NDLI: Preparation of TiO$_{2}$-Graphene Composite by a Two-Step Solvothermal Method and its Adsorption-Photocatalysis Property

Content Provider	Springer Nature Link
Author	Liu, Xiao wen Shen, Ling yan Hu, Yue hua
Copyright Year	2016
Abstract	TiO$_{2}$-graphene (TiO$_{2}$-GR) composites were successfully prepared by a two-step solvothermal method using titanium dioxide and natural graphite powder. X-ray diffraction (XRD) patterns showed that graphene oxide (GO) was prepared from natural flake graphite by a modified hydrothermal pressurized oxidation method. The results of Fourier transform infrared spectroscopy (FTIR) proved that TiO$_{2}$-GR composites were synthesized during the process of hydrothermal reaction while GO was changed into graphene. X-ray photoelectron spectroscopy (XPS) demonstrated that TiO$_{2}$ particles contacted closely with graphene via Ti–O–C bonds. The results of Raman spectra confirmed the existence of graphene in the TiO$_{2}$-GR composite. Scanning electron microscopy (SEM) images showed that TiO$_{2}$ particles were oval and grafted on the graphene sheet which was smooth with ripples. UV-visible diffuse reflectance spectra demonstrated that there was a red shift in the absorption edge of TiO$_{2}$-GR composite. The experimental results indicated that the TiO$_{2}$-GR composite had significantly adsorption-photocatalytic activity for the degradation of methylene blue (MB) dyes. The adsorption capacity (q $_{max}$) of TiO$_{2}$-6%GR-4h for MB was 41.32 mg ⋅ g$^{− 1}$ calculated based on the Langmuir adsorption model, which was about 3.3 times the adsorption capacity of TiO$_{2}$. Adsorption kinetics studies showed that the adsorption process fit well with the pseudo-second-order model. It proved that the TiO$_{2}$-GR composites were more efficient than the pure TiO$_{2}$ in the field of environmental protection.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	227
Issue Number	5
e-ISSN	15732932
Language	English
Publisher	Springer International Publishing
Publisher Date	2016-04-15
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	TiO$_{2}$-graphene composite Graphene oxide Natural graphite Adsorption-photocatalysis property Methylene blue Environment Water Quality/Water Pollution Atmospheric Protection/Air Quality Control/Air Pollution Soil Science & Conservation Hydrogeology Climate Change/Climate Change Impacts
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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