Activated carbon fiber (ACF) was modified with MnS nanoparticles to prepare MnS-ACF, and it was employed for preparation of MnS-ACF/TiO 2 composites with titanium (IV) n-butoxide (TNB). The properties of MnS-ACF/TiO 2 composites were characterized by XRD, SEM, and EDX. EDX results showed the presence of C, O, and Ti as major elements and traces of the metal elements Mn and S. The photocatlytic activity was evaluated by degradation of methyl blue (MB) and methyl orange (MO) dye. The results demonstrated that as-prepared samples could effectively photodegrade MB and MO under UV irradiation. Subsequently, the decomposition of MB solution showed the combined effects of adsorptions by ACF and enhanced photocatalytic effect by TiO 2 . Finally, the photocatalytic effect increased due to photo-induced-electron absorption effect by ACF and electron trap effect by comodified MnS nanoparticles.
This paper introduces a microwave-assisted synthesis method to prepare hybrid Bi 2 Se 3-GR/TiO 2 nanocomposites, which exhibit superior properties over single component materials. The as-prepared composites were characterized by XRD, UV-vis absorbance spectra, SEM,TEM, EDX, and BET analyses, revealing uniform covering of the graphene nanosheet with Bi 2 Se 3 and TiO 2 nanocrystals. For visible light photocatalysis of Rh.B, a significant enhancement in the reaction rate was consequently observed with Bi 2 Se 3-GR/TiO 2 composites. The degradation rate(k app) obtained for sonophotocatalysis was 6.8× 10-3 min-1 , roughly 2.2 times better than that of VL photocatalysis under higher concentrations of Rh.B. The sonophotocatalysis was faster due to greater formation of reactive radicals as well as an increase of the active surface area of the Bi 2 Se 3-GR/TiO 2 composites. The high activity is attributed to the synergetic effects of high charge mobility and red shift of the absorption edge of Bi 2 Se 3-GR/TiO 2 .
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