108 3rd icyc 2010 universiti sains malaysia env p13

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Unformatted text preview: generative mode was used in the recovery of lead. This operation is attractive in reducing operating costs due to the spontaneous chemical reaction that take place in the reactor. A batch cell using three-dimensional cathodes namely porous graphite or reticulated vitreous carbon were coupled with a zinc anode. The performance of the electrogenerative system was evaluated based on various parameters: initial lead(II) nitrate concentration, choice of cathode material used, supporting electrolyte concentration and acidity of anolyte and catholyte solutions. More than 90 % lead was recovered within 3 h of operation by using porous graphite. The recovery of lead was 100 % after 1 hour of operation using a reticulated vitreous carbon as a cathode. X Ray diffraction analysis and scanning electron microscopy were used to visualize the lead deposits. ENV-P14 ELECTROGENERATIVE REMOVAL OF COBALT FROM SULPHATE SOLUTIONS USING A FLOW-BY REACTOR Tan Wan Xin and Norita Mohamed School of Chemical Sciences, Universiti Sains Malaysia, 11800 Pulau Pinang, Malaysia E-mail:[email protected] A flow-by reactor which was operated in a batch-recycle mode was used to study the removal of cobalt from sulphate solutions via an electrogenerative process. Reticulated vitreous carbon, a threedimensional electrode was used as the cathode material. The effect of initial cobalt(II) concentrations of -1 10, 100 and 500 mg L and different electrolyte flow rates on cobalt removal were investigated. Results -1 -1 obtained showed that more than 96 % (from 10 mg L ) and 98 % (from 100 mg L ) of cobalt were -1 reduced on the cathode after 4 h of operation. For initial cobalt(II) concentration of 500 mg L , more than 98 % of cobalt was removed after 7 h of operation at all the electrolyte flow rates. The removal of cobalt was dependent on the initial cobalt(II) concentration but varying the electrolytes flow rates did not greatly affect the percentage of cobalt removal. 109 23rd-25th June 2010 3rd ICYC 2010 Universiti Sains Malaysia ENV-P15 CYCLODEXTRIN POLYURETHANE A...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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