Photocatalytic Effect for TiO₂/ACF Composite Electrochemically Prepared with TNB Electrolyte

Abstract

TiO 2 /ACF composites were prepared by the electrochemical method with Titanium (IV) n-butoxide (TNB) electrolyte under different electrochemical operation time. The BET surface area for TiO 2 /ACF composites decrease with the increase of electrochemical operation time. There is a single crystal structure which is anatase in all of the samples from the data of XRD. The SEM micrphotographs of TiO 2 /ACF composites show that the TiO 2 particles were well mixed with the ACF. There are O and P with strong C and Ti peaks in all samples from EDX results, and it also shows that a decrease of the C content with a increasing of Ti content with increasing of the electrochemical operation time in the over all composites. DSC cures show that the exothermic peak of all composites at 560 o C represents the transformation heat of amorphous parts to anatase phase and the discontinuous grain growth of the transformed anatase particles. Finally, the excellent photoactivity of TiO 2 /ACF composites (especially, ACFT10) could be attributed that the decrease of concentration of MB can be concluded to be much faster for the adsorption by ACF than for photocatalytic decomposition by TiO 2 .

Fabrication of Zn-treated ACF/TiO2 Composites and Their Photocataytic Activity for Degradation of Methylene Blue

“…Uddin et al have studied the influence of TiO 2 and ZnO photocatalysts on adsorption and degradation behaviour of Erythrosine. 13) The photocatalytic activity for degradation of methyl orange using the nanosized TiO 2 /ZnO composite catalyst has been reported by Liao et al 14) In previous works, 15,16) it was found that TiO 2 /ACF composite has excellent photocatalytic activity in the degradation of methyl blue (MB), which is a representative azo dye. However, the influences of ZnO on photocatalyst TiO 2 /ACF in the degradation of MB, and the effect of ZnO on the photocatalytic activity of TiO 2 /ACF, are not known well.…”

“…The result is in accordance with references. 15,16) However, for the Zn-treated ACF/TiO 2 composites, the peaks at 25.3, 37.8, 48.0 and 62.5 are the diffractions of (101), (004), (200) and (204) planes of anatase, indicating the developed CNT/TiO 2 composites existed in anatase state. The peaks at 27.4, 36.1, 41.2 and 54.3 belong to the diffraction peaks of (110), (101), (111) and (211) of rutile.…”

Photocatalytic degradation of vehicle exhausts on asphalt pavement by TiO2/rubber composite structure

“…In order to investigate the efficiency of the CDP, indoor experiments were carried out by a static measurement, through the comparison of pure nano-TiO 2 and CDP crosslinking the same pure nano-TiO 2 with different particle sizes, nano-TiO 2 contents and test environments of light sources, NO 2 concentrations, temperatures, humidity and illuminance [10,22,23]. All the measurements implemented the standards of HJ479-2009 regulated by the Chinese Ministry of Environmental Protection.…”

Characterization and relative photonic efficiencies of a new Fe-ACF/TiO2 composite photocatalysts designed for organic dye decomposition

“…A tremendous number of works on TiO 2 modification to improve its efficiency have been carried out in various ways, which include impurity doping [5,6], sensitization [7,8], surface modification [9], and fabrication of composites with other materials [10,11]. Activated carbon fiber (ACF), widely used as an effective adsorbent in treating polluted water and gas, has been introduced as a support for TiO 2 photocatalyst in some studies [12,13]. ACFs are one kind of highly microporous carbon materials, having a higher surface area, larger pore volume and a more uniform micropore size distribution than granular activated carbon [14][15][16][17].…”