Asrianti Bt. Sunardi, Nandang Mufti, Hari Wisodo, Hendri Widiyandari
Carbon Quantum-dot (CQD) has great potential in enhancing the photocatalytic performance of TiO2 materials and their optical absorption into visible light. In this study, CQD was successfully synthesized using the hydrothermal method at 160°C for 8 hours and the TiO2/CQD composite was successfully synthesized using the hydrothermal method at 100°C for 8 hours. XRD characterization results show The peak positions in the patterns for TiO2 and TiO2/CQD matched with those for standard TiO2 anatase and the peak for CQD could not be observed in TiO2/CQD composites because of their amorphous nature and very low content. FTIR characterization was carried out to determine the functional groups and UV-Vis to determine the optical and photocatalytic properties. FTIR results showed that the peak of O-H stretching at 3500 – 3250 cm–1, C-O stretching at 1400 cm–1, C=C bonding at 1625 cm–1, and Ti-O stretching below 1000 cm–1came from samples containing TiO2. The results of UV-Vis analysis show that the TiO2/CQD absorption region is around 300 – 320 nm towards the visible light region. The band gap energy of TiO2 is 3.44 eV, after the addition of CQD the band gap energy is reduced to 3.41 eV so that it can increase the photocatalyst activity. © 2025 American Institute of Physics Inc.. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang, 65145, Indonesia; Centre of Material for Renewable Energy, Universitas Negeri Malang, Malang, 65145, Indonesia; Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Jl. Ir. Sutami 36 A, Central Java, Surakarta, 57126, Indonesia
