Preparation of TiO₂/Bio-Composite Film by Sol-Gel Method in VOCs Photocatalytic Degradation Process

Abstract

Biodegradable of polylactic acid (PLA), polybutylene adipate-co-terephthalate (PBAT) and polybutylene succinate (PBS), which were biodegradable aliphatic polyesters, composite films were contained with titanium dioxide (TiO2) as a photocatalyst to evaluate the photocatalytic activity of bidegradable composite films for toluene removal. The synthesized TiO2 was prepared by sol-gel method between titanium isopropoxide with acetic acid. To form the anatase structure, it was calcined at 500°C. TiO2 were added to PLA/PBAT/PBS as a biopolymer blend at 0, 5 and 10 wt% .The TiO2/Bio-composite films were fabricated via blown film technique to produce 40 μm films. Photocatalytic activity efficiency of TiO2/Bio-composite films was performed in an annular closed system under UV light. Since the amount of TiO2 affected the efficiency of the photocatalytic activity, this work was mainly concentrated on the effort to embed the high amount of TiO2 in the biopolymer matrix. The developed photocatalyst was characterized by XRD, UV-Vis spectrophotometer and SEM. The SEM images revealed the high homogeneity of the deposition of TiO2 on the biopolymer matrix. The X-ray diffraction (XRD) ensures the deposition of TiO2 as crystalline anatase phase. In addition, the photocatalytic results shown that the toluene removal efficiencies increased with an increasing TiO2 dosages at 0 wt%, 5 wt%, and 10 wt% , respectively. As aspects, the photocatalytic degradation results showed the highest tolune photocatalytic degradation efficiency of 52.0% at 10 wt% TiO2 .

Photocatalytic Oxidation of PLA/TiO2-Composite Films for Indoor Air Purification

“…During the heating phase of the blown film method, aggregation of the TiO 2 particles could occur. 47 EDX mapping of the PLA and the PLA/TiO 2 -composite films is described in Table 1 .…”

Insights into Biodegradable Polymer-Supported Titanium Dioxide Photocatalysts for Environmental Remediation

“…Despite the dynamic and promising character of natural polymers towards the synthesis of effective TiO2-photocatalysts, in many studies, the fabrication of a synthetic non-biodegradable polymer in a combination way seems vital in order to construct stable and more durable structures. However, limited attempts were made to combine natural and synthetic biodegradable polymers in this field, as reported in few studies [6,7].…”

“…With an interesting approach concerning the combination between different types of biodegradable polymers, Kreetachat et al [7] investigated the design of bio-composite films destined for toluene removal. According to the authors, TiO 2 was added in different concentrations to a blend containing three different biodegradable polymers such as PLA, poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate) (PBS).…”

“…For the synthesis of a as called "bio-composite" film, another team combined three different biodegradable polymers, namely poly(lactic acid) (PLA), poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate) (PBS), employing a blown film method (twin screw extruder) to disperse TiO 2 nanoparticles in the polymeric matrix. The new eco-friendly materials exhibited good photocatalytic performance for volatile organic compounds' (VOCs) removal [7].…”

Hybrid and Hierarchical Composite Materials

“…Several processing methods or routes are used in the development of hierarchical composite structures. Some of the important routes include sol-gel processing (Kreetachat et al 2013), rapid prototyping, layer-by-layer growth (Jan and Kotov 2007), solvent-evaporation induced selfassembly (EISA) technique (Zhang et al 2003), coprecipitation (Gee and Hong 2003), alkaline treatment of collagen matrix (Rocha et al 2002), calcification of HA-containing hydrogel (Furuichi et al 2006), as well as thermal decomposition of organometallic compounds. The most conventional composite fabrication methods employed are mechanical mixing and coprecipitation (Zhang et al 2003;Yin et al 2000;Wei and Ma 2004a;Taguchi et al 1999Doi et al 1996.…”