Visible light photocatalytic activity of chitosan/poly(vinyl alcohol)/TiOb>2b> nanocomposite for dye removal: taguchi-based optimization

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• 作者：Mohammad Hossein Rasoulifard ; Mir Saeed Seyed Dorraji and Vahideh Mozafari
• 刊名：Environmental Progress & Sustainable Energy
• 出版年：2017
• 出版时间：January, 2017
• 年：2017
• 卷：36
• 期：1
• 页码：66-72
• 全文大小：384K
• ISSN：1944-7450

文摘

This work describes the preparation of chitosan/poly (vinyl alcohol)/titanium dioxide (CS/PVA/TiOb>2b>) nanocomposite for its use as a photocatalyst under visible light irradiation. The prepared nanocomposite was characterized by Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The photocatalytic activity of CS/PVA/TiOb>2b> was evaluated by photocatalytic removal of acid red 14 (AR14) in aqueous solution as a model pollutant. A Taguchi orthogonal array experimental design with an Lb>16b> matrix was employed to optimize the factors affecting the photocatalytic efficiency of CS/PVA/TiOb>2b> nanocomposite such as: pH, irradiation time, initial dye concentration, and nanocomposite dosage. The optimum conditions were found to be as follows: pH = 3; irradiation time = 120 min; initial dye concentration = 10 mg L⁻¹, and nanocomposite dosage = 400 mg L⁻¹. The pH was found to be the most effective factor for dye removal, followed by the nanocomposite dosage. The dye removal during visible-CS/PVA/TiOb>2b> process under optimal conditions followed the pseudo-first-order reaction model with the rate constants of 0.0188 min⁻¹. The photocatalytic activity of CS/PVA/TiOb>2b> nanocomposite dropped very slightly in five consecutive reaction cycles.