Effect of Hybrid mono/bimetallic Nanocomposites for an enhancement of Catalytic and Antimicrobial Activities

Kuppan Sivaranjan,Suresh Sagadevan,Malairaj Sathuvan,Anbazhagan Sathiyaseelan,Jayadevan Santhanalakshmi,Osaimany Padmaraj

doi:10.1038/s41598-020-59491-5

Kuppan Sivaranjan, Suresh Sagadevan + Show 4 more

Open Access

https://doi.org/10.1038/s41598-020-59491-5

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Abstract

Exploring the new catalytic systems for the reduction of organic and inorganic pollutants from an indispensable process in chemical, petrochemical, pharmaceutical and food industries, etc. Hence, in the present work, authors motivated to synthesize bare reduced graphene oxide (rGO), polyaniline (PANI), three different ratios of rGO-PANI(80:20,50:50, 10:90) composites and rGO-PANI(80:20,50:50, 10:90) supported mono (Pd) & bimetallic [Pd: Au(1:1,1:2, 2:1)] nanocomposite by a facile chemical reduction method. Also, it investigated their catalytic performances for the reduction of organic/inorganic pollutants and antimicrobial activities. All the freshly prepared bare rGO, PANI, three different ratios of rGO-PANI(80:20, 50:50,10:90) composites and rGO-PANI(80:20, 50:50,10:90)/Pd & Pd: Au(1:1, 1:2,2:1) nanocomposite hybrid catalysts were characterized using UV-Vis, FT-IR, SEM, FE-SEM, EDAX, HR-TEM, XRD, XPS and Raman spectroscopy analysis. Among them, an optimized best composition of rGO-PANI(80:20)/Pd: Au(1:1) bimetallic nanocomposite hybrid catalyst exhibits better catalytic reduction and antimicrobial activities than other composites, as a result of strong electrostatic interactions between rGO, PANI and bimetal (Pd: Au) NPs through a synergistic effect. Hence, an optimized rGO-PANI(80:20)/Pd:Au(1:1) bimetallic nanocomposite catalyst would be considered as a suitable catalyst for the reduction of different nitroarenes, organic dyes, heavy metal ions and also significantly inhibit the growth of S. aureus, S. Typhi as well as Candida albicans and Candida kruesi in wastewater.

Highlights

In recent years, nitroaromatics, organics dyes, and heavy metal ions possess serious environmental issues, especially by releasing toxic and carcinogenic materials in wastewater, which becomes a solemn public concern on human health and safety threats[1,2]
PANI acts as a bridge to facilitate the dispersion of mono or bimetallic nanoparticles over reduced graphene oxide (rGO) sheets through electrostatic interactions, which could be an effective strategy for improving the stability of rGO/PANI/ PANI supported mono (Pd) or Pd: Au nanocomposites, surface area and catalytic active sites
The same procedure was adopted for the synthesis of other two composites [rGO-PANI(50:50) - rGO-50 mg, aniline monomer taken from 0.3 M for 50 ml] and [rGO-PANI(10:90) - rGO-10 mg, aniline monomer taken from 0.3 M for 90 ml] with different ratios of rGO and PANI

Summary

Introduction

Nitroaromatics, organics dyes, and heavy metal ions possess serious environmental issues, especially by releasing toxic and carcinogenic materials in wastewater, which becomes a solemn public concern on human health and safety threats[1,2].

Results

Conclusion