title: Study of As(III) and As(V) Oxoanion Adsorption onto Single and Mixed Ferrite and Hausmannite Nanomaterials.
abstract: The removal of arsenic(III) and arsenic(V) from an aqueous solution through adsorption on to Fe3O4, MnFe2O4, 50% Mn substituted Fe3O4, 75% Mn substituted Fe3O4, and Mn3O4nanomaterials was investigated. Characterization of the nanomaterials using XRD showed only pure phases for Mn3O4, MnFe2O4, and Fe3O4. The 50% and 75% substituted nanomaterials were found to be mixtures of Mn3O4and Fe3O4. From batch studies the optimum binding pH of arsenic(III) and arsenic(V) to the nanomaterials was determined to be pH 3. The binding capacity for As(III) and As(VI) to the various nanomaterials was determined using Isotherm studies. The binding capacity of Fe3O4was determined to be 17.1 mg/g for arsenic(III) and 7.0 mg/g for arsenic(V). The substitution of 25% Mn into the Fe3O4lattice showed a slight increase in the binding capacity for As(III) and As(VI) to 23.8 mg/g and 7.9 mg/g, respectively. The 50% substituted showed the maximum binding capacity of 41.5 mg/g and 13.9 mg/g for arsenic(III) and arsenic(V). The 75% Mn substituted Fe3O4capacities were 16.7 mg/g for arsenic(III) and 8.2 mg/g for arsenic(V). The binding capacity of the Mn3O4was determined to be 13.5 mg/g for arsenic(III) and 7.5 mg/g for arsenic(V). In addition, interference studies on the effects of SO2-4, PO3-4, Cl-, and NO-3investigated. All the interferences had very minimal effects on the As(III) and As(V) binding never fell below 20% even in the presence of 1000 ppm interfering ions.
authors.affiliation: Department of Chemistry the University of Texas-Pan American 1201 W University Dr. Edinburg TX, 78539.
authors.forename: Sandra
authors.initials: S
authors.lastname: Garcia
authors.affiliation: Department of Chemistry the University of Texas-Pan American 1201 W University Dr. Edinburg TX, 78539.
authors.forename: Saima
authors.initials: S
authors.lastname: Sardar
authors.affiliation: Department of Chemistry the University of Texas-Pan American 1201 W University Dr. Edinburg TX, 78539.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Maldonado
authors.affiliation: Department of Chemistry the University of Texas-Pan American 1201 W University Dr. Edinburg TX, 78539.
authors.forename: Velia
authors.initials: V
authors.lastname: Garcia
authors.affiliation: Department of Chemistry the University of Texas-Pan American 1201 W University Dr. Edinburg TX, 78539.
authors.forename: C
authors.initials: C
authors.lastname: Tamez
authors.affiliation: Department of Chemistry the University of Texas-Pan American 1201 W University Dr. Edinburg TX, 78539.
authors.forename: J G
authors.initials: JG
authors.lastname: Parsons
references.citation: J Hazard Mater. 2012 May 30;217-218:439-46
references.pmid: 22494901
references.citation: J Hazard Mater. 2009 Nov 15;171(1-3):980-6
references.pmid: 19631458
references.citation: J Colloid Interface Sci. 2008 May 15;321(2):493-500
references.pmid: 18346752
references.citation: Chemosphere. 2003 Sep;52(9):1353-9
references.pmid: 12867164
references.citation: Water Res. 2008 Dec;42(19):4885-93
references.pmid: 18929386
references.citation: J Hazard Mater. 2010 Dec 15;184(1-3):832-842
references.pmid: 20875700
references.citation: Environ Sci Technol. 2001 Nov 15;35(22):4562-8
references.pmid: 11757617
references.citation: Bioresour Technol. 2009 Sep;100(18):4139-46
references.pmid: 19414249
references.citation: J Hazard Mater. 2007 Apr 2;142(1-2):1-53
references.pmid: 17324507
references.citation: Water Res. 2005 Dec;39(20):5212-20
references.pmid: 16290184
references.citation: Waste Manag. 2002;22(3):357-63
references.pmid: 11952183
references.citation: J Environ Manage. 2011 Dec;92(12):3011-22
references.pmid: 21871703
references.citation: J Colloid Interface Sci. 2004 Dec 1;280(1):62-7
references.pmid: 15476774
references.citation: Environ Sci Technol. 2006 Mar 1;40(5):1636-43
references.pmid: 16568781
references.citation: Water Res. 2006 Jan;40(2):364-72
references.pmid: 16352327
references.citation: Environ Sci Technol. 2001 Dec 15;35(24):4753-7
references.pmid: 11775149
references.citation: Biochimie. 2009 Oct;91(10):1229-37
references.pmid: 19567262
references.citation: Environ Sci Technol. 2012 Nov 6;46(21):11594-600
references.pmid: 23050871
references.citation: Chemosphere. 2006 Jul;64(5):730-41
references.pmid: 16405955
references.citation: Environ Sci Technol. 2004 Apr 15;38(8):2428-34
references.pmid: 15116850
references.citation: Water Res. 2011 Dec 1;45(19):6496-504
references.pmid: 22000059
references.citation: J Colloid Interface Sci. 2007 Jul 15;311(2):544-50
references.pmid: 17448489
references.citation: Am J Epidemiol. 1998 Jul 15;148(2):198-203
references.pmid: 9676702
references.citation: Environ Sci Technol. 2013 Jan 15;47(2):1009-16
references.pmid: 23252340