Degradation of methylene blue as a pollutant with N-doped graphene quantum dot/titanium dioxide nanocomposite

Safardoust-Hojaghan, Hossein; Salavati‐Niasari, Masoud

doi:10.1016/j.jclepro.2017.01.169

Cited by 239 publications

(51 citation statements)

References 30 publications

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“…N-doped GQDs/TiO 2 nanocomposites were prepared hydrothermally using ethylenediamine and citric acid as N and C precursors. The prepared N-doped GQDs/TiO 2 nanocomposites showed excellent photocatalytic activity in the photocatalytic degradation of MB dye under UV light illumination [113]. N,S co-doped GQDs/G/TiO 2 nanocomposites were prepared by alkaline HT process and improved the photocatalytic degradation of methyl orange dye under visible light illumination [114].…”

Section: The Hydrothermal (Ht) Methodsmentioning

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: The Hydrothermal (Ht) Methodsmentioning

confidence: 99%

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

2018

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“…Pt nanoparticles also own the capability of uric acid enzyme . These nanoparticles, playing the role of natural enzymes, have been widely used in the fields of immunoassay, determination of metal ions, target sensor, degradation of pollutants, hybridization of nucleic acids and organic synthesis …”

Section: Introductionmentioning

confidence: 99%

Synthesis of CeO₂ nanoparticles with different morphologies and their properties as peroxidase mimic

Zhang

Wang

et al. 2018

J Am Ceram Soc

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The overall objective of this work was to identify and determine the controlling factors of catalytic activity of CeO2 nanoparticles with different properties. Therefore, four kinds of CeO2 nanoparticles are successfully synthesized and used as peroxidase mimics. The results reveal that the catalytic activity is related to specific surface area and surface oxygen (Osur) content. For different CeO2 nanoparticles, specific surface area is the leading factor of catalytic activity. The catalytic activity increases with the increasing specific surface area. If the CeO2 nanoparticles have similar specific surface area, the less Osur contains, the lower catalytic activity will be. Meanwhile, crystallinity is not the influence factor of catalytic activity. Bamboo‐like CeO2 (B‐CeO2) nanoparticles show excellent catalytic activity and the reaction conditions are optimized. Furthermore, the catalytic activity of B‐CeO2 nanoparticles decreases very slightly after 15 cycles of the catalysis experiment. Therefore, B‐CeO2 nanoparticles can serve as effective recyclable peroxidase mimics.

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“…On the contrary, the TiO 2 -intercalated GOs exhibited much higher photocatalytic degradation efficiency than other catalysts (TiO 2 -intercalated GOs > TiO 2 -adsorbed GOs > GOs > -TiO 2 ). They could degrade nearly 99.9% of MB within 18 min under the UV light which was much faster than reported literature [25,33,[50][51][52][53]. Because of in situ growth of TiO 2 nanocrystals by adhering to GO surfaces and/or GO-GO interfaces, the contact resistance between TiO 2 and GOs was significantly reduced.…”

Section: Photocatalytic Degradation Of Mbmentioning

confidence: 69%

TiO₂-Intercalated Graphene Oxides with Highly Efficient Photocatalytic Degradation for Methylene Blue

Yao

et al. 2018

Journal of Nanomaterials

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The low photocatalytic decomposition activity of TiO 2 toward industrial pollutants at room temperature is one of the main obstacles for its practical application. TiO 2 -intercalated graphene oxide (GO) composites were prepared by in situ hydrolysis of butyl titanate in a GO aqueous solution, followed by hydrothermal reaction to improve their photoelectron separation efficiency. The in situ generated TiO 2 nanocrystals could grow and adhere to the GO walls, thereby greatly improving the contact area and binding strength among them and resulting in low photoelectron transfer resistance. The photocatalytic activities of the as-prepared catalyst were evaluated via photodegradation of methylene blue (MB). The TiO 2 -intercalated GOs displayed much higher catalytic activity than GO, TiO 2 , and TiO 2 -adsorbed GOs. The degradation efficiency of MB by TiO 2 -intercalated GOs increased with increasing bath ratio of TiO 2 -intercalated GOs to MB solution, but it decreased with increasing initial concentration of MB. Degradation of MB by UV light was much faster than by simulated sunlight. The degradation time by sunlight was only 5% of degradation time by UV light. Cyclic catalytic experiments indicated that TiO 2 -intercalated GO maintained 99.97% degradation activity after repeated degradation (five times), thereby indicating the good decomposition durability.

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Degradation of methylene blue as a pollutant with N-doped graphene quantum dot/titanium dioxide nanocomposite

Cited by 239 publications

References 30 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

Synthesis of CeO₂ nanoparticles with different morphologies and their properties as peroxidase mimic

TiO₂-Intercalated Graphene Oxides with Highly Efficient Photocatalytic Degradation for Methylene Blue

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Degradation of methylene blue as a pollutant with N-doped graphene quantum dot/titanium dioxide nanocomposite

Cited by 239 publications

References 30 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

Synthesis of CeO2 nanoparticles with different morphologies and their properties as peroxidase mimic

TiO2-Intercalated Graphene Oxides with Highly Efficient Photocatalytic Degradation for Methylene Blue

Contact Info

Product

Resources

About

Synthesis of CeO₂ nanoparticles with different morphologies and their properties as peroxidase mimic

TiO₂-Intercalated Graphene Oxides with Highly Efficient Photocatalytic Degradation for Methylene Blue