Abstract:
<p align="justify"> The adsorption of mercury, arsine, hydrocyanic acid, and hydrogen sulfide on amorphous chemical manganese dioxide (CMD) and electrolytic manganese dioxide (EMD) has been investigated. Variables such as agitation time, pH, temperature, mass of adsorbent, and concentration of adsorbate were studied. The adsorption process obeys a Freundlich type isotherm over the concentration range investigated. Wads of Lujfa cylindrica Roem were used as substrate for CMD production. For gaseous substances, this amorphous material showed better sorption capacity than EMD. </p>