Recently, I synthesized silicon/carbon material by magnesiothermic reduction of silica/carbon precursor. I found that MgO was hard to remove. I used 2M, 5M 12M HCl, and stirred overnight with different temperature( 55, 80, 120℃). Also, I washed my sample for many times but it still can not work. MgO peaks in XRD pattern are still very high.
I want to know how can I remove MgO in magnesiothermic reduction.
One way to remove MgO is to use a chelating agent such as EDTA (ethylenediaminetetraacetic acid). EDTA binds to metal ions such as Mg2+ and forms a complex that can be removed from the solution. You can add EDTA to your solution and stir for a few hours to allow the EDTA to bind to the Mg2+ ions. After stirring, you can filter the solution to remove the EDTA-Mg2+ complex. This should help reduce the amount of MgO in your sample.
EDTA is highly soluble in water. To remove the complex and EDTA, you can use a method called dialysis. This involves placing the solution in a semi-permeable membrane, such as a dialysis bag, and allowing the water to pass through the membrane while the complex and EDTA remain trapped inside. Once the water has passed through, the complex and EDTA can be removed from the bag.
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