Journal of nanoscience and nanotechnology

1533-48801952019May01Journal of nanoscience and nanotechnologyJ Nanosci NanotechnolGreen Synthesis of Co₃O₄ Nanorods for Highly Efficient Catalytic, Photocatalytic, and Antibacterial Activities.259025982590-259810.1166/jnn.2019.15826Cobalt oxide nanorods were successfully synthesized by a hot plate combustion method using the plant extract of Vitis vinifera. The plant extract as an alternative to toxic chemicals can be used generally as reducing and capping agents. The obtained nanorods were characterized by XRD, FT-IR, Raman, TEM, SAED, EDX, DRS, PL and VSM techniques for the structural, morphological, optical and magnetic properties. The XRD, FT-IR, Raman, EDX analysis confirmed the high purity of the sample. The TEM and SAED results showed the rod shape morphology of the sample. DRS and PL showed the band gap energy and emission at visible region. VSM showed the antiferromagnetic nature of the sample. The photocatalytic activities of the as-prepared cobalt oxide nanorods were investigated for the degradation of textile dying waste water. As per the standards of Indian pollution control board for industrial waste water let out into river bodies, the degradation reactions of waste water was found to be 250 mg/L at 150 min. Also, the same catalyst is used for the reduction of 4-nitrophenol and 4-nitroaniline using sodium borohydride as a reducing agent and it exhibits excellent reduction reaction, because of the high active surface sites. The time taken for the reduction reaction was 300 sec and 210 sec for 4-nitrophenol and 4-nitroaniline respectively. Also, the antibacterial activities towards the bacterial strains were studied and reported.KombaiahKKCatalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College, Chennai 34, India.VijayaJ JudithJJCatalysis and Nanomaterials Research Laboratory, Department of Chemistry, Loyola College, Chennai 34, India.KennedyL JohnLJMaterials Division, School of Advanced Sciences, Vellore Institute of Technology (VIT) University, Chennai Campus, Chennai 127, India.KaviyarasuKKUNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology Laboratories, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Bo× 392, Pretoria, South Africa.RamalingamR JothiRJSurfactant Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.Al-LohedanHamad AHASurfactant Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.engJournal ArticleResearch Support, Non-U.S. Gov't