Green technique of visible light active titanium dioxide nanoparticles using starch for the degradation of organic pollutant
Year: 2023
Type: article
Abstract: ABSTRACT The design of titanium dioxide nanoparticles (TiO 2 NPs) is crucial. Therefore, the visible light-activated TiO 2 NPs were proposed using a sol-gel green method with reduced optical bandgap energy from 3.20 eV of pure anatase TiO 2 into 3.00 eV. The obtained electrochemical bandgap (2.81 eV) which was analyzed by cyclic voltammetry revealed an insignificant difference compared to the optical bandgap. X-ray diffraction analysis verified TiO 2 NPs composed of an anatase-brookite phase with a crystallite size of 8 nm. The particle size of TiO 2 NPs was confirmed by high-resolution transmission electron microscopy analysis (11.63 ± 1.47 nm). Due to the high photocatalytic performance of the mixed-phase TiO 2 NPs, the optimum concentration (6 ppm) of neutral red (NR) dye was completely degraded within 30 min under visible light. Photoluminescence analysis revealed the improved electron-hole separation of the synthesized TiO 2 NPs. • O 2 - acted as the predominant role of reactive oxygen species in the removal of NR dye. The degradation kinetics of NR obeyed the first-order kinetic and the adsorption data were fitted with the Langmuir isotherm model. TiO 2 NPs maintained over 90% of its initial photocatalytic efficiency after five cycles. Thus, this study suggests that the TiO 2 NPs have good potential as an effective photocatalyst in wastewater treatment.
Source: Desalination and Water Treatment
Institutions: Universiti Sains Malaysia, Anton Paar (Austria)
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,000
OpenAlex ID: W4367537583