Photodegradation study of TiO2-organoclay modified acetate cellulose bioplastic

International Symposium on Current Progress in Functional Materials

Krisnandi, Y.K.^1 ; D Rasanji, D.G.W.K.^1 ; Luthfiyah, S.Z.^1 ; Zahara^1 ; Sihombing, R.^1

Department of Chemistry, Faculty of Mathematics, Natural Sciences Universitas Indonesia, Kampus UI Depok, Depok

16424, Indonesia^1

关键词: biodegradable;    Bioplastics;    Nanofiller;    Organobentonites;    TiO2;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/188/1/012059/pdf
DOI  :  10.1088/1757-899X/188/1/012059

来源: IOP

【 摘 要 】

Biodegradable cellulose acetate films have been synthesized using TiO2modified organobentonite as nanofiller. The aim of titania addition is to add photocatalyst to the biocomposite, so it has self-photodegradation properties. Organobentonite was prepared from Tapanuli bentonite, previously purification and Na+-exchanged, modified with cationic surfactant hexadceyltrimethylammonium bromide (HDTMABr). The composition of bioplastic cellulose acetate was 7 wt.% organobentonite and certain amount of TiO2(0 wt.%, 1 wt.%, 3 wt.%, 5 wt.%, 10 wt.%) of the total composite weight. Fabrication of nanocomposite film was carried out using acetone as solvent and through solvent casting method. FTIR analysis showed the intercalation with surfactant was successfully carried out, indicated by new absorption band at 2636 cm-1and 2569 cm-1. Nanocomposite application in photodegradation test was carried out under direct sunlight irradiation, UV light, and without irradiation for thirty days. It is found that the greater the amount of TiO2added into the composites, the more weight loss occurred due to photodegredation. Percent weight loss in the UV light irradiation are 4.02%, 13.45%, 18.66%, 22.35%, 27.86%, respectively for (TiO20 wt.%, 1 wt.%, 3 wt.%, 5 wt.%, 10 wt.%). While for bioplastic irradiated by direct sunlight, the weight loss was 2.15%, 8.49%, 13.85%, 14.70%, 15.02%, respectively. In contrast, without irradiation, the weight reduction of bioplastic was insignificant. The results indicate that the addition of TiO2to the composition of bioplastic has given the ability of self-photodegradation to the composite.