Investigation of amino-grafted TiO2/reduced graphene oxide hybrids as a novel photocatalyst used for decomposition of selected organic dyes

Siwińska-Stefańska, Katarzyna; Fluder, Monika; Tylus, Włodzimierz; Jesionowski, Teofil

doi:10.1016/j.jenvman.2018.02.030

Cited by 32 publications

(5 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The corresponding elimination mechanism led to the formation of the following products: carbon dioxide CO 2 , water H 2 O, nitric acid HNO 3 and chlorine 19 gas Cl 2 . Another mechanism has been proposed by Siwinska-Stefańska et al Demonstrates that basic blue 9 and basic red 1 dyes elimination in presence of the two radicals O and • OH results the formation of the following compounds: Carbon dioxide CO 2 and water H 2 O for the first radical, the same products were obtained with the second radical but with other products in addition 20 . Hassani et al conducted a similar study on the removal of basic violet (BV10) at an optimal acid pH.…”

Section: Introductionmentioning

confidence: 91%

Dissociation of Basic Dyes by Advanced Oxidation: Theoretical Study by DFT Calculations

2019

Chem Sci Trans

View full text Add to dashboard Cite

This work is based on a theoretical study concerning the degradation of basic dyes by advanced oxidation on five basic molecules called as follows: basic red 2 (BR2), basic red 5 (BR5), basic red (BR10), basic violet 5 (BV5) and basic violet 12 (BV12). The purpose of this work is to determine the attack sites most reactive to radical attacks. In other words, the location of the sites which favors the degradation by using the advanced oxidation process. This process is essential in the field of the water depollution. The work was done theoretically by ab initio methods. The calculations were carried out by CAM-B3LYP functional and 6-31++G(d, p) basis set. The exploitation of the results gives the following parameters: local indices of reactivities to radical attacks, global indices of reactivities and transition states. The results obtained from these parameters show the most reactive sites to radical attacks that are in good agreement with the sites determined experimentally. Hence, the majority of the sites were located at the level of the phenazine chromophore constituting the five dyes.

show abstract

Section: Introductionmentioning

confidence: 91%

Dissociation of Basic Dyes by Advanced Oxidation: Theoretical Study by DFT Calculations

2019

Chem Sci Trans

View full text Add to dashboard Cite

show abstract

“…Despite these characteristics, GQDs are not efficient in delivering some of the key characteristics required for catalysis, such as possessing a wide bandgap; having the ability to maintain high electron-hole pair separation and transfer efficiency; exceptional heat transfer and electron transport properties (as in TiO 2 and ZnO semiconductors); and having the capability to donate metal ions (as in Ag+) for biocidal applications [27,28]. Hence, the homogeneous combination of at least two dissimilar nanomaterials, such as TiO 2 and graphene-based materials, with diverse properties and complementary functionalities, holds great promise for addressing the growing needs of energy and biomedical applications [29][30][31][32]. Such materials, which are formed by the mixture of two or more components (non-gaseous), in which at least one of them has a nanoscale structure, are called nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

TiO2-Graphene Quantum Dots Nanocomposites for Photocatalysis in Energy and Biomedical Applications

2021

View full text Add to dashboard Cite

The focus of current research in material science has shifted from “less efficient” single-component nanomaterials to the superior-performance, next-generation, multifunctional nanocomposites. TiO2 is a widely used benchmark photocatalyst with unique physicochemical properties. However, the large bandgap and massive recombination of photogenerated charge carriers limit its overall photocatalytic efficiency. When TiO2 nanoparticles are modified with graphene quantum dots (GQDs), some significant improvements can be achieved in terms of (i) broadening the light absorption wavelengths, (ii) design of active reaction sites, and (iii) control of the electron-hole (e−-h+) recombination. Accordingly, TiO2-GQDs nanocomposites exhibit promising multifunctionalities in a wide range of fields including, but not limited to, energy, biomedical aids, electronics, and flexible wearable sensors. This review presents some important aspects of TiO2-GQDs nanocomposites as photocatalysts in energy and biomedical applications. These include: (1) structural formulations and synthesis methods of TiO2-GQDs nanocomposites; (2) discourse about the mechanism behind the overall higher photoactivities of these nanocomposites; (3) various characterization techniques which can be used to judge the photocatalytic performance of these nanocomposites, and (4) the application of these nanocomposites in biomedical and energy conversion devices. Although some objectives have been achieved, new challenges still exist and hinder the widespread application of these nanocomposites. These challenges are briefly discussed in the Future Scope section of this review.

show abstract

“…Therefore, many methods have been used to enhance the carrier transfer [11][12][13][14]. For example, loading co-catalysts or coupling with other semiconductors can enhance the separation of photo-induced electron-holes [15,16]. Whereas, the inherent conductivity of the polymer photocatalyst is still not high enough.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient visible-light-induced photoactivity of carbonized polyimide aerogel for antibiotic degradation

Zhao

Wang

et al. 2020

Nanotechnology

View full text Add to dashboard Cite

Various nitrogen (N)-doped carbon materials have been designed as efficient photocatalysts. For the first time, polyimide (PI) aerogels were calcined to be N-doped carbon photocatalysts at different temperatures. The structures of the carbonized polyimide aerogels (CPIs) vary with the carbonization temperature. The conductivity of the CPI increases with the improvement of calcination temperature, whereas the N content of the CPI decreases and the N state also changes. Thus, the electronic properties of the CPI are changed. The photocatalytic experiments certified that the PI aerogel calcined at 800 °C exhibited the highest photocatalytic performance. The chlortetracycline (CTC) degradation rate over CPI-800 aerogel is 2.3 times as much as that of PI aerogel due to the changed structure and properties of the CPI-800 aerogel.

show abstract

Investigation of amino-grafted TiO2/reduced graphene oxide hybrids as a novel photocatalyst used for decomposition of selected organic dyes

Cited by 32 publications

References 57 publications

Dissociation of Basic Dyes by Advanced Oxidation: Theoretical Study by DFT Calculations

Dissociation of Basic Dyes by Advanced Oxidation: Theoretical Study by DFT Calculations

TiO2-Graphene Quantum Dots Nanocomposites for Photocatalysis in Energy and Biomedical Applications

Highly efficient visible-light-induced photoactivity of carbonized polyimide aerogel for antibiotic degradation

Contact Info

Product

Resources

About