Asian Journal of Research in Chemistry

Som Shankar Dubey ¹, Battula Sreenivasa Rao ¹, B.V. Kiran ¹

Affiliations
1 Department of Chemistry, GITAM Institute of Technology, GITAM University, Visakhapatnam –530045, Andhra Pradesh

Abstract

Removal of cesium from synthetic aqueous solution through adsorption on illite, under batch equilibrium experimental condition at different values of pH and four temperatures (303, 313, 323, 333 K) was investigated. For this propose the suitability of the Freundlich adsorption model for equilibrium data were investigated. The parameters in the adopted adsorption isotherm models were determined. The study of equilibrium isotherm shows that the best model for analysis of experimental data is freundlich model with correlation coefficient higher than 0.99 (both for temperature and pH). The results showed that increasing of pH and temperature increased the adsorption ability of illite. Optimum conditions for adsorption were determined as T=323 K , pH=9, illite dose=1.5 g and contact time of 24 hr. The negative value of the Gibbs free energy G demonstrates the spontaneous nature of cesium adsorption onto illite

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Som Shankar Dubey ¹, Battula Sreenivasa Rao ¹

Affiliations
1 Dept. of Chemistry, GITAM Institute of Technology, GITAM University, Visakhapatnam - 530 045. A.P., IN

Abstract

Adsorption is the surface phenomenon; it is widely application for the recovery/removal of various dyes, heavy metal cations and anions. The kinetics of these phenomena is of great significance to evaluate the performance of a given adsorbent and gain insight into the underlying mechanisms. Adsorption is one of the most widely applied techniques for environmental remediation. There are many types of models existing for catering different types chemical/physical conditions. There is huge amount of literature available concerning adsorption kinetics, and several mathematic models have been developed to describe adsorption reaction and diffusion processes. However, these models were frequently employed to fit the kinetic data in an unsuitable or improper manner. This is mainly because the boundary conditions of the associated models were, to a considerable extent, ignored for data modeling.

Keywords

Adsorption Kinetics, Adsorption Isotherms, Diffusion Kinetics, Models For Adsorption.

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B. Sreenivasa Rao ¹, Som Shankar Dubey ¹, B. S. A. Andrews ¹, A. V. D. Nagendrakumar ¹

Affiliations
1 Dept. of Chemistry, GITAM Institute of Technology, GITAM University, Visakhapatnam - 530 045, AP, IN

Abstract

A sensitive and simple spectrophotometric method was developed for the determination of Chromium(VI) with Isonitriso p-isopropyl Acetophenone Phenyl Hydrazone. Chromium was complexed with Isonitriso p-isopropyl Acetophenone Phenyl Hydrazone and the reddish yellow colour complex was extracted into methyl isobutyl ketone. The absorbance of the complex was maximum at 443 nm. The molar absorptivity of the complex was 2.78 x 10³lit.mol^-1cm^-1 and Sandell’s sensitivity was 2.67 x 10^-2 μg/cm². The system obeyed Beer’s law over the concentration range of 0.5 to 20 ppm. The composition of the complex (metal: ligand) was 1:6. This method was employed for the determination of chromium in Goa Beans and Soya Leaves Sample

Keywords

Extraction, Spectrophotometric, Chromium, Isonitriso p-isopropyl Acetophenone Phenyl Hydrazone.

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Som Shankar Dubey ¹, Battula Sreenivasa Rao ¹, A. V. D. Nagendra Kumar ¹

Affiliations
1 Department of Chemistry, Gitam Institute of Technology, Gitam University, Visakhapatnam-530045, IN

Abstract

Radiotracer technique has been used to study the removal behavior of Hg (II) ions from aqueous solutions by synthesized and well characterized hydrous ferric oxide (HFO) and hydrous tungsten oxide (HTO). Adsorptive concentration (10^-4-10^-8 mol dm^-3), pH (ca 4.0-10.0) and temperature (303-333 K) were examined for assessing optimal conditions for removal of these ions. The uptake of Hg (II) ions, which fitted well for Freundlich isotherm, increased with increase in the temperature and no significant desorption took place in the studied temperature range. The presence of some anions/cations affected the uptake of metal ion markedly. Irradiation of hydrous ferric oxide and tungsten oxide by using a 11.1×10⁹ Bq (Ra-Be) neutron source having a neutron flux of 3.9×10⁶ cm^-2 s^-1 with associated γ-dose rate of 1.72 Gy/h did not influence the extent of adsorption of Hg (II) significantly.

Keywords

Hg (II), Hydrous Ferric Oxide, Tungsten Oxide, Adsorption, Freundlich Isotherm, Desorption.

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