Synthesis, Luminescence and Thermal Properties of PVA–ZnO–Al2O3 Composite Films: Towards Fabrication of Sunlight-Induced Catalyst for Organic Dye Removal
Poly(vinyl alcohol) (PVA)–ZnO–Al2O3 composite films have been prepared by the addition of different compositions of ZnO and Al2O3 through solvent casting method. Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–Vis) and photoluminescence spectroscopy (PL) spectra revealed the successful incorporation of ZnO and Al2O3 onto PVA and interactions among ZnO, Al2O3 and PVA molecules. PL data indeed showed the enhanced luminescence property of composite films compared with the PVA. Thermogravimetric analysis (TGA) data showed that thermal stability of PVA–ZnO–Al2O3 composite films could be greatly improved by the incorporation of ZnO and Al2O3 into the system. The glass transition temperature (Tg) were increased for the composite samples using ZnO and Al2O3. Differential scanning calorimetry (DSC) measurements revealed that the melting temperature (Tm) of PVA–ZnO–Al2O3 composite films are significantly higher (~ 12 to 25 °C) than PVA. The photocatalytic measurements exhibited better photocatalytic degradation ability of PVA–ZnO–Al2O3 composites over PVA. Such photocatalytic capacity makes the PVA–ZnO–Al2O3 composite films promising candidates for the removal of organic dyes for water purification.
KeywordsPVA–ZnO–Al2O3 composite films Synthesis Photoluminescence property Thermal stability Photocatalytic activity
The authors gratefully acknowledge Organic and Materials Chemistry Laboratory of the Chemistry Department, SUST for supporting experimental works.
- 12.Lagashetty A, basavaraj S, Bedre M, Venkatarman A (2009) Metal oxides dispersed polyvinyl alcohol nanocomposites. J Metall Mater Sci 51:297–306Google Scholar
- 14.Karthikeyan K, Poornaprakash N, Selvakumar N, Jeyasubrmanian K (2009) Thermal properties and morphology of MgO-PVA nanocomposite film. J Nanostruct Polym Nanocompd 5:83–88Google Scholar
- 22.Aga Mu (2010) Doping of polymers with zno nanostructures for optoelectronic and sensor applications. Nanowires Science and Technology. Intech, RijekaGoogle Scholar
- 25.Subramani NK, Shilpa KN, Shivanna S, Siddaramaiah H (2016) Highly flexible and visibly transparent poly(vinyl alcohol)/calcium zincate nanocomposite films for UVA shielding applications as assessed by novel ultraviolet photon induced fluorescence quenching. Macromolecules 49(7):2791–2801CrossRefGoogle Scholar
- 33.Varghese N, Hariharan M, Cherian AB, Sreenivasan PV, Paul J, Antony AK A (2014) PVA-assisted synthesis and characterization of nano α-alumina. Int J Sci Res Publ 4:1–5Google Scholar
- 34.Rao NR (1967) Ultraviolet and visible spectroscopy. Chemical applications, Butterworth, LondonGoogle Scholar
- 38.Zak AK, Razali R, Majid WHA, Darroudi M (2011) Synthesis and characterization of a narrow size distribution of zinc oxide nanoparticles. Int J Nanomed 6:1399–1403Google Scholar
- 45.Gilman JW, Van der Hart DL, Kashiwagi T (1994) Fire and polymers II: materials and test for hazard prevention, American Chemical Society, ACS Symposium Series 599, August 21–26, Washington, DCGoogle Scholar
- 48.Rahman Khan MM, Wee YK, Mahmood WAK (2014) Effect of CuO on the thermal stability of polyaniline nanofibers. Int J Chem React Eng 12:1–7Google Scholar