Papaya peel waste carbon dots/reduced graphene oxide nanocomposite:From photocatalytic decomposition of methylene blue to antimicrobial activity  

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作  者:Hesam Salimi Shahraki Rani Bushra Nimra Shakeel Anees Ahmad Quratulen Mehraj Ahmad Christos Ritzoulis 

机构地区:[1]Department of Food Science and Technology,International Hellenic University,Thessaloniki 57400,Greece [2]Department of Chemistry,Aligarh Muslim University,Aligarh 202002,India [3]Department of Food Science and Engineering,College of Light Industry and Food,Nanjing Forestry University,Nanjing 210037,China

出  处:《Journal of Bioresources and Bioproducts》2023年第2期162-175,共14页生物质资源与工程(英文)

摘  要:Carbon dots(CDs)have gained unprecedented attention as a novel luminescent zero-dimensional carbon nanomaterial owing to their diverse industrial applications.Herein,we reported the sus-tainable synthesis of fluorescent CDs from papaya peel waste,acting as a natural carbon orig-inator.As-prepared CDs and reduced graphene oxide(RGO)were fabricated in the composites through a facile one-step hydrothermal method.Synthesized RGO/CDs(RC)nanocomposites were characterized using spectroscopic,diffraction,and electron-microscopic techniques.Nanocom-posites with variable RGO to CD mass ratios were tested for photodegradation of textile dye methylene blue(MB).The highest photocatalytic activity(degradation efficiency of 87%in 135 min)was obtained in the nanocomposite containing a 2꞉1 mass ratio(RC2).The RGO sheets in the nanocomposite acted as media for electron acceptors,promoting the fast transfer and sep-aration of photoinduced electrons during CDs excitation,thus preventing the recombination of the electron and holes.Based on the agar well diffusion assay,the nanocomposites exhibited ex-cellent antibacterial activity than other tested materials against Bacillus subtilis(Gram-positive)and Pseudomonas aeruginosa(Gram-negative)bacterium.The largest inhibition zone area(22 mm),i.e.,the highest antimicrobial activity,was obtained in the nanocomposite tested against Gram-positive strains.Taken together,the synergistic effect of RGO and CDs enhanced the pho-tocatalytic and antibacterial performance of synthesized nanocomposite material.

关 键 词:NANOCOMPOSITE Carbon dot Hydrothermal method PHOTOCATALYSIS Antibacterial activity 

分 类 号:TQ426[化学工程] TB33[一般工业技术—材料科学与工程]

 

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