Abstract
This paper describes an experimental design technique for the modification of volcanic ash with Fenton reagent (FMVA) to be used as a natural adsorbent in the removal of As(III) and As(V) from aqueous solution. The influence of pH, contact time and Fe2+/H2O2 on arsenic removal by the modified volcanic ash was investigated. It was observed that the arsenic removal efficiency was influenced by two of these parameters. The Fe2+/H2O2 ratio is an important factor that affects both As(III) and As(V) adsorption (P=0.000). The pH affects As(V) adsorption (P=0.003) more significantly than As(III) adsorption (P=0.02). It was observed that the maximum As(III) adsorption by the FMVA was obtained at pH 2, Fe+2/H 2O 2=0.06 and 30 min of contact time (39 μg As(III) per mg FMVA), whereas the maximum As(V) adsorption was obtained under the conditions of pH 5, Fe+2/H 2O 2=0.06 and 30 min of contact time (41 μg As(V) per mg FMVA).
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