Room temperature synthesis of TiO2 supported chitosan photocatalyst: Study on physicochemical and adsorption photo-decolorization properties. (February 2017)

• Record Type: Journal Article
• Authors: Afzal, Saba; Samsudin, Emy Marlina; Mun, Lee Kian; Julkapli, Nurhidayatullaili Muhd; Hamid, Sharifah Bee Abd
• Is Part Of: Materials research bulletin. Volume 86(2017)
• Page Start: 24
• Page End: 29
• Publication Date: 2017-02
• Subjects: A. Composites -- A. Semiconductors -- B. Sol gel chemistry -- C. X-ray diffraction -- D. Catalytic properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2016.09.028
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Room temperature modification of TiO2 with CS. Impact of CS on charge carrier recombination rate. Decline in adsorption-photodecolorization property with calcination treatment. Abstract: The room temperature in-situ sol gel technique was used to synthesize TiO2 supported chitosan (CS) nanocomposites. The effect of calcination was assessed in the context of its physicochemical and adsorption-photodecolorization properties. During sol gel, hydrolysis and condensation of titanium alkoxide was conducted under acidic conditions, which resulted in the formation of crystalline anatase phase in TiO2 -CS (TC) composite at room temperature. Furthermore, calcination treatments (100 °C, 300 °C, 500 °C) gradually increased the charge carrier recombination rates, due to the thermal degradation of Chitosan. Photocatalytic activity was assessed using Methyl orange, which resulted in 100% decolorization within 90 min of UV exposure with un-calcined nanocomposite. Hence, the reactive OH and NH2 functional groups on the surface of CS are responsible for the adsorption-photodecolorization process. Overall, this study provides comprehensive data on the effective modification of TiO2 with Chitosan and the effect of calcination on the physicochemical and adsorption-photodecolorization properties of the TC nanocomposite.