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

By Yogesh C. Sharma

Water toxins is subject of giant and customary obstacle during the global.  This publication offers the consequences and information from examine and adsorption experiments performed at the removing of nickel and chromium (as good as different metals) from aqueous ideas utilizing converted silica sand.

Content:
Chapter 1 advent (pages 1–38):
Chapter 2 fabric and techniques (pages 39–43):
Chapter three effects and Discussions (pages 45–90):
Chapter four Conclusions (pages 91–101):

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

Sample text

The maximum percentage removal of Cr (VI) is obtained at pH 1. The dominant form of Cr (VI) is HCrO~4 and the surface of adsorbent is charged positively at lower pH values. 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.

4 Instrumentation The instruments used during the experiments are as follows, along with a brief detail of their manufacturer: Instrument Model No. and Manufacturer Water bath shaker Narang Scientific Works Pvt. Ltd. (NSW-133) Research centrifuge REMI (R 24) (Continued) MATERIAL AND METHODS 41 (Continued) Instrument Model No. 1 Adsorption Experiments After development of the two nano-adsorbents, effects of various important parameters on the removal of selected metallic species by nano-adsorbents were studied.

If the adsorbate molecules do not have a permanent dipole, they can acquire an induced dipole when placed in an electrostatic field near an ionic solid surface. Unlike van der Waals forces, the electrostatic forces can be repulsive as well as attractive. 10 Adsorption Theories Positive adsorption in a solid-liquid system results in the removal of solute from solution and their concentration at the surface of the solid, until such time as the concentration of the solute remaining in the solution is in a dynamic equilibrium with that at the surface.

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