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RISS 인기검색어
- 검색키워드
- 저자 : Aparna Prabha Devi (검색결과 2 건)
- 무료
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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.
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Ashish Madhual,Aparna Prabha Devi,Pravat Manjari Mishra 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
Residual dyes on the earth’s surface are considered the most endangered and hazardous chemical waste,which severely contaminates the environment. Hence, systematic and strategic protocols should be carriedout to degrade these dyes. The utilization of solar energy as the renewable energy carrier and semiconductorphotocatalysts as the recyclable and sustainable catalyst for dye degradation is considered apromising method to monitor environmental remediation. Here we report a sustainable photocatalystusing room temperature-assisted green synthesis of hybrid plasmonic Au/g-CN photocatalyst using A. carambola leaf extract as a reducing as well as a stabilizing agent for Au nanoparticles (AuNPs) for degradationof RhB. The biomolecules present in the leaf extract reduce Au+3 to Au0 over the 2D surface of g-CNwithout using any toxic chemical-reducing agents. The structural, elemental, morphological, and opticalproperties of prepared nanocomposites are characterized by XRD, FTIR, XPS, TEM, HAADF-STEM, and PLtechniques. The AuNPs successfully anchored on the surface of g-CN, having an average diameter of 25±1nm. The photocatalytic degradation efficiency of 3Au/g-CN was found to be 99.4% for 10 ppm of RhBaqueous solution. The kinetics of the degradation were found to follow a pseudo-first-order reaction witha rate constant of 0.169 min1. The photo-harvesting ability is enhanced by both the surface plasmon resonance(SPR) effect of Au and the electron-acceptor property of g-CN. Moreover, the 3Au/g-CN plasmoniccomposite was reusable up to 5 cycles.
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