i want to reduce the final pH of the solution after the removal of heavy metals by chemical precipitation, provided this increase have not any other inconvenience in the effeciency or solibility of precipitate .
After precipitation of the heavy metal ions separate the crystals then add a little acidic solution
Dear Mohammed... The removal of heavy metals, HM, at high pH values is purely a chemical process. This is related to the formation of insoluble hydroxides of most HM. To reduce the final pH, the work must be accompanied by adsorption onto certain adsorbents. Many adsorbents are available now on lab and pilot scale. You may use activated carbon, clay minerals and some nano products. The process will be entirely adsorption that may be performed even at neutral medium. the following link may be helpful
https://www.scirp.org/journal/PaperInformation.aspx?PaperID=54822
...Good luck
In my experience, adsorption is the best technique.
To increase adsorption capacity of your adsorbing material you can play little bit with temperature..... the good point in adsorption is that you can regenerate you material for re use.
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