Synthesis and degradation kinetics of TiO2/GO composites with highly efficient activity for adsorption and photocatalytic degradation of MB

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.

A short review of titania-graphene oxide based composites as a photocatalysts

“…Using XRD patterns, Min et al [50] also showed that all the peaks for the TiO 2 /GO composites were Using XRD patterns, Min et al [50] also showed that all the peaks for the TiO 2 /GO composites were indexed to the anatase phase of TiO2, without peaks of layered GO and these results demonstrate that the GO was considerably reduced to graphene sheet during the solvothermal reaction. characteristic of graphene begins to appear, which can be explained by possible partial reduction of GO.…”

Surface engineering of nanoparticles for highly efficient UV‐shielding composites

“…Recently, the nanohybrids consisting of two geometrically dissimilar nanofillers will give a full play to the advantages of each nanofillers and exhibit promising synergistic effect, which can exert a more positive influence on the properties of polymers 50,51 . Typically, the nanomaterials with large surface area, such as halloysite nanotubes, carbon nanotubes, grapheme nanosheets and mesoporous silica, were often used as the nanocarriers to immobilize other functional Nps 52‐54 . In the field of UV‐shielding polymer composites, some significant researches also developed the UV‐shielding nanohybrids consisting of anti‐UV Nps and nanocarriers.…”

Atmospheric plasma dielectric barrier discharge: A simple route to produce superhydrophilic TiO2@carbon nanostructure

“…Figures 9a and 9b show the deconvolution of the C (1s) peak for the reference sample (bare TiO 2 powder; Figure 9a) and for the as-deposited TiO 2 @C nanocomposite deposited at 8 kV (Figure 9b). The C (1s) peak of the TiO 2 NPs powder is fitted with only one component at 285 eV, corresponding to adventitious carbon contaminants [34] (C-C and/or C-H), whereas four components at 285, 286.7, 288.3, and 289.1 eV were utilized to fit the C (1s) peak obtained from the TiO 2 @C deposited at 8 kV. The first peak at 285 eV is due to the graphitic carbon bonds (alkyl) C-C and/or C-H formed at the surface of the nanocomposites, whereas the three others correspond to C-O, C═O and/or O-C-O and/ or O-C═O/COOH bonds of the carbonate-like species due to the oxidation of carbon species, [28,35] as they are also found in C-TiO 2 prepared by wet chemical reactions using different carbon precursors by Kim et al [36] The highest C (1s) energy peaks at 288.3 and 289.1 eV are also identified in TiO 2 @C prepared by wet chemical methods and different molecular carbon precursors.…”