By Yogesh C. Sharma

ISBN-10: 1118137159

ISBN-13: 9781118137154

Water pollutants is subject of huge and customary challenge through the international.  This e-book offers the implications and information from examine and adsorption experiments conducted at the removing of nickel and chromium (as good as different metals) from aqueous recommendations utilizing transformed silica sand.

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

Example text

9 respectively. 2 Effect of Contact Time and Initial Concentration of Cr (VI) and Ni (II) During the uptake of pollutants from wastewater by the adsorption process, the following two factors play important roles: i. initial concentration of the adsorbate in the solution, and ii. time of contact between the adsorbate and adsorbent phases. A rapid transport of adsorbate species from the bulk to the surface of the adsorbent cuts short the equilibrium period. The time taken to attain equilibrium is important in order to predict the efficiency and feasibility of an adsorbent for its use in water pollution control.

20gm of silica sand (modified as well as raw) was added. After these samples were left for 48 hours, the final pH of the solutions was measured. Then graphs were plotted between pH final versus pH initial. The point of intersection of these two curves has been recorded as pHzpc of raw and modified silica sand. 9 respectively. 2 Effect of Contact Time and Initial Concentration of Cr (VI) and Ni (II) During the uptake of pollutants from wastewater by the adsorption process, the following two factors play important roles: i.

It is found from the kinetic studies that the adsorption rate of Cr (VI) is faster for the initial 250 min and then it decreases in the later part of adsorption. The equilibrium time for Cr (VI) adsorption on sawdust is obtained as 1050 min. The equilibrium data are best fitted with the Langmuir isotherm model which confirms the monolayer adsorption of Cr (VI) onto the sawdust. 52 m g / g , which is a comparatively good adsorption capacity. The saturated adsorption is regenerated by an acid and base treatment.

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