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Removal of Cd (II) and Cu (II) from Aqueous Solution by Agro Biomass
Desireddy Harikishore Kumar Re,Seung Mok Lee,Kalluru Seshaiah 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.3
The removal of Cd(II) and Cu(II) from aqueous solution by an agricultural solid waste biomass prepared from Moringa oleifera bark (MOB) was investigated. The biosorbent was characterized by Fourier transform infrared spectroscopy and elemental analysis. Furthermore, the effect of initial pH, contact time, biosorbent dosage, initial metal ion concentration and temperature on the biosorption of Cd (II) and Cu (II) were studied using the batch sorption technique. Kinetic studies indicated that the biosorption process of the metal ions followed the pseudo-second order model. The biosorption data was analyzed by the Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. Based on the Langmuir isotherm, the maximum biosorption capacities for Cd(II) and Cu(II) onto MOB were 39.41 and 36.59 mg/g at 323 K, respectively. The thermodynamic parameters, Gibbs free energy (ΔGo), enthalpy (ΔHo), and entropy (ΔSo) changes, were also calculated, and the values indicated that the biosorption process was endothermic, spontaneous and feasible in the temperature range of 303-323 K. It was concluded that MOB powder can be used as an effective, low cost, and environmentally friendly biosorbent for the removal of Cd (II) and Cu (II) ions from aqueous solution.
Basivi, Praveen Kumar,Pasupuleti, Visweswara Rao,Seella, Ramanaiah,Tukiakula, Madhusudana Reddy,Kalluru, Subramanyam Reddy,Park, Soo-Jin American Chemical Society 2017 Journal of chemical and engineering data Vol.62 No.7
<P>The inverse gas chromatography study on the fluconazole drug surface was performed, and the net retention volumes, polar probes, and VN of n-alkanes are determined at four temperatures over the range 318.15-333.15 K. The net retention values of n-alkanes were used to evaluate the London dispersive surface free energy gamma(L)(S) by three different methods, namely, the Donnet Park, Dorris Gray, and Schultz methods. The gamma(L)(S) values were found to increase from 318.15 to 323.15 K for all three methods and then decrease from 323.15 to 333.15 K. The gamma(L)(S) values were found to be slightly higher in the Schultz method when compared to the results of the Donnet-Park and Dorris-Gray methods. The specific free energy values Delta G(a)(s) and the specific enthalpy Delta H-a(s) values have been calculated using the V-N data of polar probes. The Guttmann Lewis acid base parameters, K-a and K-b, were obtained using Delta H-a(s) values and were found to be 0.217 and 1.518, respectively. The surface character (K-b/K-a) was found to be 7.0. The results revealed that the fluconazole powder surface contains relatively more basic sites than acidic sites and can combine strongly with acidic substrates. The surface energy and acid base data of fluconazole can be used during formulation of the drug and to understand the drug release process.</P>
Reddy, Desireddy Harikishore Kumar,Lee, Seung-Mok,Seshaiah, Kalluru Korean Society of Environmental Engineers 2012 Environmental Engineering Research Vol.17 No.3
The removal of Cd(II) and Cu(II) from aqueous solution by an agricultural solid waste biomass prepared from Moringa oleifera bark (MOB) was investigated. The biosorbent was characterized by Fourier transform infrared spectroscopy and elemental analysis. Furthermore, the effect of initial pH, contact time, biosorbent dosage, initial metal ion concentration and temperature on the biosorption of Cd(II) and Cu(II) were studied using the batch sorption technique. Kinetic studies indicated that the biosorption process of the metal ions followed the pseudo-second order model. The biosorption data was analyzed by the Langmuir, Freundlich, Dubinin-Radushkevich, and Temkin isotherm models. Based on the Langmuir isotherm, the maximum biosorption capacities for Cd(II) and Cu(II) onto MOB were 39.41 and 36.59 mg/g at 323 K, respectively. The thermodynamic parameters, Gibbs free energy (${\Delta}G^o$), enthalpy (${\Delta}H^o$), and entropy (${\Delta}S^o$) changes, were also calculated, and the values indicated that the biosorption process was endothermic, spontaneous and feasible in the temperature range of 303-323 K. It was concluded that MOB powder can be used as an effective, low cost, and environmentally friendly biosorbent for the removal of Cd(II) and Cu(II) ions from aqueous solution.
Synthesis of VO2 (B) nanorods for Li battery application
Ch.V. Subba Reddy,Edwin H. Walker Jr.,S.A. Wicker Sr.,Quinton L. Williams,Rajamohan R. Kalluru 한국물리학회 2009 Current Applied Physics Vol.9 No.6
Vanadium dioxide nanorods were synthesized through a hydrothermal reaction from V2O5 xerogel, poly (vinyl pyrrolidone) (PVP) and lithium perchlorate (LiClO4). The prepared samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical discharge–charge cycling in lithium battery. SEM images reveal the nanorods to have dimensions on the order of 1–3 ㎛ in length and 10–50 nm in diameter. The measured initial discharge capacity of the lithium battery with a cathode made of VO2 (B) nanorods was 152 mA h/g. Vanadium dioxide nanorods were synthesized through a hydrothermal reaction from V2O5 xerogel, poly (vinyl pyrrolidone) (PVP) and lithium perchlorate (LiClO4). The prepared samples were characterized by X-ray diffraction, infrared spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and electrochemical discharge–charge cycling in lithium battery. SEM images reveal the nanorods to have dimensions on the order of 1–3 ㎛ in length and 10–50 nm in diameter. The measured initial discharge capacity of the lithium battery with a cathode made of VO2 (B) nanorods was 152 mA h/g.