What is the best way to wash residual potassium carbonate out of chemically activated carbon? In the literature, washing is mentioned, yet most don't explain how.
Dear Ayushi Jaiswal thank you for your interesting technical question. According to the research article cited below, hot water is best to remove residual K2CO3 from your activated carbon. In this paper it is stated: "After carbonization, the sample was cooled down under nitrogen (N2) flow and was washed sequentially several times with hot water, and finally with cold distilled water to remove residual chemicals. Then the sample was dried at 110°C."
Preparation and characterization of activated carbon from palm shell by chemical activation with K2CO3
Article Preparation and Characterisation of Activated Carbon From Pa...
Also please have a look at the following relevant article:
Chars from gasification of coal and pine activated with K2CO3: Acetaminophen and caffeine adsorption from aqueous solutions
Article Chars from gasification of coal and pine activated with K2CO...
In this paper "After cooling, under N2 flow, the samples were washed with distilled water up to pH 7 and dried at 100 °C."
You might follow the pH trend to decide when the washing is sufficiently complete.
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