eng Science and Education Publishing American Journal of Nanomaterials 2372-3122 2019-09-09 7 1 39 45 10.12691/ajn-7-1-5 AJN2019715 article Siti Lailatul N. Zulmajdi 1 Nur Izzah I. Zamri 1 Abdul Hanif Mahadi 2 Mohd Yameany H. Rosli 3 Fairuzeta Ja’afar 3 Hartini M. Yasin 3 Eny Kusrini 4 Jonathan Hobley 4 5 6 Anwar Usman anwar.usman@ubd.edu.bn 6 Department of Chemistry, Faculty of Science, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Brunei Darussalam Centre for Advanced Material and Energy Sciences, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Negara Brunei Darussalam Physical & Geological Science Department, Universiti Brunei Darussalam, Jalan Tungku Link, Gadong BE1410, Negara Brunei Darussalam Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia This paper describes the photocatalytic degradation of methylene blue (MB) in aqueous solution in the presence of TiO2 nanoparticles (NPs) in different compositions of anatase and rutile phases under UV light irradiation. The different compositions of crystalline phases of TiO2 NPs were synthesized using sol-gel method at the same temperature for various calcination times. The TiO2 NPs were subjected to crystal phase, vibrational, size, and morphological characterizations. The photocatalytic degradation of MB revealed that anatase TiO2 NPs have a superior catalytic activity in the front of rutile phase. This finding further suggested that low charge resistance and low electron-hole recombination probability lead to the acceleration of the OH? formation on the surface of anatase TiO2 NPs. http://pubs.sciepub.com/ajn/7/1/5/ajn-7-1-5.pdf photocatalysis; titania; sol-gel; calcination time; methylene blue