Incorporation of chitosan and glass substrate for improvement in adsorption, separation, and stability of TiO2 photodegradation

Abstract

It is demonstrated that single titanium dioxide (TiO 2 ) has high potential for photodegradation of pollutants. However, it is still far from becoming an effective photocatalyst system, due to issues of adsorption process, separation, as well as dissolution. Therefore, this study highlights the high adsorption capacity, simplified separation, and the promising stability of TiO 2(SY) (synthesized via sol-gel method) photocatalyst, fabricated using chitosan-TiO 2(SY) and supported by glass substrate (CsTiO 2(SY) /glass substrate) photocatalysts. Chitosan (Cs), with abundant -R-NH and NH 2 groups, promotes the adsorption sites of methyl orange (MO) and OH groups for major attachment to TiO 2(SY) . Meanwhile, the glass substrate increases stability and assists separation of the photocatalysts. Initially, nano-TiO 2(SY) has been characterized using high-resolution transmission electron microscope. Cs-TiO 2(SY) /glass substrate was fabricated via dip-coating. The distribution and interface between the photocatalytic components were characterized by Fourier transform infrared absorption spectroscopy, UV-Vis diffuse reflectance spectroscopy, field emission scanning electron microscopy, and energy-dispersive spectrometer. UV-Vis analysis of the multilayer photocatalyst (2, 4, 6, and 8 layers) was further carried out by the adsorption-photodegradation, with MO as model of pollutant. Seventy percent of the total removal of MO via optimized eight layers of photocatalyst was achieved within 1 h of UV irradiation. The adsorption photocatalyst achieved 50 % with no exposure to UV light for 15 min of irradiation. It is concluded that suitable photocatalytic conditions and sample parameters possessing the multilayer photocatalyst of Cs-TiO 2(SY) are beneficial toward the adsorption-photodegradation process in wastewater treatment.

TiO2/Chitosan bioplastic as Antibacterial of Stephylococcus aureus for Food Preservation

“…Compare to pure chitosan bioplastic, there were shifting of hydroxyl bonds, amino bonds, and amide bonds of TiO2 incorporated chitosan bioplastic. The changes caused by interaction between chitosan molecules and TiO2 nanoparticles (Haldorai & Shim, 2014) which is shown by chitosan -TiO2 bonds on 450 -950 wavelength range (Amir, Julkapli, & Hamid, 2016).…”