Photocatalytic degradation of acetic acid in the presence of visible light-active TiO 2 -reduced graphene oxide photocatalysts

Morawski, Antoni W.; Kusiak-Nejman, Ewelina; Wanag, Agnieszka; Kapica-Kozar, Joanna; Wróbel, Rafał; Ohtani, Bunsho; Aksienionek, M.; Lipińska, L.

doi:10.1016/j.cattod.2016.05.055

Cited by 44 publications

(25 citation statements)

References 38 publications

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“…It was efficiently removed using TiO 2 /G nanocomposites doped with noble metals as Platinum (Pt) under UV-Vis light due to the large surface area and the decrease in the electron-hole recombination in addition to the high photonic efficiency caused by the noble metal [17]. Acetic acid photooxidation using TiO 2 /G nanocomposites under visible light irradiation was studied by Morawski [192]. The photodegradation of bisphenol A, an environmental pollutant, was evaluated using TiO 2 /G nanocomposites with uniform TiO 2 nanoparticles distribution and enhanced photocatalytic activity under UV and visible light irradiation.…”

Section: Photocatalytic Degradation Of Chemicals and Pharmaceuticalsmentioning

confidence: 99%

Titanium Dioxide/Graphene and Titanium Dioxide/Graphene Oxide Nanocomposites: Synthesis, Characterization and Photocatalytic Applications for Water Decontamination

2018

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The use of titanium dioxide, TiO2 as a photocatalyst in water decontamination has witnessed continuous interest due to its efficiency, stability, low toxicity and cost-effectiveness. TiO2 use is limited by its large band gap energy leading to light absorbance in the UV region of the spectrum, and by the relatively fast rate of recombination of photogenerated electrons and positive holes. Both limitations can be mitigated by using carbon-TiO2 nanocomposites, such as those based on graphene (G) and graphene oxide (GO). Relative to bare TiO2, these nanocomposites have improved photocatalytic activity and stability under the UV–visible light, constituting a promising way forward for improved TiO2 photocatalytic performance. This review focuses on the recent developments in the chemistry of TiO2/G and TiO2/GO nanocomposites. It addresses the mechanistic fundamentals, briefly, of TiO2 and TiO2/G and TiO2/GO photocatalysts, the various synthesis strategies for preparing TiO2/G and TiO2/GO nanocomposites, and the different characterization techniques used to study TiO2/G and TiO2/GO nanocomposites. Some applications of the use of TiO2/G and TiO2/GO nanocomposites in water decontamination are included.

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Section: Photocatalytic Degradation Of Chemicals and Pharmaceuticalsmentioning

confidence: 99%

Titanium Dioxide/Graphene and Titanium Dioxide/Graphene Oxide Nanocomposites: Synthesis, Characterization and Photocatalytic Applications for Water Decontamination

2018

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“…To enhance their solubility and improve the quality of GTiO 2 Ns composites, before mixing, TiO 2 NPs and/or graphene sheets can be functionalized by covalent C-C coupling [59,161] or non-covalent π-π stacking reactions [162]. For example, Morawski et al [163] prepared a visible light-active TiO 2 -reduced GO photocatalyst by mechanically mixing TiO 2 with an appropriate mass ratio of reduced GO in 1-butyl alcohol and successive ultrasonication. Yong Liu et al [164] prepared a graphene aqueous dispersion by sonicating a mixture of graphene raw materials with polyvinylpyrrolidone (PVP) as surfactant and a suspension of TiO 2 by dispersing TiO 2 powder in deionized water with ultrasonication.…”

Section: Preparation Methods Of Gtio 2 Nsmentioning

confidence: 99%

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

et al. 2017

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Synthetic dyes are widely used in textile, paper, food, cosmetic, and pharmaceutical industries. During industrial processes, some of these dyes are released into the wastewater and their successive release into rivers and lakes produces serious environmental problems. TiO 2 is one of the most widely studied and used photocatalysts for environmental remediation. However, it is mainly active under UV-light irradiation due to its band gap of 3.2 eV, while it shows low efficiency under the visible light spectrum. Regarding the exploration of TiO 2 activation in the visible light region of the total solar spectrum, the incorporation of carbon nanomaterials, such as graphene, in order to form carbon-TiO 2 composites is a promising area. Graphene, in fact, has a large surface area which makes it a good adsorbent for organic pollutants removal through the combination of electrostatic attraction and π-π interaction. Furthermore, it has a high electron mobility and therefore it reduces the electron-hole pair recombination, improving the photocatalytic activity of the semiconductor. In recent years, there was an increasing interest in the preparation of graphene-based TiO 2 photocatalysts. The present short review describes the recent advances in TiO 2 photocatalyst coupling with graphene materials with the aim of extending the light absorption of TiO 2 from UV wavelengths into the visible region, focusing on recent progress in the design and applications in the photocatalytic degradation of synthetic dyes.

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“…Before modification the crude TiO 2 has been pre-treated as described in our previous work [ 27 ]. Graphene materials (graphene oxide GO and reduced graphene oxide rGO) synthesized by modified Hummer’s method, were supplied by Institute of Electronic Materials Technology (Warsaw, Poland) [ 28 ]. Firstly, the appropriate amount of GO was prepared.…”

Section: Methodsmentioning

confidence: 99%

Assessment of the Suitability of the One-Step Hydrothermal Method for Preparation of Non-Covalently/Covalently-Bonded TiO2/Graphene-Based Hybrids

Kusiak-Nejman¹,

Moszyński²,

Kapica-Kozar³

et al. 2018

Nanomaterials

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A hybrid nanocomposites containing nanocrystalline TiO2 and graphene-related materials (graphene oxide or reduced graphene oxide) were successfully prepared by mechanical mixing and the hydrothermal method in the high-pressure atmosphere. The presented X-ray photoelectron spectroscopy (XPS) study and quantitative elemental analysis confirm similar content of carbon in graphene oxide GO (52 wt% and 46 wt%, respectively) and reduced graphene oxide rGO (92 wt% and 98 wt%, respectively). No chemical interactions between TiO2 and GO/rGO was found. TiO2 nanoparticles were loaded on GO or rGO flakes. However, Fourier transform infrared-diffuse reflection spectroscopy (FTIR/DRS) allowed finding peaks characteristic of GO and rGO. XPS study shows that since the concentration of TiO2 in the samples was no less than 95 wt%, it was assumed that the interactions between TiO2 and graphene should not influence the lower layers of titanium atoms in the TiO2 and they occurred as Ti4+ ions. Hydrothermal treatment at 200 °C did not cause the reduction of GO to rGO in TiO2-GO nanocomposites. In general, the one-step hydrothermal method must be considered to be inefficient for preparation of chemically-bonded composites synthesized from commercially available TiO2 and unfunctionalized graphene sheets obtained from graphite powder.

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Photocatalytic degradation of acetic acid in the presence of visible light-active TiO 2 -reduced graphene oxide photocatalysts

Cited by 44 publications

References 38 publications

Titanium Dioxide/Graphene and Titanium Dioxide/Graphene Oxide Nanocomposites: Synthesis, Characterization and Photocatalytic Applications for Water Decontamination

Titanium Dioxide/Graphene and Titanium Dioxide/Graphene Oxide Nanocomposites: Synthesis, Characterization and Photocatalytic Applications for Water Decontamination

Recent Advances in Graphene Based TiO2 Nanocomposites (GTiO2Ns) for Photocatalytic Degradation of Synthetic Dyes

Assessment of the Suitability of the One-Step Hydrothermal Method for Preparation of Non-Covalently/Covalently-Bonded TiO2/Graphene-Based Hybrids

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