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Evaluation of the catalytic and antioxidant activity of in situ green synthesized graphene-gold nanocomposite

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2024, 34(4), pp.1207-1218
  • DOI : 10.1007/s42823-023-00684-z
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : August 18, 2023
  • Accepted : December 24, 2023
  • Published : June 14, 2024

Akhil Syed 1 Kumar Porala Jayanth 1 Mosali Venkata Sai Sriram 1 Dutt V. G. Vasavi 1 Kasturi Satish 1 Mullamuri Bhanu 1 Puvvada Nagaprasad 2 Panigrahi Pravas Kumar 3 Chava Rama Krishna 4 Chandu Basavaiah 1

1Acharya Nagarjuna University
2Department of Chemistry, VIT-AP University, Amaravathi
3Department of Basic Sciences, Government College of Engineering
4Yeungnam University

Accredited

ABSTRACT

Integration of noble metals on graphene is renowned for their catalytic and antioxidant prowess. However, utilization of toxic chemicals in the synthesis creates environmental pollution and poisonous nature of chemically synthesized materials. To address this, an economical and eco-friendly method for synthesizing graphene-gold (BRG-Au) nanocomposite by anchoring gold nanoparticles (Au NPs) onto reduced graphene oxide sheets using betel leaf extract as a reducing and stabilizing agent is presented. Comprehensive structural characterizations through UV–Visible, Raman, FT-IR, and XRD analyses confirm the successful formation of the BRG-Au nanocomposite. Morphological assessments utilizing FE-SEM and TEM techniques revealed the presence of transparent, twinkling graphene sheets embellished with 20 to 60 nm of Au NPs in various shapes, including spherical, triangular, pentagonal, circular, and trapezoids. The catalytic and antioxidant activities of the BRG-Au nanocomposite were thoroughly evaluated. In catalytic trials, the nanocomposite exhibited remarkable efficiency in the reduction of 4-nitrophenol to 4-aminophenol, accomplishing this transformation within a mere 30 min during the initial cycle and maintaining stable catalytic performance over three consecutive cycles. Additionally, antioxidant analyses employing Total Antioxidant Activity and 2,2-diphenyl-1-picrylhydrazyl methods demonstrated that BRG-Au nanocomposite possessed equal or superior antioxidant activity than the ascorbic acid standard. This research thus underscores the promising potential of environmentally benign synthesis method for graphene-gold nanocomposite with enhanced catalytic and antioxidant properties.

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