Remove as (III) from Aqueous Solution by Powder Mg(OH)2.

Abstract: Power Mg(OH)₂ was used to remove As(III) from arsenic-bearing wastewater. Results showed that Mg(OH)₂ had strong adsorptive property on As(III) ions with its adsorption capacity of 4.04mg/L; Mg(OH)₂ adsorption on As(III) fit well with Langmuir Isotherm equation; As(III) removal rate increased with vibration time and input quantity of adsorbents while decreased as pH increased and effects were obvious; temperature had little affection on arsenic adsorption; As(III) removal rate can exceeded 99% when reaching equilibrium under condition As(III) concentration of 20mg/L, Mg(OH)₂ input quantity of 2g/L and pH of 3; Mg(OH)₂ adsorption was fast and can reach equilibrium in 60min. [Copyright &y& Elsevier]