title: EGCG assisted green synthesis of ZnO nanopowders: Photodegradative, antimicrobial and antioxidant activities.
abstract: Zinc oxide nanopowders were synthesized by solution combustion method using Epigallocatechin gallate (EGCG) a tea catechin as fuel. The structure and morphology of the product was characterized by Powder X-ray Diffraction, Scanning Electron Microscopy, photoluminescence and UV-Visible spectroscopy. The nanopowders (Nps) were subjected to photocatalytic and biological activities such as antimicrobial and antioxidant studies. PXRD patterns demonstrate that the formed product belongs to hexagonal wurtzite system. SEM images show that the particles are agglomerated to form sponge like structure and the average crystallite sizes were found to be ∼10-20nm. PL spectra exhibit broad and strong peak at 590nm due to the Zn-vacancies, and O-vacancies. The prepared ZnO Nps exhibit excellent photocatalytic activity for the photodegradation of malachite green (MG) and methylene blue (MB) indicating that the ZnO NPs are potential photocatalytic semiconductor materials. ZnO NPs exhibit significant bactericidal activity against Klebsiella aerogenes, Pseudomonas aeruginosa, Escherichia coli and Staphylococcus aureus using the agar well diffusion method. Furthermore, the ZnO nano powders show good antioxidant activity by potentially scavenging DPPH radicals. The study successfully demonstrates synthesis of ZnO NPs by simple ecofriendly route employing EGCG as fuel that exhibit superior photodegradative, antibacterial and antioxidant activities.
authors.affiliation: Department of Studies and Research in Chemistry, Tumkur University, Tumkur, Karnataka 572 103, India. Electronic address: pbdsuresh@gmail.com.
authors.forename: D
authors.initials: D
authors.lastname: Suresh
authors.affiliation: Department of Studies and Research in Chemistry, Tumkur University, Tumkur, Karnataka 572 103, India.
authors.lastname: Udayabhanu
authors.affiliation: Department of Studies and Research in Chemistry, Tumkur University, Tumkur, Karnataka 572 103, India.
authors.forename: P C
authors.initials: PC
authors.lastname: Nethravathi
authors.affiliation: Department of Studies and Research in Environmental Science, Tumkur University, Tumkur, Karnataka 572 103, India.
authors.forename: K
authors.initials: K
authors.lastname: Lingaraju
authors.affiliation: Department of Studies and Research in Environmental Science, Tumkur University, Tumkur, Karnataka 572 103, India.
authors.forename: H
authors.initials: H
authors.lastname: Rajanaika
authors.affiliation: Chattisgarh Swami Vivekanand Technical University, Bhilai, Chattisgarh, India.
authors.forename: S C
authors.initials: SC
authors.lastname: Sharma
authors.affiliation: Prof. C.N.R. Rao Centre for Advanced Materials, Tumkur University, Tumkur, Karnataka 572 103, India.
authors.forename: H
authors.initials: H
authors.lastname: Nagabhushana
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000975:Antioxidants / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D002384:Catalysis; D002392:Catechin / Q000031:analogs & derivatives* / Q000737:chemistry / Q000378:metabolism; D021902:Enterobacter aerogenes / Q000187:drug effects; D055772:Green Chemistry Technology / Q000379:methods; D053768:Metal Nanoparticles / Q000737:chemistry; D008826:Microbial Sensitivity Tests; D010782:Photolysis; D011208:Powders / Q000138:chemical synthesis / Q000737:chemistry; D013211:Staphylococcus aureus / Q000187:drug effects; D015034:Zinc Oxide / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D000975:Antioxidants; D011208:Powders; D002392:Catechin; C045651:epigallocatechin gallate; D015034:Zinc Oxide
keywords: Combustion method; Luminescence; Methylene blue; Photodegradation; Zinc oxide nanopowders