<p><b>In
this paper, the deficiencies and cause of previous adsorption kinetic models
were revealed, new adsorption rate equation has been proposed and its validities
were verified by kinetic analysis of various experimental data.</b> <b>This
work is a new view on the adsorption kinetics rather than a comment on the
previous adsorption papers.</b></p>
This paper recommends maize stalk as a cheap natural ion exchanger. Ion exchange equilibrium was studied using thermodynamic and kinetic models. The results showed a high selectivity towards cationic species of antimony (III), molybdenum (VI), lead (II) and arsenium (III). Waste waters and sediments from tailing ponds samples were analysed.