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Precipitating barium sulphate by changing the pH
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Alan Jia
Precipitating barium sulphate by changing the pH
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Compare the reaction Bariumhydroxide with CO2 and SO2. In both cases you will have the main atom carbon or sulphur and 3 Oxygen. To get Sulfate you need on oxygen more. This can only obtained by oxidation. It is a redox reaction. To change pH will not any effect.
Thank you chenbeier. If I wanted to use say hydrogen peroxide to oxidise the ##BaSO_{3}## to ##BaSO_{4}## on the electrode, what do you think would be the best way to do this? i.e. could it be done during the electrochemical process? Or would it only be done after the electrochemical reactions on the solid ##BaSO_{3}##?
Also I did look for sulphur trioxide speciation information and couldn't find anything, so I assume sulphur trioxide does not change species with pH in solution?
Compare the reaction Bariumhydroxide with CO2 and SO2. In both cases you will have the main atom carbon or sulphur and 3 Oxygen. To get Sulfate you need on oxygen more. This can only obtained by oxidation. It is a redox reaction. To change pH will not any effect.
Thank you chenbeier. If I wanted to use say hydrogen peroxide to oxidise the ##BaSO_{3}## to ##BaSO_{4}## on the electrode, what do you think would be the best way to do this? i.e. could it be done during the electrochemical process? Or would it only be done after the electrochemical reactions on the solid ##BaSO_{3}##?
Also I did look for sulphur trioxide speciation information and couldn't find anything, so I assume sulphur trioxide does not change species with pH in solution?
Compare the reaction Bariumhydroxide with CO2 and SO2. In both cases you will have the main atom carbon or sulphur and 3 Oxygen. To get Sulfate you need on oxygen more. This can only obtained by oxidation. It is a redox reaction. To change pH will not any effect.
Compare the reaction Bariumhydroxide with CO2 and SO2. In both cases you will have the main atom carbon or sulphur and 3 Oxygen. To get Sulfate you need on oxygen more. This can only obtained by oxidation. It is a redox reaction. To change pH will not any effect.
Probably add some Peroxide for oxidation to convert sulfite to sulfate.
Hmm interesting, yes, if I get barium sulfite i could just pour some hydrogen peroxide on it. Thanks.
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Looks like you might be mistaking sulfite and sulfate.
Where? Wouldn't it depend on the pH? But even if I control the pH to control the sulphate species in solution I'm still not going to get ##BaSO_{4}## from the OH ions. Unlike the carbonate reaction, for sulphate I lose an oxgen when the pH decreases, so at the end I'm going to get ##BaSO_{3}## not ##BaSO_{4}##. Unless I've gone wrong somewhere or there are different species in solution. I would have to use sulphur trioxide to get my ##BaSO_{4}## back at the end, but does it speciate like the dioxide?
Probably add some Peroxide for oxidation to convert sulfite to sulfate.
Hmm interesting, yes, if I get barium sulfite i could just pour some hydrogen peroxide on it. Thanks.
Quote from:
Looks like you might be mistaking sulfite and sulfate.
Where? Wouldn't it depend on the pH? But even if I control the pH to control the sulphate species in solution I'm still not going to get ##BaSO_{4}## from the OH ions. Unlike the carbonate reaction, for sulphate I lose an oxgen when the pH decreases, so at the end I'm going to get ##BaSO_{3}## not ##BaSO_{4}##. Unless I've gone wrong somewhere or there are different species in solution. I would have to use sulphur trioxide to get my ##BaSO_{4}## back at the end, but does it speciate like the dioxide?
Thank you chenbeier. If I wanted to use say hydrogen peroxide to oxidise the ##BaSO_{3}## to ##BaSO_{4}## on the electrode, what do you think would be the best way to do this? i.e. could it be done during the electrochemical process? Or would it only be done after the electrochemical reactions on the solid ##BaSO_{3}##?
Also I did look for sulphur trioxide speciation information and couldn't find anything, so I assume sulphur trioxide does not change species with pH in solution?
Thank you chenbeier. If I wanted to use say hydrogen peroxide to oxidise the ##BaSO_{3}## to ##BaSO_{4}## on the electrode, what do you think would be the best way to do this? i.e. could it be done during the electrochemical process? Or would it only be done after the electrochemical reactions on the solid ##BaSO_{3}##?
Also I did look for sulphur trioxide speciation information and couldn't find anything, so I assume sulphur trioxide does not change species with pH in solution?
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In both cases you will have the main atom carbon or sulphur and 3 Oxygen. To get Sulfate you need on oxygen more. This can only obtained by oxidation. It is a redox reaction.
To change pH will not any effect.
In both cases you will have the main atom carbon or sulphur and 3 Oxygen. To get Sulfate you need on oxygen more. This can only obtained by oxidation. It is a redox reaction.
To change pH will not any effect.
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Elektrode no need.
Elektrode no need.
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Hmm interesting, yes, if I get barium sulfite i could just pour some hydrogen peroxide on it. Thanks.
Quote from:
Where? Wouldn't it depend on the pH? But even if I control the pH to control the sulphate species in solution I'm still not going to get ##BaSO_{4}## from the OH ions. Unlike the carbonate reaction, for sulphate I lose an oxgen when the pH decreases, so at the end I'm going to get ##BaSO_{3}## not ##BaSO_{4}##. Unless I've gone wrong somewhere or there are different species in solution. I would have to use sulphur trioxide to get my ##BaSO_{4}## back at the end, but does it speciate like the dioxide?
Hmm interesting, yes, if I get barium sulfite i could just pour some hydrogen peroxide on it. Thanks.
Quote from:
Where? Wouldn't it depend on the pH? But even if I control the pH to control the sulphate species in solution I'm still not going to get ##BaSO_{4}## from the OH ions. Unlike the carbonate reaction, for sulphate I lose an oxgen when the pH decreases, so at the end I'm going to get ##BaSO_{3}## not ##BaSO_{4}##. Unless I've gone wrong somewhere or there are different species in solution. I would have to use sulphur trioxide to get my ##BaSO_{4}## back at the end, but does it speciate like the dioxide?
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