Abstract
Poriferous TiO2/GO (denoted as TGO-x%) photocatalysts with ultrathin grapheme oxide (GO) layer were prepared by a hydrothermal method, the adsorption and photocatalytic degradation and its kinetics about Methylene blue(MB) were studied systematically. All the TGO-x% showed improved adsorption and photodegradation performance. TGO-25% had excellent adsorptivity while TGO-20% exhibit the highest visible light photocatalytic degradation activity. The adsorption capacity for TGO-25% was 20.25 mg/gcatalyst along with the k1 was about 0.03393 min·gcatalyst/mg, this enhancement was mainly owing to the strong adsorption capacity of GO and the stacking structure of sheets and nanoparticles. GO sheets prevented the agglomeration of TiO2 particles and TiO2 nanoparticles also prevented the agglomeration of GO sheets, which could provides greater surface area. Besides, the remarkably superior photodegradation activity of TiO2/GO composites is mainly attribute to the strong absorption of visible light and the effective charge separation revealed by the photoluminescence, the total removal rate of MB is 97.5% after 35 min adsorption and 140 min degradation, which is 3.5 times higher than that of TiO2.
Highlights
Poriferous TiO2/GO photocatalysts with ultrathin grapheme oxide (GO) layer were prepared by a hydrothermal method, the adsorption and photocatalytic degradation and its kinetics about Methylene blue(MB) were studied systematically
TiO2 composites using a one‐step hydrothermal method, the percentage of GO in the composites were optimized based on the composite’s performance in the photocatalytic degradation of methylene blue (MB), and the adsorption/photocatalytic activity and kinetics have been discussed in detail
TEM images as seen in Fig. 1(d) displayed the graphene oxide layers intercalated or embedded with ca.[20] nm TiO2 particles in the TGO-20% sample, in which the graphene oxide consisted of quite a few layers
Summary
Poriferous TiO2/GO (denoted as TGO-x%) photocatalysts with ultrathin grapheme oxide (GO) layer were prepared by a hydrothermal method, the adsorption and photocatalytic degradation and its kinetics about Methylene blue(MB) were studied systematically. The GO/TiO2 composites possess large specific surface area and effective charge carrier separation ability, which greatly improved the adsorption capacity for organic pollutants. This study provides an effective method for the construction of TiO2 based composite with efficient photocatalytic mineralization ability and facilitates their potential application for water purification.
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