Article ID Journal Published Year Pages File Type
9680931 Desalination 2005 7 Pages PDF
Abstract
The objective of this work is to study the removal of Ca, Mg, Na and K from water using carbon-based materials obtained from sewage sludges pyrolysis. For this reason, carbon-based materials were prepared at two different pyrolysis temperatures: 450 (SL-450) and 650°C (SL-650). Also, a third material was prepared washing SL-650 with HNO3:H20 1:1 (vol). These carbon-based material were mixed with solutions with different concentrations of NaCl, KCl, CaCl2 and MgCl2. Results showed that percentages of metal removal followed next sequence Mg2+ > Ca2+ > Na+ ∼ K+ and that the percentage of removal increased with the pH of the initial solution. Similar percentages of ions removal were obtained by SL-450 and SL-650 increasing the percentage of metal removal when the SL-650 washed with acid was used. Metals lixiviation from carbon-based materials decreases with the increment of the pyrolysis temperature. Nevertheless, the properties of raw material and consequently, of carbon-based materials can have a great influence in the adsorption properties of the final carbonaceous material, and so, in the removal of metals from water.
Related Topics
Physical Sciences and Engineering Chemical Engineering Filtration and Separation
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