Research on adsorption of diatomite to heavy metal ion Mn~(2+)

Using diatomite as an adsorbent,the effects of several factors,including adsorbent concentration,initial iron concentration,adsorbate-solution temperature,initial adsorbate-solution pH value and adsorption time on diatomite adsorption to the Mn2+ in the simulated waste-water were examined in the experiment by static adsorption tentative.The results indicate that the maximum diatomite adsorption capacity to Mn2+ was 4.0486 mg·g-1,so the diatomite adsorbent can be used for the removal of the Mn2+ iron.Further,under the conditions of temperature lower than 50℃ and the pH value less than 6,the performance of diatomite adsorption to Mn2+ could be improved with the increases of adsorbent dosage,initial Mn2+ concentration and adsorption time.The findings also demonstrate that,compared to the Langmuir adsorption isotherms,Freundlich adsorption isotherm can better describe the adsorption process of diatomite to Mn2+,and that adsorption kinetic of diatomite to Mn2+ accorded with second-order equation.