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( Palanivel Velmurugan ),심재홍,오병택,조민 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Due to the mining, industrial and agricultural activities, nitrate and phosphate are largely released to aquatic systems and also hazardous to human health. To protect the environment, it is sensible to have them removed from waters. Hence, this study focus on removal of nitrate and phosphate in water using fabricated nanocomposite absorbent by green chemistry approach. FTIR spectra, HR-TEM, elemental mapping and XRD pattern revels that 160 °C for 24 h of hydrothermal treatment is effective to obtain well crystalline with RGO coated Fe doped ZnO nanocomposite crystals. With this obtained nanocomposite adsorbent nitrate and phosphate will be removed effectively. <sup>**</sup>This work was supported by the Korean National Research Foundation (Nano-Material Fundamental Technology Development, 2016M3A 7B4909370) and Korea Ministry of Environment as Advanced Technology Program for Environmental Industry (Project no. 2014000140003).
One-step phyto-mediated fabrication of silver nanoparticles and its anti-microbial properties
Velmurugan Palanivel,Sung-Chul Hong,Veera Ravi Arumugam,Sivakumar Subpiramaniyam,Pyong-In Yi,Seong-Ho Jang,Jeong-Min Suh,Eun-Sang Jung,Je-Sung Park Techno-Press 2023 Advances in nano research Vol.14 No.4
This manuscript describes the one-step eco-friendly green fabrication of silver nanoparticles (AgNPs) through the in-situ bio-reduction of an aqueous solution of silver nitrate using Syzygium aromaticum leaf extract. UV-vis spectroscopy shows a characteristic SPR peak around 442 nm. FTIR spectroscopy showed that the AgNPs were capped with bioactive phyto-molecules. TEM images revealed oval and spherical particles with a mean diameter of ~12.6 nm. XRD analysis revealed crystalline and face-cantered cubic AgNPs. The phytosynthesized AgNPs showed broad-spectrum anti-microbial activity against two foodborne pathogenic bacteria, Listeria monocytogenes and Staphylococcus aureus. The AgNPs showed a prominent ability to inhibit biofilms formed by L. monocytogenes and S. aureus in laboratory conditions through a crystal violet assay. The results suggest that the AgNPs could be a novel nanotool to develop effective antimicrobial and anti-biofilm agents in food preservation.
Palanivel Velmurugan,명현,Muthusamy Govarthanan,이영주,서상기,조광민,Nanh Lovanh,오병택 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.3
A total of five bacterial strains were isolated from earthworm, Eisenia fetida and examined for bacterial cellulose (BC) production in Hestrin–Schramm medium (HS). Among the five strains tested, CBNU-EW3 exhibited excellent BC production and was identified as Leifsonia sp. by 16S rDNA sequence analysis. BC production by Leifsonia sp. CBNU-EW3 was optimum at pH 5, 30°C, and with glucose and yeast extract as carbon and nitrogen sources, respectively, according to 15 day-long experiments. (XRD) analysis of the dried pellicle indicated that the BC was partially crystalline type I. Fourier transform infrared spectroscopy (FT-IR) analysis showed that the obtained pellicle contained the same functional groups as typical BC. Field emission scanning electron microscopy (FESEM) images showed that the BC micro-fibril matrix consisted of a flat surface with large pore size and cellulose aggregation.
Velmurugan, Palanivel,Iydroose, Mahudunan,Lee, Sang-Myung,Cho, Min,Park, Jung-Hee,Balachandar, Vellingiri,Oh, Byung-Taek Association of Microbiologists of India 2014 Indian journal of microbiology Vol.54 No.2
<P>This study reveals a green process for the production of multi-morphological silver (Ag NPs) and gold (Au NPs) nanoparticles, synthesized using an agro-industrial residue cashew nut shell liquid. Aqueous solutions of Ag(+) ions for silver and chloroaurate ions for gold were treated with cashew nut shell extract for the formation of Ag and Au NPs. The nano metallic dispersions were characterized by measuring the surface plasmon absorbance at 440 and 546?nm for Ag and Au NPs. Transmission electron microscopy showed the formation of nanoparticles in the range of 5-20?nm for silver and gold with assorted morphologies such as round, triangular, spherical and irregular. Scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction analyses of the freeze-dried powder confirmed the formation of metallic Ag and Au NPs in crystalline form. Further analysis by Fourier transform infrared spectroscopy provided evidence for the presence of various biomolecules, which might be responsible for the reduction of silver and gold ions. The obtained Ag and Au NPs had significant antibacterial activity, minimum inhibitory concentration and minimum bactericidal concentration on bacteria associated with fish diseases.</P>
Palanivel Velmurugan,Ravichandran Visnu Kumar,Ravichandran Visnu Kumar,Ravi Arumugam Veera 한국탄소학회 2022 Carbon Letters Vol.32 No.1
An extract of fresh guava leaves (Psidium guajava) was used as a green carbon precursor to fabricate blue fluorescent carbon quantum dots (GCQDs) by hydrothermal process. The GCQDs show bright blue fluorescence emission under UV light with an excitation wavelength of 350 nm and emission at 450 nm. The physical structure of GCQDs was characterized by Fourier-transform infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), High-resolution transmission electron microscope (HR-TEM) and atomic force microscopy (AFM). GCQDs 80 µg inhibited the growth of waterborne pathogens Escherichia coli and Salmonella typhi. We also investigated the catalytic activity of the GCQDs on the removal of two azo dyes, namely Congo red and bromophenol blue, with and without NaBH4. The GCQDs showed an excellent reduction of color intensity of both dyes without NaBH4 within 30 min of treatment.
Velmurugan, Palanivel,Shim, Jaehong,Seo, Sang-Ki,Oh, Byung-Taek THE KOREAN FIBER SOCIETY 2016 FIBERS AND POLYMERS Vol. No.
This study evaluated the extraction of two colors of dye (yellow and brown) from Coreopsis tinctoria flower petals using ultrasound and the dyeing of leather with the extracted dyes as a source of nontoxic and eco-friendly dye. The results showed an increase in the dye extraction values with increasing time at 100 W ultrasonic power at <TEX>$80^{\circ}C$</TEX> for 1 h. Leather dyeing was optimized with the aid of ultrasound and magnetic stirring. The optimum leather dyeing conditions, with respect to the dye uptake, dye penetration and intensity of the color, were determined to be 12 % dye concentration, 100 W power, 1,000 rpm, and pH 7.0 for 60 min at <TEX>$80^{\circ}C$</TEX>. It was shown that sonication improves dye exhaustion from a 90 % to 60 % rating for 1 h of dyeing time. The dyed leather was assessed by reflectance measurements and compared with visual assessment data. The fastness properties of dyed leather samples showed good fastness against washing, light, and dry and wet rubbing. The strength properties were not significantly altered and the bulk properties, such as softness, were found to be improved by the use of Coreopsis tinctoria yellow and brown dyes using an ultrasonic and magnetic stirring dyeing process.
( Palanivel Velmurugan ),조민,오병택 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
A green, eco-friendly approach for the synthesis of zinc oxide nanoparticles using Prunus x yedoensis leaf extract as reducing agent. Initial verification of ZnO NPs production was done by visual observation and measuring surface plasmon spectra at 436 nm. The synthesized ZnO NPs was characterized by HR-TEM, XRD, EDS, FTIR and zeta potential. The catalytic potential of Prunus x yedoensis leaf extract, zinc ion, synthesized ZnO NPs, commercial grade ZnO NPs and a Prunus x yedoensis leaf extract and ZnO NPs immobilized on sodium alginate hydrogel beads (SA HGB) were analyzed. The ability of these immobilized materials to remove methylene blue was investigated. Commercial grade ZnO NPs immobilized with SA HGB 0.5 g/20 mL were observed to have good catalytic activity followed by a mixture of synthesized ZnO NPs immobilized with SA HGB and Prunus x yedoensis leaf extract immobilized with SA HGB at 1.0 g/20 mL.