Jammu and Kashmir Academy of Art, Culture and Languages
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Preparation of Selective Ion Exchange Material for Chemical Analysis by Sol-Gel Method
Get PDFThe sol-gel process provides a versatile method to prepare size, shape and charge
selective materials for analysis. We report the synthesis and characterization of a new
sulphosalicylate doped tetraethoxysilane composite material by sol-gel method. The
synthetic conditions such as reactant concentrations and precipitating agents were
varied to optimize the ion exchange properties of this material. The material has an
ion exchange capacity of 0.64meq/g(dry) for sodium ions, 0.60meq/g(dry) for
potassium ions, 1.84meq/g(dry) for magnesium ions, 1.08meq/g(dry) for calcium ions
and 1.36meq/g(dry) for strontium ions. Its X-ray diffraction studies suggest that it is
crystalline in nature. The material has been characterized by SEM, IR, TGA and DTG
so as to identify the various functional groups and ion exchange sites present in this
material. Further, various ion exchange studies such as determination of ion exchange
capacity, elution behaviour, pH titration, distribution behaviour towards ion exchange
and adsorption behaviour towards certain important dyes have been performed on this
material. This material shows selectivity for Mg (II) among alkaline earth metal ions
and Ni (II) among the transition metal ions in aqueous solutions. This material,
therefore, has potential application for removal of these metal ions from aqueous
systems. The material shows remarkable adsorption behaviour towards
environmentally important representative dyes like malachite green and methylene
blue
Forging a Cultural Identity: A Study of Leslie Marmon Silko’s Ceremony and Select Short Stories
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Impact of Glaciers on the Hydrology of Kashmir Rivers: A Case Study of Kolahoi Glacier
Get PDFGlaciers are a valuable source of fresh water which sustain life and provide water for
drinking, irrigation, hydro power generation, etc. Besides, these exert considerable influence
on the climate of a region and fluctuate in dimension in response to the climatological
changes and therefore, these are regarded as sensitive indicators of the climate of a region.
Glaciers are in the process of retreat in almost all the parts of the world due to global
warming. The same process of retreat is found in the valley’s largest glacier, Kolahoi. Thus,
it is of great significance to obtain the accurate information of changes in Kolahoi glacier
(34° 07′ to 34° 12′ N latitude; & 75° 16′ to 75° 23′ E longitude, Liddar valley, Kashmir
Himalayas). The study was carried out using Remote Sensing and GIS techniques and
thorough field observations were conducted to identify the geomorphologic features. The
area of the glacier receded from 13.57km² in 1963 to 10.69km² in 2005, registering a change
of 2.88km2at a rate of 0.068km2per year. The Crevasses developed in the ablation portion of
the Kolahoi Glacier and the formation of numerous caves at its snout position act as the
important indicators of its recession. The result of this retreat will prove disastrous for the
valley in many fields like drinking water, agriculture, horticulture, ground water, hydro power
capacity of the state, etc. Therefore, we need to make efforts to save this precious source of
water for the present as well as for future generations
