Adsorption of arsenite on synthetic composite adsorbent with Mg-Al-La-Ce oxides

A novel composite adsorbent with Mg, Al, La and Ce oxides was synthesized and used for the removal of arsenite from water solution. The adsorption behavior of arsenite followed the Langmuir adsorption isotherm with a maximum adsorption capacity of 29.7mg/g. The kinetics study showed that anion adsorption process was fast and apparently attained a steady state in 8h. The effect of different pH and coexisting ions have been investigated. The results showed that the solution pH has no obvious effect on the adsorption efficiency in the pH range of 3~10. No significant effects were found on the adsorption of arsenite by addition of the coexisting ions including Cl^-, SO₄^2- and NO₃^-, but not the anion of PO₄^3-.