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Velmurugan, P.,Kim, J.I.,Kim, K.,Park, J.H.,Lee, K.J.,Chang, W.S.,Park, Y.J.,Cho, M.,Oh, B.T. Elsevier Sequoia 2017 Journal of photochemistry and photobiology. B, Bio Vol.173 No.-
The main objective of this study was to extract natural colorant from purple sweet potato powder (PSPP) via a water bath and ultrasound water bath using acidified ethanol (A. EtOH) as the extraction solvent. When optimizing the colorant extraction conditions of the solvents, acidified ethanol with ultrasound yielded a high extraction capacity and color intensity at pH2, temperature of 80<SUP>o</SUP>C, 20mL of A. EtOH, 1.5g of PSPP, time of 45min, and ultrasonic output power of 75W. Subsequently, the colorant was extracted using the optimized conditions for dyeing of textiles (leather, silk, and cotton). This natural colorant extraction technique can avoid serious environmental pollution during the extraction and is an alternative to synthetic dyes, using less solvent and simplified abstraction procedures. The extracted purple sweet potato natural colorant (PSPC) was used to dye leather, silk, and cotton fabrics in an eco-friendly approach with augmented antibacterial activity by in situ synthesis of silver nanoparticles (AgNPs) and dyeing. The optimal dyeing conditions for higher color strength (K/S) values were pH2 and 70<SUP>o</SUP>C for 45min. The colorimetric parameters L<SUP>*</SUP>, a<SUP>*</SUP>, b<SUP>*</SUP>, C, and H were measured to determine the depth of the color. The Fourier transform infrared spectroscopy (FTIR) spectra of undyed control, dyed with PSPC and dyed with blend of PSPC and AgNPs treated leather, silk and cotton fabric were investigated to study the interaction among fiber type, nanoparticles, and dye. The structural morphology of leather and silk and cotton fabrics and the anchoring of AgNPs with elemental compositions were investigated by scanning electron microscopy-energy-dispersive X-ray spectroscopy (SEM-EDS). The dry and wet rubbing fastness for dye alone and dye with nanoparticles were grade 4-5 and 4, respectively. Thus, the results of the present study clearly suggest that in situ synthesis of AgNPs along with dyeing should be considered in the development of antimicrobial textile finishes.
Velmurugan, P.,Shim, J.,Oh, B. T. Springer Science + Business Media 2016 Research on chemical intermediates Vol.42 No.6
<P>This study evaluated the performance of amine-functionalized mesoporous hollow spheres obtained using corn cob (an agriculture byproduct) nanosilica as support material for amine immobilization (NH2-MHS) for removal of Congo Red (CR) dye from aqueous solution. Physical characteristics of adsorbents were studied using zeta potential, N-2 adsorption-desorption isotherms, surface area, high-resolution transmission electron microscopy, Fourier-transform infrared spectroscopy, and field-emission scanning electron microscopy. The effects of various physiochemical parameters such as pH (3-9), different adsorbents, temperature (15, 25, and 35 A degrees C), initial dye concentration (10-500 mg/L), and adsorbent dosage (0.1-1.0 g) on the CR removal efficiency were investigated. The equilibrium adsorption data were well fit by the Freundlich model. The maximum adsorption capacity of CR onto NH2-MHS according to the Langmuir isotherm model was 98.72 mg/g at 35 A degrees C and pH 7. The adsorption kinetics were well fit using a pseudo-second-order kinetic model.</P>
Photobiologic-mediated fabrication of silver nanoparticles with antibacterial activity
Lee, J.H.,Lim, J.M.,Velmurugan, P.,Park, Y.J.,Park, Y.J.,Bang, K.S.,Oh, B.T. Elsevier Sequoia 2016 Journal of photochemistry and photobiology Biology Vol.162 No.-
We present the simple, eco-friendly synthesis of silver nanoparticles (AgNPs) using sunlight or green, red, blue, or white LED light together with Dryopteris crassirhizoma rhizome extract (DCRE) as the reducing and capping agent. The preliminary indication of AgNP production was a color change from yellowish green to brown after light exposure in the presence of DCRE. Optimization of parameters such as pH, inoculum dose, and metal ion concentration played an important role in achieving nanoparticle production in 30min. The spectroscopic and morphological properties of AgNPs were characterized using UV-Vis spectroscopy through the presence of a characteristic surface plasmon resonance (SPR) band for AgNPs, Fourier transform infrared spectroscopy (FT-IR), high-resolution transmission electron microscopy (HR-TEM), and X-ray diffraction (XRD). The FT-IR results indicated that the phytochemical present in DCRE was the probable reducing/capping agent involved in the synthesis of AgNPs, and light radiation enhanced nanoparticle production. HR-TEM revealed that the AgNPs were almost spherical with an average size of 5-60nm under all light sources. XRD studies confirmed the face cubic center (fcc) unit cell structure of AgNPs. The synthesized AgNPs showed good antimicrobial activity against Bacillus cereus and Pseudomonas aeruginosa. This study will bring a new insight in ecofriendly production of metal nanoparticles.