Fig. 7: Mechanism for the regeneration of HIAO/225H material.

a The material after the adsorption process was regenerated with NH4OH solution. b The material after the adsorption process was regenerated with HCl and NH4OH solution.
a The material after the adsorption process was regenerated with NH4OH solution. b The material after the adsorption process was regenerated with HCl and NH4OH solution.