Concurrent synthesis of nitrogen-doped carbon dots for cell imaging and ZnO@nitrogen-doped carbon sheets for photocatalytic degradation of methylene blue

Atchudan, Raji; Edison, Thomas Nesakumar Jebakumar Immanuel; Perumal, Suguna; Karthik, Namachivayam; Karthikeyan, D.; Manivannan, Shanmugam; Lee, Yong Rok

doi:10.1016/j.jphotochem.2017.09.038

Cited by 129 publications

(43 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Considering the excellent photocatalytic efficiency toward the degradation of RhB and MB, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, C-dots prepared in this work are shown to be a very promising alternative for dye degradation and environment cleanliness ( Table 1, As such, our C-dots exhibited excellent photocatalytic activity compared to most of the bare C-dots previously reported ( Table 1). Most of the C-dots previously synthesized have shown little photocatalytic activity toward dye degradation ( Table 1, entries 1-4) [48][49][50][51][52]; in order to catalyze the degradation of organic dyes efficiently, they have to composite with metal-based nanoparticles ( Table 1, entries 2-4) [50][51][52][53][54][55][56][57], which not only significantly complicated the preparation procedures and reduced yields, but also increased cost and environmental concerns. For example, Yu et al reported C-dots/TNS and C-dots/P25 composites with excellent photocatalytic activity for the degradation of RhB; however, there was no activity when C-dots were used alone [52].…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, C-dos alone have shown little activity toward the photocatalytic degradation of organic dyes [47][48][49][50][51][52]. To realize the efficient degradation of organic dyes, C-dots have to be integrated in metal-based heterostructures [50][51][52][53][54][55][56][57]. Recently, some encouraging reports demonstrated the efficient photocatalytic degradation of organic dyes by C-dots alone [58][59][60][61][62][63][64]; however, various factors including limited light absorption, extra surface doping, and tedious separation significantly limited their practical applications.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

View full text Add to dashboard Cite

Carbon dots (C-dots) were facilely fabricated via a hydrothermal method and fully characterized. Our study shows that the as-synthesized C-dots are nontoxic, negatively charged spherical particles (average diameter 4.7 nm) with excellent water dispersion ability. Furthermore, the C-dots have a rich presence of surface functionalities such as hydroxyls and carboxyls as well as amines. The significance of the C-dots as highly efficient photocatalysts for rhodamine B (RhB) and methylene blue (MB) degradation was explored. The C-dots demonstrate excellent photocatalytic activity, achieving 100% of RhB and MB degradation within 170 min. The degradation rate constants for RhB and MB were 1.8 × 10−2 and 2.4 × 10−2 min−1, respectively. The photocatalytic degradation performances of the C-dots are comparable to those metal-based photocatalysts and generally better than previously reported C-dots photocatalysts. Collectively considering the excellent photocatalytic activity toward organic dye degradation, as well as the fact that they are facilely synthesized with no need of further doping, compositing, and tedious purification and separation, the C-dots fabricated in this work are demonstrated to be a promising alternative for pollutant degradation and environment protection.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Peng

Zhou

et al. 2020

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…In solvothermal approaches, chemical and physical properties such as dielectric constant, density, polarity, and the interactivity of additives and reactants become especially important in selecting precursors. The hydrothermal or solvothermal synthesis of ZnO-GO or ZnO-rGO is based on incorporating ZnO into graphene-based nanomaterials [54][55][56][57][58].…”

Section: Hydrothermal and Solvothermal Methodsmentioning

confidence: 99%

Advances and Challenges in Developing Efficient Graphene Oxide-Based ZnO Photocatalysts for Dye Photo-Oxidation

et al. 2020

View full text Add to dashboard Cite

The efficient remediation of organic dyes from wastewater is increasingly valuable in water treatment technology, largely owing to the tons of hazardous chemicals currently and constantly released into rivers and seas from various industries, including the paper, pharmaceutical, textile, and dye production industries. Using solar energy as an inexhaustible source, photocatalysis ranks among the most promising wastewater treatment techniques for eliminating persistent organic pollutants and new emerging contaminants. In that context, developing efficient photocatalysts using sunlight irradiation and effectively integrating them into reactors, however, pose major challenges in the technologically relevant application of photocatalysts. As a potential solution, graphene oxide (GO)-based zinc oxide (ZnO) nanocomposites may be used together with different components (i.e., ZnO and GO-based materials) to overcome the drawbacks of ZnO photocatalysts. Indeed, mounting evidence suggests that using GO-based ZnO nanocomposites can promote light absorption, charge separation, charge transportation, and photo-oxidation of dyes. Despite such advances, viable, low-cost GO-based ZnO nanocomposite photocatalysts with sufficient efficiency, stability, and photostability remain to be developed, especially ones that can be integrated into photocatalytic reactors. This article offers a concise overview of state-of-the-art GO-based ZnO nanocomposites and the principal challenges in developing them.

show abstract

“…Finally, modifications of ZnO photocatalyst with carbon quantum dots (CQDs) have been mostly considered due to low toxicity, aqueous stability, enhanced surface area, economic feasibility, good biocompatibility, and chemical inertness of CQDs [161,172]. Many strategies have been developed to enhance the photocatalytic activity of conventional ZnO via coupling with CQDs, by principally following green and bio-sustainable chemical approaches [195][196][197][198][199]. Therefore, the unique properties of carbon-based/ZnO nanocomposites were used for charge separation, as they reduce the e − /h + pair recombination [200].…”

Section: Carbon-based/zno Hybridsmentioning

confidence: 99%

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

2020

View full text Add to dashboard Cite

Solar radiation is becoming increasingly appreciated because of its influence on living matter and the feasibility of its application for a variety of purposes. It is an available and everlasting natural source of energy, rapidly gaining ground as a supplement and alternative to the nonrenewable energy feedstock. Actually, an increasing interest is involved in the development of efficient materials as the core of photocatalytic and photothermal processes, allowing solar energy harvesting and conversion for many technological applications, including hydrogen production, CO2 reduction, pollutants degradation, as well as organic syntheses. Particularly, photosensitive nanostructured hybrid materials synthesized coupling inorganic semiconductors with organic compounds, and polymers or carbon-based materials are attracting ever-growing research attention since their peculiar properties overcome several limitations of photocatalytic semiconductors through different approaches, including dye or charge transfer complex sensitization and heterostructures formation. The aim of this review was to describe the most promising recent advances in the field of hybrid nanostructured materials for sunlight capture and solar energy exploitation by photocatalytic processes. Beside diverse materials based on metal oxide semiconductors, emerging photoactive systems, such as metal-organic frameworks (MOFs) and hybrid perovskites, were discussed. Finally, future research opportunities and challenges associated with the design and development of highly efficient and cost-effective photosensitive nanomaterials for technological claims were outlined.

show abstract

Concurrent synthesis of nitrogen-doped carbon dots for cell imaging and ZnO@nitrogen-doped carbon sheets for photocatalytic degradation of methylene blue

Cited by 129 publications

References 54 publications

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Facile Synthesis of “Boron-Doped” Carbon Dots and Their Application in Visible-Light-Driven Photocatalytic Degradation of Organic Dyes

Advances and Challenges in Developing Efficient Graphene Oxide-Based ZnO Photocatalysts for Dye Photo-Oxidation

Photosensitive Hybrid Nanostructured Materials: The Big Challenges for Sunlight Capture

Contact Info

Product

Resources

About