TiO2 Nanoparticles with Mixed Anatase–Rutile Phase Structure Doped with Different Concentrations of Iron for Photocatalytic Activity in Degrading Methylene Blue
Paulus Lobo Gareso, Heryanto Heryanto, Sri Suryani, Dahlang Tahir, Paulina Taba, Didik Aryanto, Muh Ade Artasasta
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引用次数: 0
Abstract
The photodegradation of Fe-doped anatase-rutile mixed-phase TiO2 nanoparticles (NPs) under visible light to degrade methylene blue has been studied. TiO2 NPs were successfully synthesized using the co-precipitation method. These nanoparticles were characterized using XRD, UV–Vis, FTIR, FESEM, HRTEM, and EDX. The XRD analysis revealed that the diffraction patterns exhibited two-phase structures, namely, anatase and rutile phase structures, where the intensity of the rutile phase structures was greater than that of the anatase phase structures. The UV–Vis result indicated a reduction of the band-gap energy of the Fe-TiO2 NPs. FESEM micrographs revealed that agglomerations formed clusters, and SEM results showed that the nanoparticles aggregate to create surface structures resembling edelweiss flowers. Based on Kramers–Kronig analysis, there is a reduction in optical phonon \((\Delta ({\text{LO}} - {\text{TO}}))\) cm−1 difference with a decrease in the rutile fraction as a function of Fe. The reduction in the rutile phase fraction correlated with a decrease in photocatalytic activity, indicating that the rutile phase plays a crucial role in the photodegradation process (1wt% achieved. \(k\)ads rate: 0.00273 min−1). These results suggest that Fe-doped anatase–rutile mixed-phase TiO2 nanoparticles are suitable as photocatalysts.
期刊介绍:
The Korean Journal of Chemical Engineering provides a global forum for the dissemination of research in chemical engineering. The Journal publishes significant research results obtained in the Asia-Pacific region, and simultaneously introduces recent technical progress made in other areas of the world to this region. Submitted research papers must be of potential industrial significance and specifically concerned with chemical engineering. The editors will give preference to papers having a clearly stated practical scope and applicability in the areas of chemical engineering, and to those where new theoretical concepts are supported by new experimental details. The Journal also regularly publishes featured reviews on emerging and industrially important subjects of chemical engineering as well as selected papers presented at international conferences on the subjects.