 81.04 min for initial malathion concentration, catalyst dose, pH and reaction time, respectively, under UV irradiation (UV ON). Under the optimized conditions, the experimental values of degradation and mineralization were 98 and 74, respectively. Moreover, the effects of competing anions and H2O2 on photocatalyst process were also investigated. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.

Item Type: Article
Additional Information: cited By 0
Keywords: Catalysts; Electron microscopy; Field emission microscopes; High resolution transmission electron microscopy; Irradiation; Nanoparticles; Oxide minerals; Photocatalysts; Scanning electron microscopy; Titanium dioxide; Transmission electron microscopy; X ray diffraction; Zinc, Field emission scanning electron microscopy; Operating parameters; Optimized conditions; Organophos-phorus pesticides; Photo catalytic degradation; Photocatalytic activities; Response surface methodology; TiO2 nano-particles, Titanium compounds
Subjects: Environmental health
Divisions: Education Vice-Chancellor Department > Faculty of Health > Department of Environmental Health Engineering
Depositing User: دکتر مهری غلامی
URI: http://eprints.abzums.ac.ir/id/eprint/2627

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