Repository of Research and Investigative Information

Repository of Research and Investigative Information

Baqiyatallah University of Medical Sciences

Cu doped TiO2-Bi2O3 nanocomposite for degradation of azo dye in aqueous solution: Process modeling and optimization using central composite design

(2019) Cu doped TiO2-Bi2O3 nanocomposite for degradation of azo dye in aqueous solution: Process modeling and optimization using central composite design. Journal of Environmental Chemical Engineering. p. 8. ISSN 2213-2929

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Abstract

Cu doped TiO2-Bi2O3 hybrid as a visible active photocatalyst was syhthesized by a sol-gel method and the weight fraction of Cu (1-5 wt. ), and Bi2O3 (3-8 wt. ) was optimized using response surface methodology. The photodegradation of methyl orange (MO) was carried out to evaluate photoactivity properties of the prepared samples under visible light irradiation. The Cu-TiO2-Bi2O3 nanocomposite with a weight fraction of 1 and 8 for Cu and Bi2O3 has the best photocatalytic activity for MO degradation. The characteristics of photocatalyst with optimum composite (1 wt. of Cu and 8 wt. Bi2O3) were also investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and diffuse reflectance spectra (DRS). The DRS spectra approved that the adsorption wavelength of Cu doped TiO2-Bi2O3 is in the visible light range (470 nm). The influence of amount of catalyst (0.8-1.2 g L-1), MO concentration (10-20 mg L-1) and initial pH of the solution(4-6) in on MO photodegradation was modeled and optimized using central composite designe based on response surface methodology. The value of MO removal decreases by about 15 when MO concentration increases from 10 to 20 mg L-1. Maximum dye removal was achieved about 74 at 10 mg L-1 of MO, 1.2 g L-1 catalyst loading and pH of 4.

Item Type: Article
Keywords: Azo dye Recalcitrant compounds Titanium dioxide Photocatalysis Response surface methodology advanced oxidation processes textile waste-water methyl-orange photocatalytic degradation removal tio2 photodegradation bi2o3/tio2 pollutants cu2o/tio2 Engineering
Divisions:
Page Range: p. 8
Journal or Publication Title: Journal of Environmental Chemical Engineering
Journal Index: ISI
Volume: 7
Number: 3
Identification Number: https://doi.org/10.1016/j.jece.2019.103078
ISSN: 2213-2929
Depositing User: مهندس مهدی شریفی
URI: http://eprints.bmsu.ac.ir/id/eprint/2537

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