Experimental investigation of the chemical reduction of nitrate in water by MgO and Cu/Mg bimetallic particles in the absence of any pH- control mechanism
- Publisher:
- PSP
- Publication Type:
- Journal Article
- Citation:
- Fresenius Environmental Bulletin, 2011, 20 (9A), pp. :2475 - 2484
- Issue Date:
- 2011-01
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Batch experiments revealed that magnesium (Mg-O) and copper/magnesium (Cu/Mg) particles had the potential for being used in the removal of nitrate from aqueous solutions. This study suggested that the reductive denitrification of nitrate by Mg-o and Cu/Mg bimetals depended on a number of parameters including reductant dose, solution temperature, initial nitrate concentration and contact time. The values of the activation energy (E-a) of nitrate reduction over a temperature range of 5-60 degrees C were 20.39, 20.34, 12.77 and 12.13 kJ/mol for Mg-o, 0.1% Cu/Mg, 1% Cu/Mg and 5% Cu/Mg, respectively. The predominant by-product depended strongly on the initial pH of the solution and the reductant type. When the initial pH was 4, Mg-o produced more nitrite and ammonium than the Cu/Mg bimetals. The time required for the removal of 70% of NO3- from a 100 mg/L solution was about 80 min when the experiments were conducted using Mg-o particles and it was about 5 min when the reaction was conducted under the same conditions using bimetallic 1% Cu/Mg. Thus, bimetal Cu/Mg had a greater potential for being used as a reductant during the denitrification of water in comparison with Mg-o as far as the generation of toxic by-products is concerned.
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