Read e-book online A Guide to the Economic Removal of Metals from Aqueous PDF

By Yogesh C. Sharma

ISBN-10: 1118137159

ISBN-13: 9781118137154

Water toxins is subject of significant and customary challenge during the international.  This publication provides the consequences and knowledge from examine and adsorption experiments performed at the removing of nickel and chromium (as good as different metals) from aqueous ideas utilizing transformed silica sand.

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Extra info for A Guide to the Economic Removal of Metals from Aqueous Solutions

Example text

The tendency of a particular solute to get adsorbed is determined by the difference in the adsorption potential between the solute and the solvent. When the solute-solvent affinity is large, the ability of the adsorbent to adsorb solute is usually limited. In general, the lower the affinity of the adsorbent for the solute, the higher will be the adsorption capacity. Adsorbents such as activated carbons and polymeric adsorbents, have high adsorption capacities in water because a low adsorption potential energy is needed on the part of an adsorbate to displace water from the surface of these adsorbents.

The chemical compositions are analyzed by EDS. Before analysis, the samples were coated with platinum in order to make them conductive. 4 shows the SEM micrographs of the raw silica sand at 100 times magnification, and unveils its rough surface. 5 shows the SEM micrographs of the raw silica sand at 5000 times magnification. 5 that the silica sand has a large number of porous structures because of fine crystals that are staggered in three-dimensional spaces. The surface is in a clean state which may ultimately increase the adsorption capacity of Cr (VI) on the silica sand.

Batch mode experiments were conducted to study the effects of adsorbent dose, contact time, pH, temperature, and initial concentration of Cr (VI). Results showed that the adsorption of Cr (VI) depended significantly on the pH and temperature. Equilibrium studies showed that Cr (VI) had a high affinity for AA at pH 4 and AC at pH 2. For AA, maximum adsorption INTRODUCTION 23 was found at 25°C/ indicating exothermic adsorption, while for AC, maximum adsorption was at 40°C. C. Sharma et al. [59]. 0 x 10~2M NaC104 ionic strength, and 100 rpm.

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A Guide to the Economic Removal of Metals from Aqueous Solutions by Yogesh C. Sharma

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