Mono- and Bimetallic Nanoparticles for Catalytic Degradation of Hazardous Organic Dyes and Antibacterial Applications

Shilpa Molakkalu Padre; S Kiruthika; Shridhar Mundinamani; Ravikirana; Srivathsava Surabhi; Jong-Ryul Jeong; Kunabevu Mallikarjunappa Eshwarappa; Mudiyaru Subrahmanya Murari; Vignesh Shetty; Mamatha Ballal; Gurumurthy S C

doi:10.1021/acsomega.2c03784

Mono- and Bimetallic Nanoparticles for Catalytic Degradation of Hazardous Organic Dyes and Antibacterial Applications

ACS Omega. 2022 Sep 20;7(39):35023-35034. doi: 10.1021/acsomega.2c03784. eCollection 2022 Oct 4.

Authors

Affiliations

¹ Nanomaterials and Polymer Physics Lab, Department of Physics, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India.
² Department of Sciences, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India.
³ Department of Physics, School of Electrical & Electronics Engineering (SEEE), SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India.
⁴ Department of Physics, Siddaganga Institute of Technology, Tumakuru 572103, Karnataka, India.
⁵ Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur 603203, Tamil Nadu, India.
⁶ Laboratorio de Nanocompuestos, Departamento de Ingeniería de Materiales (DIMAT), Facultad de Ingeniería (FI), Universidad de Concepción (UdeC), Concepción 4030000, Chile.
⁷ Department of Materials Science and Engineering, Graduate School of Energy Science and Technology, Chungnam National University, Daejeon 34134, South Korea.
⁸ Department of Studies in Physics, Davanagere University, Shivagangothri, Davanagere 577007, Karnataka, India.
⁹ DST PURSE Lab, Mangalore University, Mangalagangotri 574 199, Karnataka, India.
¹⁰ Department of Medicine, University of Cambridge, Cambridge CB2 1TN, United Kingdom.
¹¹ Department of Microbiology, Kasturba Medical College, Manipal Academy of Higher Education, Manipal 576104, Karnataka, India.

Abstract

In the present work, gold (Au), silver (Ag), and copper (Cu) based mono- and bimetallic NPs are prepared using a cost-effective facile wet chemical route. The pH for the synthesis is optimized in accordance with the optical spectra and supported by the finite difference time domain simulation studies. FESEM and TEM micrographs are used to analyze the morphology of the prepared nanoparticles. TEM images of bimetallic nanoparticles (BMPs) verified their bimetallic nature. XRD studies confirmed the formation of fcc-structured mono- and bimetallic NPs. Photoluminescence studies of the as-synthesized NPs are in good agreement with the previous publications. These synthesized NPs showed enhanced catalytic activity for the reduction/degradation of 4-nitrophenol, rhodamine B, and indigo carmine dyes in the presence of sodium borohydride (NaBH₄) compared to NaBH₄ alone. For the reduction of 4-nitrophenol, Au, Cu, and CuAg nanoparticles exhibited good catalytic efficiency compared to others, whereas for the degradation of rhodamine B and indigo carmine dyes the catalytic efficiency is comparatively high for CuAg BMPs. Furthermore, the antibacterial assay is carried out, and Ag NPs display effective antibacterial activity against Klebsiella pneumoniae, Salmonella ser. Typhimurium, Acinetobacter baumannii, Shigella flexneri, and Pseudomonas aeruginosa.