New adsorbents were developed for removal of As(III) and As(V) ions from drinking water. Porous support materials were granulated from aluminium oxide, titanium dioxide and their mixtures, respectively, then iron(III) hydroxide was freshly precipitated onto the surface of the particles. The adsorption behaviour of the different adsorbents was investigated in static and dynamic experiments. Experimental results were compared to the Langmuir, and the Freundlich isotherms. Based on the results of the static experiments it was found that the adsorbents coated with amorphous iron(III) hydroxide proved superior in all cases for removal of both As(III) and As(V) ions. The adsorption of As(III) ions onto Al 2O 3 and Al 2O 3 + Fe(OH) 3 adsorbents can be characterized by the Freundlich equation while adsorption of As(V) ions onto the TiO 2 and 80% TiO 2 + 20% Al 2O 3 adsorbents was determined as a pure monomolecular equilibrium adsorption fitted to the Langmuir isotherm. Changing the initial pH of the solution from 6,0 to 8,5, adsorption of As(III) ions increased and that of As(V) decreased by increasing the pH of the solution.
ASJC Scopus subject areas
- Environmental Engineering