title: Factorial experimental design application in modification of volcanic ash as a natural adsorbent with Fenton process for arsenic removal.
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 Fe(2+)/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 Fe(2+)/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)/H2O2 = 0.06 and 30 min of contact time (39 microg As(III) per mg FMVA), whereas the maximum As(V) adsorption was obtained under the conditions of pH 5, Fe(+2)/H2O2 = 0.06 and 30 min of contact time (41 microg As(V) per mg FMVA).
authors.affiliation: Department of Environmental Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
authors.forename: Neamat
authors.initials: N
authors.lastname: Jaafarzadeh
authors.forename: Hoda
authors.initials: H
authors.lastname: Amiri
authors.forename: Mehdi
authors.initials: M
authors.lastname: Ahmadi
mesh_terms: D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D004785:Environmental Pollutants / Q000302:isolation & purification*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D018707:Volcanic Eruptions
chemical_list: D004785:Environmental Pollutants; C045076:Fenton's reagent; D006861:Hydrogen Peroxide; D007501:Iron; D001151:Arsenic