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Aparna Prabha Devi,Deepak Kumar Padhi,Pravat Manjari Mishra,Ajay Kumar Behera 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.108 No.-
A bio-surfactant assisted synthesis route has demonstrated in room temperature for decoration of goldnanoparticles (AuNPs) on g-C3N4 using Averrhoa carambola leaf extract towards mono-nitrophenol reductionunder visible light irradiation. Biomolecules of the leaf extract and optimised reaction conditionplayed a vital role on tuning the morphology and optoelectronic properties of AuNPs. The size ofAuNPs were found to be 15 ± 3 nm on 2D g-C3N4 sheets by TEM and STEM-HAADF analysis. Amongthe designed plasmonic hybrid photocatalysts 3-wt% loaded AuNPs on g-C3N4 showed 99.01% of 4-nitrophenol, 97.70% of 3-nitrophenol and 98.50% of 2-nitrophenol photoreduction. The photocatalyticefficiency of Au/g-C3N4 was investigated under several parameters such as pH, initial nitrophenol concentration,and in presence of external inorganic anions. The mechanism of photoreduction of nitrophenol toaminophenol by Au/g-C3N4 was proposed based on the intermediate obtained from GCMS analysis. Theobserved higher catalytic activity of plasmonic hybrid photcatalysts is due to the synergic chemistrybetween the conduction band of g-C3N4 and AuNP plasmonic band, which is well supported by PL, EIS,and transient photocurrent analysis. Kinetic rate constant for 3Au/g-C3N4 was found to be 0.43 min1at pH 3. Moreover, the rate of reaction significantly increased in presence of Cl. ICP-OES analysis of assynthesised 3Au/g-C3N4 plasmonic photocatalyst shows there was no gold leaching even after ten cyclesconfirming the stability and reusability of the catalyst.