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RISS 인기검색어
- 검색키워드
- 저자 : H.K. Koduru (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Structural and dielectric properties of NaIO4 - Complexed PEO/PVP blended solid polymer electrolytes
H.K. Koduru,L. Marino,F. Scarpelli,A.G. Petrov,Y.G. Marinov,G.B. Hadjichristov,M.T. Iliev,N. Scaramuzza 한국물리학회 2017 Current Applied Physics Vol.17 No.11
Poly (ethylene oxide) (PEO)/Polyvinyl pyrrolidone (PVP) blended solid polymer electrolytes complexed with NaIO4 salt at different weight percentage ratios were prepared using solution casting technique. Effect of salt complexation on structural properties of pure blend (PEO/PVP) electrolyte was investigated by X-ray diffraction (XRD), Raman spectroscopy and Scanning electron microscopic (SEM) studies. Modifications in glass transition temperature and thermal stability of the blend electrolytes were measured by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) studies. The determined refractive index values from optical absorption spectra were found to increase with the increase of salt concentration. Impedance measurements were made in the frequency range of 0.1 Hz e1 MHz to explore dielectric response and ion dynamics of the blend electrolytes as a function of NaIO4 salt concentration. The PEO/PVP blend complexed with 10 wt% of NaIO4 salt was demonstrated higher room temperature conductivity of 1.56 107 S/cm. The temperature dependence of DC conductivity of blend electrolytes was followed the Arrhenius behaviour. Determined diffusion coefficients (DNaþ) using Trukhan model and estimated mobility (m) values of sodium ions were increased with increase of salt concentration. To get the further insights into the ion dynamics, the complex dielectric permittivity has been modeled with HavriliakeNegami function.
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Removal studies of Cd(II) and explosive compounds using buffalo weed biochar-alginate beads
Roh, H.,Yu, M.R.,Yakkala, K.,Koduru, J.R.,Yang, J.K.,Chang, Y.Y. Korean Society of Industrial and Engineering Chemi 2015 Journal of industrial and engineering chemistry Vol.26 No.-
Synthesized Ambrosia trifida L. var. trifida biochar-alginate beads (ATLB-AB) for treatment of Cd(II),TNT and RDX. In order to check practical applicability of ATLB-AB in large scale waste water treatment, fixed-bed column studies were performed along with batch adsorption studies. The adsorption kinetics was pseudo-second-order kinetics and was well tune with Freundlich isotherm model. The column study results found to be higher breakthrough time and the adsorption efficiency at a flow rate 0.25mL/min. Thomas model was found to be suitable to represent the kinetics of adsorption of Cd(II), TNT and RDX in a fixed bed packed column.
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Lingamdinne, L.P.,Chang, Y.Y.,Yang, J.K.,Singh, J.,Choi, E.H.,Shiratani, M.,Koduru, J.R.,Attri, P. Elsevier 2017 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.307 No.-
The accumulation of heavy metal ions in living cells impairs the organ function of living creatures. So, needs to develop new materials with high efficiency of heavy metals removal from the environment. As part of this effort, here, synthesized magnetic inverse spinel iron oxide nanoparticles (MISFNPs) using a biogenic methodology. To synthesize the biogenic MISFNPs, we used the seed extract of Cnidiummonnieri (L.) Cuss (CLC) as a precursor. The prepared MISFNPs was characterized using PXRD, FT-IR, SEM-EDX, SEM, BET, AFM and XPS. We also investigated the size, surface area, structure and magnetic properties of MISFNPs. Additionally, magnetic property measurement system (MPMS) studies show that our prepared MISFNPs was superparamagnetic at room temperature. Further, we used the MISFNPs for the removal of Pb(II) and Cr(III) from aqueous solutions through batch studies. Batch adsorption studies revealed that Pb(II) and Cr(III) follow pseudo-second-order kinetics during adsorption onto the homogenous surface of MISFNPs. Besides, we also found that the adsorption of Pb(II) and Cr(III) on nanoparticles followed an endothermic process. Lastly, we concluded that MISFNPs synthesized by a green route is capable of recycling and removal of heavy metals without loss of its stability.
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