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Achieving nitrogen fixation in visible light-driven using metal-free and eco-friendly semiconductors at acceptable temperature and pressure still remains a big challenge. In the field of artificial photosynthesis, reported semiconductors for nitrogen fixation have large band gap around 3.0 eV and requires high temperature and pressure which results the catalytic nitrogen fixation is navigate under visible light, consume supply of global energy, and emit global greenhouse gas. In conflict this report illustrates a metal free catalyst EBCNDG with a band gap of ∼2.64 eV at room temperature and pressure indicate photocatalytic campaign toward nitrogen fixation in visible light without producing any harmful gases. The EBCNDG photocatalyst has a vacancy of high active oxygen which helps adsorb and stabilize the intermediate and increases the rate of nitrogen fixation. The EBCNDG photocatalyst was prepared by coupling of an eosin B (EB) with N-doped graphene (NDG) via amide linkage. This unique combination opens a new trial for nitrogen fixation as well as NADH regeneration under acceptable conditions using visible energy. The amount of ammonia obtained by EBCNDG is 0.513 mM and the regeneration yield of NADH is 90.3%. [ABSTRACT FROM AUTHOR]

A schematic strategy is presented to overcome the problem of low photocatalytic performance of graphene. Herein, we synthesized nitrogen-doped graphene (NDG)-coupled acid fuchsin (AF) photocatalyst, i.e.; NDGCAF photocatalyst. The NDGCAF photocatalyst has excellent solar light harvesting ability, band gap suitability, and high molar extinction coefficient than the NDG photocatalyst. Due to these properties, the NDGCAF photocatalyst has the ability to oxidize aryl-vinyl into aryl-vinyl-aldehyde under the irradiation of visible light. In this context, it exhibited the utmost conversion efficiency of aryl-vinyl to aryl-vinyl-aldehyde with a good yield of 98.15%. Current research highlights the significant application of NDGCAF light-harvesting photocatalysts in the research field of organic transformations. [ABSTRACT FROM AUTHOR]

The combination of excellent electronic properties and thermal stability positions orange‐derived graphene quantum dots (GQDs) as promising materials for solar light‐based applications. Researchers are actively exploring their potential in fields such as photovoltaics, photocatalysis, optoelectronics, and energy storage. Their abundance, cost‐effectiveness, and eco‐friendly nature further contribute to their growing relevance in cutting‐edge scientific research. Furthermore, only GQDs are not much more effective in the UV‐visible region, therefore, required band gap engineering in GQDs material. In this context, we designed GQDs‐based light harvesting materials, which is active in UV‐visible region. Herein we synthesized GQDs coupled with 2,6‐diaminoanthrquninone (AQ), that is, GQDs@AQ light harvesting photocatalyst the first time for the oxidation of sulfide to sulfoxide under visible light. For the integrating reactions of sulfide in aerobic conditions under visible light by GQDs@AQ photocatalyst exhibit utmost higher photocatalytic activity than simple GQDs due to low molar extinction coefficient and slow recombination charges. The use of GQDs@AQ light harvesting photocatalyst, showed the excellent organic transformation efficiency of sulfide to sulfoxide with excellent yield (94%). The high efficiency and excellent yield of 94% indicate the effectiveness of GQDs@AQ as a photocatalyst for these specific organic transformations. [ABSTRACT FROM AUTHOR]

Mimicking natural photosynthesis is a promising way to produce fine chemicals, yet there is a need for efficient catalysts. Here, we synthesized a photocatalyst made of self-assembled graphitic carbon nitride/sulfur/cobalt (III) tetraphenyl porphyrin, and we used this photocatalyst for production of the l-glutamate amino acid in 93.6% yield. Regeneration of the 1,4-dihydronicotinamide adenine dinucleotide cofactor under visible light reached 88.3%. [ABSTRACT FROM AUTHOR]

The synthesis of pharmaceutically active 1,2,3-triazoles has been continuously scrutinized in the search for unique and effective catalysts to make the process efficient, green, and sustainable. Here, we are presenting a new visible light active Ni(ii) cyclam-integrated triazole-linked organic polymer (Ni-TLOP) photocatalyst for the synthesis of 1,2,3-triazole compounds with excellent efficiency and regioselectivity. The reaction was studied for a series of substrates and the absolute regioselectivity of a representative triazole product has also been confirmed by X-ray crystallography. The proficiency and chemical orthogonality of the Ni-TLOP are remarkable and it shows enhanced efficiency and regioselectivity. The use of a recyclable photocatalyst and non-hazardous reagents makes the catalytic system sustainable and environmentally friendly. This photocatalyzed click reaction technique has been successfully applied to the expedient synthesis of one of the most sold anti-epileptic drugs rufinamide. [ABSTRACT FROM AUTHOR]

Functionalized graphene quantum dots (fGQDs) as visible-light-harvesting photocatalysts for solar fuel production from CO2 is explored for the first time. The highly efficient light-harvesting fGQDs photocatalyst upon integration with the biocatalyst performs highly selective CO2 reduction to formic acid. The results are a benchmark example of GQD based materials as photocatalysts for selective production of solar fuels from CO2 and opens up possibilities for greener synthesis of other value added chemicals. [ABSTRACT FROM AUTHOR]

Abstract: Herein, we report the preparation, characterization and investigation of previously unexplored W incorporated iron vanadate (FeVO4) electrodes for solar light driven water oxidation in photoelectrochemical cell. The W incorporated FeVO4 films on F-doped SnO2 substrates have been prepared by layer-by-layer deposition of metal–organic precursor and subsequent thermal decomposition at 550 °C in air. The synthesized films with a band gap of about 2.06 eV are responsive to visible light up to wavelength of ∼600 nm, i.e. being able to harvest ∼45% of the solar spectrum. The W incorporated FeVO4 photoanodes are active materials for photoelectrochemical water oxidation and, yield a significantly enhanced (2.5 fold higher) photocurrent in comparison to pristine FeVO4 photoanodes. This improvement can be attributed to increased n-type conductivity by W6+ ion doping in the FeVO4 lattice. The incident photon to current conversion efficiency achieved with developed photoanodes is as high as 6.5% at 400 nm. [Copyright &y& Elsevier]

C60‐based polymeric systems have been constantly anticipated for sustainable solar energy conversion. Reported, herein is a C60 polymer film as visible light active photocatalyst for efficient and selective reduction of CO2 for the first time. The C60 polymer photocatalyst is synthesized via covalent coupling of C60 monomer units consisting of tetra substituted C60‐pyrene conjugates through spacer groups. The synthesized C60 polymer photocatalyst possesses an extended network of well‐defined repeating monomer units with good stability and visible light‐induced photocatalytic activity. The enhanced visible light harvesting ability of C60 polymer photocatalyst reasonably yields it with higher catalytic ability than its monomer unit. The C60 polymer film photocatalyst upon coupling with the biocatalyst carries out highly selective visible light driven reduction of CO2 to HCOOH (239.46 μmol). The tandem way of incorporating C60 into visible light active polymeric films for continuous use may be highly rewarding for their extended photocatalytic activity for solar fuel production from CO2. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48536. [ABSTRACT FROM AUTHOR]

Nicotinamide Adenine Dinucleotide Phosphate (NAD(P)H) plays an important role in numerous biologically significant redox reactions. The photochemical restoration of its oxidized form (NAD(P)+) under physiological conditions is intriguing in the context of integrated photo and catalysis. Herein, we report the functionalized graphitic carbon‐based solar light active photocatalyst by doping boron and fluorine in the native graphitic carbon nitride (GCN) (nonfunctionalized) for the regeneration of enzymatically visible light active coenzyme and in photo‐acetalization reactions. The metal‐free functionalized photocatalyst systems such as BFGCN‐x leads to higher yield NADH and NADPH regeneration. They are also capable of catalyzing acetal reactions in the absence of any Lewis and Bronsted acids. The current research endeavor provides the advancement and the application of functionalized GCN‐based photocatalysts for NADH (61.89%), NADPH (59.84%) regeneration, and photo‐acetalization reactions. [ABSTRACT FROM AUTHOR]

• In-situ boron-fluorine functionalized sulfur-doped graphitic carbon nitride (BFx-SGCN) as a multifunctional heterogeneous synergistic photocatalyst for cyclization reactions along with cofactor regeneration engineering. • Modification of SGCN where boron (B) and fluorine (F) atoms are intentionally introduced or vacancies of these atoms are created within the SGCN structure. • The current research work provides a benchmark example of a BF1.0-SGCN photocatalyst for NADH regeneration cofactor with excellent yield (73.47 %) and triggered synthesis of 3,5-diphenyl 1,2,4-thiadiazole derivatives via N-S bond activation with high yield 94 % under ambient conditions. • The goal of the research is to investigate how the photocatalyst's constituent parts can work together to improve performance in certain applications. In-situ boron-fluorine functionalized sulfur-doped graphitic carbon nitride (BF x -SGCN, x = 1, 1.5, and 2.0 ml) as a multifunctional heterogeneous synergistic photocatalyst for the cyclization reactions and cofactor regeneration engineering. This refers to a modification of SGCN where boron (B) and fluorine (F) atoms are intentionally introduced, or vacancies of these atoms are created within the SGCN structure. This modification is likely aimed at altering the electronic properties and surface chemistry of SGCN to enhance its photocatalytic activity. It was verified that the numerous active sites and enhanced BF vacancies worked in concert to improve the band gap, photoinduced carrier carriers, and visible light absorption efficiency. In this context, the current research work provides a benchmark example of a BF 1 -SGCN photocatalyst for NADH regeneration with excellent yield (73.47 %) in 90 minutes and triggered oxidative cyclization of aromatic primary thioamides (synthesis of 3,5-diphenyl 1,2,4-thiadiazole derivatives) via N-S bond activation with high yield 94 % in 6 hours under ambient conditions. The goal of the research is to investigate how the photocatalyst's constituent parts can work together to improve performance in certain applications. [Display omitted] [ABSTRACT FROM AUTHOR]

• Thermal polymerization of melamine. • Fabrication of g-C 3 N 4 based photoactive photocatalyst. • Synthesis of selectively synthesized pharmaceutical materials. • Oxidative coupling of aryl amines. Oxidative coupling of amine derivatives to selectively synthesize pharmaceutical materials has been realized via photocatalysis. Herein we report on the fabrication and development of a graphitic carbon nitride (G) based visible light active photocatalyst (G-PTD), which is melamine converted graphitic carbon nitride(G) covalently integrated to a light harvesting perylene tetracarboxylic dianhydride (PTD) molecule. The synthesized photocatalyst has various functions in a highly active manner leading to high yield of newly generated azoaromatic compound. The current research endeavour highlights on the fabrication and utilization of a graphitic carbon nitride based photocatalyst for direct oxidative coupling of arylamines. [Display omitted] [ABSTRACT FROM AUTHOR]

• Easy to make graphene-based visible light active photocatalyst (N en G-RhB) via condensation. • The N en G-RhB photocatalyst appears to be a noteworthy development, demonstrating its efficiency in the degradation of industrial orange g in the presence of solar light as well as the oxidative cyclization of aromatic thioamide. • Its potential for useful applications in solar-driven catalysis and environmental remediation is shown by the remarkable degradation efficiency of 97.29 % for the industrial dye and a high conversion rate of 92.5 % for the cyclization. This may open the door to more eco-friendly and productive procedures across a range of sectors. Functionalized photocatalysts have shown to be an effective method for oxidative cyclization processes and the degradation of organic poisons like chemicals and dyes. In this study, we report the facile, environmentally friendly, room-temperature (RT) synthesis and development of a graphene-based visible light active photocatalyst (NenG-RhB) which is thermodynamically converted to nitrogen-enriched graphene (NenG) covalently bonded to a light-harvesting RhB molecule [9-(2-Carboxyphenyl)-6-(diethylamino)-N, N‑diethyl-3H-xanthen-3-iminium chloride)]. The NenG-RhB photocatalyst is extremely effective, resulting in good oxidative cyclization of aromatic thioamide (92.5 %) and degradation efficiency of industrial orange G (97.29 %) under solar light. The current research focuses on the invention and implementation of a nitrogen-enrich graphene-based photocatalyst for direct solar medicinal chemical synthesis and industrial dye degradation in wastewater using solar light. [ABSTRACT FROM AUTHOR]

Functionalized graphene quantum dots (fGQDs) as visible-light-harvesting photocatalysts for solar fuel production from CO2 is explored for the first time. The highly efficient light-harvesting fGQDs photocatalyst upon integration with the biocatalyst performs highly selective CO2 reduction to formic acid. The results are a benchmark example of GQD based materials as photocatalysts for selective production of solar fuels from CO2 and opens up possibilities for greener synthesis of other value added chemicals. [ABSTRACT FROM AUTHOR]

• Highly efficient protein/graphitic carbon nitride/sulfur hydrogel photocatalyst. • Artificial photosynthetic system for mimicking natural photosynthesis. • 86.78% Nicotinamide adenine dinucleotide regeneration in 2 h. • 90.0% l -Glutamate production from α-ketoglutarate under visible light irradiation. Artificial photosynthesis process is a nature inspired process that can convert solar energy to important value added chemicals. Here, we report the synthesis of a self-assembled protein and carbon nitride/sulfur hydrogel (Fmoc- d -PheA/g-C 3 N 4 /S) as a visible light active hydrogel photocatalyst for 86.78% reduced nicotinamide adenine dinucleotide (NADH) regeneration and 90.0% l -Glutamate production under solar light irradiation. The present work represents a new benchmark example for NADH regeneration and solar chemical production. [ABSTRACT FROM AUTHOR]

Natural photosynthesis is the primary route that supplies energy required for the endurance of all living things. The initial step in this process is the absorption of solar light by an organic-inorganic molecular organization called a light harvesting complex. This complicated natural solar energy conversion platform has inspired scientists to create artificial counter parts. As a means to achieve this, a self-assembled light harvesting carbon nitride/cobalt tetra-phenyl-porphyrin (CN/Co(III)TPP) material as a highly selective solar light active photocatalyst has been developed. The system exhibited excellent NADH regeneration (87.87%) and L-glutamate (94.30%) production under visible light irradiation. The current research endeavor highlights the development and application of a self-assembled CN/Co(III)TPP photocatalyst for the selective production of L-glutamate from α-ketoglutarate. Unlabelled Image • A self-assembled light harvesting carbon nitride/cobalt tetra-phenyl-porphyrin (CN/Co(III)TPP) photocatalyst was synthesized • As prepared photocatalyst is characterized by several characterization techniques to determine physio-chemical properties. • Visible light active CN/Co(III)TPP photocatalyst is used for 1,4-NADH regeneration and L -glutamate production. • The yield of NADH regeneration and L -glutamate production were found to be 87.9% and 94.3%, respectively in 60 min. [ABSTRACT FROM AUTHOR]