Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation

Samanta, Soumadri; Kumar, Sunil; Battula, Venugopala Rao; Jaryal, Arpna; Sardana, Neha; Kailasam, Kamalakannan

doi:10.1039/d0ra03773g

Cited by 13 publications

(12 citation statements)

References 52 publications

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“…A lower PL intensity of Ox@CNB was observed as compared with that of BCN, highlighting the obstruction of charge recombination in Ox@CNB. These results indicated that O doping, the terminal −NH 2 group and the porous hollow tubular structure promote the charge‐transfer process in Ox@CNB, restricting charge recombination [66–68] . Interestingly, a red‐shift of the emission peak was observed between the Ox@CNB and BCN spectra.…”

Section: Resultsmentioning

confidence: 85%

“…These results indicated that O doping, the terminal À NH 2 group and the porous hollow tubular structure promote the charge-transfer process in Ox@CNB, restricting charge recombination. [66][67][68] Interestingly, a red-shift of the emission peak was observed between the Ox@CNB and BCN spectra. The decreased intensity of the emission peak is attributable to the narrow bandgap of Ox@CNB, which is consistent with the results of UV-vis DRS.…”

Section: Chemcatchemmentioning

confidence: 99%

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Photocatalytic Biorefinery to Lactic Acid: A Carbon Nitride Framework with O Atoms Replacing the Graphitic N Linkers Shows Fast Migration/Separation of Charge

Yang

Yao

et al. 2022

ChemCatChem

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The rational regulation of the structure of photocatalysts with an enhanced visible-light absorption property and rapid charge dynamics is promising and challenging. Here, a facile method was developed for preparing oxygen-doped carbon nitride bundles with porous hollow trunk-shaped structures (Ox@CNB) using melamine with assistance of hydrochloric acid. Experimental results and density functional theory (DFT) calculations indicated that Ox@CNB exhibited controllable bandgaps (2.20-2.60 eV) and a low photoluminescence intensity. Interestingly, Ox@CNB displayed excellent photocatalytic activity for the synthesis of lactic acid (81.4 %) and universality for the reforming of biomass-derived monosaccharides to lactic acid. The oxidation active species of h + , * OH, * O 2 À and 1 O 2 all promoted the lactic acid production, and h + played a major role. A possible reaction mechanism of lactic acid synthesis was proposed by combining the experimental with the DFT results. A one-thousand-fold up-scaled experiment demonstrated the significant application potential of the system for the industrial production of lactic acid.

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Section: Resultsmentioning

confidence: 85%

Section: Chemcatchemmentioning

confidence: 99%

Photocatalytic Biorefinery to Lactic Acid: A Carbon Nitride Framework with O Atoms Replacing the Graphitic N Linkers Shows Fast Migration/Separation of Charge

Yang

Yao

et al. 2022

ChemCatChem

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“…However, it is formed at quite high temperatures (450 to 550 °C), and therefore it is only partially characterized, besides the fact that the authors prove that the polymer consists of heptazine units linked by oxygen bridges. In a very recent article, the same authors described a nanocomposite made of highly porous OLHP, coated by S- and N-doped graphene nanoparticles . They show that due to the composite material, both because of the high porosity and the complementarity of the partners (the gC dots acting as electron reservoirs), the hydrogen evolution is considerably enhanced compared to OLHP, ultimately reaching values of 23.9 mmol g –1 h –1 .…”

Section: Supramolecular Chemistry Of S-heptazines: Liquid Crystals An...mentioning

confidence: 99%

“…In a very recent article, the same authors described a nanocomposite made of highly porous OLHP, coated by S-and N-doped graphene nanoparticles. 132 They show that due to the composite material, both because of the high porosity and the complementarity of the partners (the gC dots acting as electron reservoirs), the hydrogen evolution is considerably enhanced compared to OLHP, ultimately reaching values of 23.9 mmol g −1 h −1 . Another promising approach to insert reactive heptazine rings inside a material is the MOF synthesis.…”

Section: Heptazine-based Cofsmentioning

confidence: 99%

State of the Art in the Preparation and Properties of Molecular Monomeric s-Heptazines: Syntheses, Characteristics, and Functional Applications

et al. 2021

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This review gives an account on the fast expanding field of monomeric (or molecular) heptazines, at the exclusion of their various polymeric forms, often referred to as carbon nitrides. While examples of monomeric heptazines were extremely limited until the beginning of this century, the field has started expanding quickly since then, as has the number of reports on polymeric materials, though previous reviews did not separate these fields. We provide here a detailed report on the synthetic procedures for molecular heptazines. We also extensively report on the different achievements realized from these new molecules, in the fields of physical chemistry, spectroscopy, materials preparation, (photo)catalysis, and devices. After a comprehensive summary and discussion on heptazines syntheses and characteristics, we show that starting from well-defined molecules allows a versatility of approaches and a wide tunability of the expected properties. It comes out that the field of monomeric heptazines is now emerging and possibly heading toward maturity, while diverging from the one of polymeric carbon nitrides. It is likely that this area of research will quickly surge to the forefront of the search for active organic molecules, with special attention to the domains of catalysis and organic-based functional materials and devices.

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“…Although visible light is harmless, the strategy is still appropriate to cure only superficial lumps. 88 , 89 Various research invitations have revealed that QD-conjugated oligonucleotide sequences (attached through surface COOH groups) are targeted to connect with DNA or mRNA. 90 , 91 Bio conjugated QDs are also considered for the site-specific gene as well as drug delivery in cancer.…”

Section: Various Types Of Nanocarrier-based Drug Delivery Systemsmentioning

confidence: 99%

Nanocarriers-Mediated Drug Delivery Systems for Anticancer Agents: An Overview and Perspectives

Edis¹,

Wang²,

Waqas³

et al. 2021

IJN

220

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Nanotechnology has been actively integrated as drug carriers over the last few years to treat various cancers. The main hurdle in the clinical management of cancer is the development of multidrug resistance against chemotherapeutic agents. To overcome the limitations of chemotherapy, the researchers have been developing technological advances for significant progress in the oncotherapy by enabling the delivery of chemotherapeutic agents at increased drug content levels to the targeted spots. Several nano-drug delivery systems designed for tumor-targeting are evaluated in preclinical and clinical trials and showed promising outcomes in cancerous tumors’ clinical management. This review describes nanocarrier’s importance in managing different types of cancers and emphasizing nanocarriers for drug delivery and cancer nanotherapeutics. It also highlights the recent advances in nanocarriers-based delivery systems, including polymeric nanocarriers, micelles, nanotubes, dendrimers, magnetic nanoparticles, solid lipid nanoparticles, and quantum dots (QDs). The nanocarrier-based composites are discussed in terms of their structure, characteristics, and therapeutic applications in oncology. To conclude, the challenges and future exploration opportunities of nanocarriers in chemotherapeutics are also presented.

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Quantum dot-sensitized O-linked heptazine polymer photocatalyst for the metal-free visible light hydrogen generation

Abstract: A polymeric O-linked heptazine polymer (OLHP) decorated with S, N co-doped graphene quantum dots (S,N-GQDs) as a photosensitizer to utilize visible light (λ > 420 nm) for hydrogen generation.

Cited by 13 publications

References 52 publications

Photocatalytic Biorefinery to Lactic Acid: A Carbon Nitride Framework with O Atoms Replacing the Graphitic N Linkers Shows Fast Migration/Separation of Charge

Photocatalytic Biorefinery to Lactic Acid: A Carbon Nitride Framework with O Atoms Replacing the Graphitic N Linkers Shows Fast Migration/Separation of Charge

State of the Art in the Preparation and Properties of Molecular Monomeric s-Heptazines: Syntheses, Characteristics, and Functional Applications

Nanocarriers-Mediated Drug Delivery Systems for Anticancer Agents: An Overview and Perspectives

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