title: Biological synthesis of manganese dioxide nanoparticles by Kalopanax pictus plant extract.
abstract: Manganese dioxide (MnO₂) nanoparticles were synthesised by the reduction of potassium permanganate (KMnO₄) using Kalopanax pictus leaf extract at room temperature. A transparent dark-brown colour appeared after the addition of K. pictus leaf extract to the solution of permanganate. The time course of the reduction of KMnO₄and synthesis of MnO₂ nanoparticles was monitored by means of UV-Vis spectra. The reduction of KMnO₄occurred after addition of plant extract with disappearance of KMnO₄specific peaks and emergence of peak specific for MnO₂nanoparticles. MnO₂nanoparticles showed absorption maxima at 404 nm. The electron dispersive X-ray spectroscopy analyses confirmed the presence of Mn and O in the sample. X-ray photoelectron spectroscopy revealed characteristic binding energies for MnO₂nanoparticles. Transmission electron microscopy micrographs revealed presence of uniformly dispersed spherical shaped particles with average size of 19.2 nm. The selected area electron diffraction patterns revealed the crystalline nature of MnO₂nanoparticles. Fourier transform-infrared spectroscopy spectra of pure MnO₂show the occurrence of O-Mn-O vibrational mode at around 518 cm⁻¹. The phyto-synthesised MnO₂nanoparticles showed degradation ability of dyes (congo red and safranin O) similar to chemically synthesised MnO₂nanoparticles. This study shows simple and eco-friendly synthesis of MnO₂nanoparticles by plant extract and their utilisation for dye degradation for the first time.
authors.affiliation: Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea.
authors.forename: Sun A
authors.initials: SA
authors.lastname: Moon
authors.affiliation: Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea.
authors.forename: Bipinchandra K
authors.initials: BK
authors.lastname: Salunke
authors.affiliation: Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea.
authors.forename: Bassam
authors.initials: B
authors.lastname: Alkotaini
authors.affiliation: Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea.
authors.forename: Ezhaveni
authors.initials: E
authors.lastname: Sathiyamoorthi
authors.affiliation: Department of Chemical Engineering, Chungbuk National University, Cheongju, Chungbuk 361-763, Republic of Korea. bskim@chungbuk.ac.kr.
authors.forename: Beom Soo
authors.initials: BS
authors.lastname: Kim
mesh_terms: D001709:Biotechnology; D036882:Kalopanax / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry* / Q000378:metabolism; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology; D010087:Oxides / Q000737:chemistry* / Q000378:metabolism; D010936:Plant Extracts / Q000737:chemistry / Q000378:metabolism*
chemical_list: D017895:Manganese Compounds; D010087:Oxides; D010936:Plant Extracts; C016552:manganese dioxide