It contains all document related to this collection http://27.109.7.66:8080/xmlui/handle/123456789/525 2026-05-01T00:24:06Z 2026-05-01T00:24:06Z Shah, Brijesh Chudasama, Uma http://27.109.7.66:8080/xmlui/handle/123456789/782 2021-12-20T06:40:36Z 2014-01-01T00:00:00Z

Synthesis and characterization of a novel hybrid material titanium amino tris(methylenephosphonic acid) and its application as a cation exchanger Shah, Brijesh; Chudasama, Uma In the present work, a novel hybrid ion-exchange material was synthesized by a sol–gel route, by treating titanium tetrachloride with claw-type amino tris(methylenephosphonic acid) (ATMP) to give titanium amino tris(methylenephosphonic acid) (Ti-ATMP). Ti-ATMP was characterized by elemental analysis (ICP-AES and C, H, N analysis), spectral analysis (FTIR), thermal analysis (TGA), XRD, SEM, and EDX spectroscopy, including physicochemical and ion-exchange characteristics. The equilibrium exchange of transition-metal ions (viz., Cu2+, Ni2+, Co2+ Zn2+) and heavy-metal ions (viz., Pb2+,Cd2+, Hg2+) with the H+ ions contained in ATMP was studied at constant ionic strength and varying temperatures, and various thermodynamic parameters such as the equilibrium constant (K), standard Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were evaluated. The Nernst–Planck equation was used to study the ion-exchange kinetics, and various kinetic parameters, namely, the self-diffusion coefficient (D0), energy of activation (Ea), and entropy of activation (ΔS*), were evaluated under conditions favoring a particle-diffusion-controlled mechanism. Metal-ion adsorptions with variations in concentration and temperature were studied using the Langmuir and Freundlich adsorption isotherms. The distribution coefficient (Kd) and breakthrough capacity (BTC) values for transition- and heavy-metal ions were determined. Based on Kd (mL·g–1), the selectivity order for metal ions toward Ti-ATMP was found to be Cu2+ (19820) > Zn2+(3280) > Co2+ (2630) > Ni2+ (2390) among transition-metal ions and Pb2+ (3590) > Cd2+ (2340) > Hg2+ (610) among the heavy-metal ions. The elution behavior of these metal ions was studied using different acids and electrolytes. A study on regeneration and reuse of the ion exchanger Ti-ATMP shows that it is effective up to five cycles without much decline in performance, which indicates that Ti-ATMP has good potential for use as a cation exchanger. Industrial & Engineering Chemistry Research , 2014

2014-01-01T00:00:00Z Rana, Karan Kambale, Sharad http://27.109.7.66:8080/xmlui/handle/123456789/781 2021-12-20T06:19:02Z 2019-06-01T00:00:00Z

Rediscovery of dicliptera leonotis (acanthaceae) from maharashtra, India Rana, Karan; Kambale, Sharad Dicliptera leonotis Dalzell ex C.B.Clarke is rediscovered after a gap of 144 years. A detailed description, colour photographs and taxonomic notes are provided. The IUCN Red List of Threatened Species, 2017

2019-06-01T00:00:00Z Solanki, Sehnaz H Patil, Sandeep R http://27.109.7.66:8080/xmlui/handle/123456789/775 2021-12-17T06:38:00Z 2021-07-01T00:00:00Z

Phase studies and efficient recovery of inorganic metal salts from the microemulsion system using a sugar-based non-ionic surfactant. Solanki, Sehnaz H; Patil, Sandeep R In the present work, the phase behaviour of the microemulsion system formulated by using water, organic solvent, and a sugar-based non-ionic surfactant was investigated in detail. We have used a sugar-based non-ionic surfactant for formulation of microemulsion, as it is a greener alternative for the formulation of a microemulsion system, owing to the following aspects: a) better physicochemical properties as compared to that of the conventional non-ionic surfactants, b) non-toxicity, and c) biodegradability. The extraction of heavy metal ions from the metal complexes as well as the recovery efficiency of heavy metal ions using a microemulsion system has been investigated. The maximum absorbance values of metal ions, after recovery from the metal complexes, were measured. Moreover, the UV-Visible spectrophotometric studies revealed that the absorbance increases with an increase in metal ion concentration in the aqueous phase while its value decreases with an increase in the concentration of potassium thiocyanate in the aqueous phase after the extraction of the metal ions from the metal complexes. Furthermore, it has also been evaluated that 4.0 mol/L potassium thiocyanate is the optimum concentration required for efficient recovery of 0.05 mol/L cobalt ion as well as nickel ions. The recovery efficiency of cobalt ions was found to be 97%, whereas that of nickel ions was determined to be 94% respectively. In addition to being an environmentally friendly approach, the present work is an economically viable option too, as it deals with the studies related to the extraction and efficient recovery of metal ions. Tenside Surfactants Detergents, vol. 58, no. 4, 2021, P. 265-270

2021-07-01T00:00:00Z Solanki, Sehnaz H Patil, Sandeep R http://27.109.7.66:8080/xmlui/handle/123456789/774 2021-12-17T06:12:47Z 2020-02-01T00:00:00Z

Phase behavior and microstructure of sugar surfactant-ionic liquid microemulsions Solanki, Sehnaz H; Patil, Sandeep R Journal of Dispersion Science and Technology 42(8):1-10, 2020

2020-02-01T00:00:00Z