title: A sorption kinetics model for arsenic adsorption to magnetite nanoparticles.
abstract: BACKGROUND
  Arsenic is a well known water contaminant that causes toxicological and carcinogenic effects. In this work magnetite nanoparticles were examined as possible arsenic sorbents. The objective of this work was to develop a sorption kinetics model, which could be used to predict the amount of arsenic adsorbed by magnetite nanoparticles in the presence of naturally occurring species using a first-order rate equation, modified to include adsorption, described by a Langmuir isotherm.
  
  
  CONCLUSIONS
  Arsenate and arsenite adsorption to magnetite nanoparticles was studied, including the effect of naturally occurring species (sulfate, silica, calcium magnesium, dissolved organic matter, bicarbonate, iron, and phosphate) on adsorption.
  
  
  CONCLUSIONS
  The model accurately predicts adsorption to magnetite nanoparticles used in a batch process to remove arsenic from spiked Houston, TX tap water, and contaminated Brownsville, TX groundwater.
authors.affiliation: University of Texas-San Antonio, One UTSA Circle, San Antonio, TX 78249, USA. heather.shipley@utsa.edu
authors.forename: Heather J
authors.initials: HJ
authors.lastname: Shipley
authors.forename: Sujin
authors.initials: S
authors.lastname: Yean
authors.forename: Amy T
authors.initials: AT
authors.lastname: Kan
authors.forename: Mason B
authors.initials: MB
authors.lastname: Tomson
mesh_terms: D000327:Adsorption; D001149:Arsenates / Q000032:analysis / Q000737:chemistry; D001151:Arsenic / Q000032:analysis / Q000737:chemistry*; D018053:Arsenites / Q000032:analysis / Q000737:chemistry; D001639:Bicarbonates / Q000032:analysis / Q000737:chemistry; D002118:Calcium / Q000032:analysis / Q000737:chemistry; D002947:Cities; D052203:Ferrosoferric Oxide / Q000032:analysis / Q000737:chemistry*; D007501:Iron / Q000032:analysis / Q000737:chemistry; D007700:Kinetics; D008274:Magnesium / Q000032:analysis / Q000737:chemistry; D008956:Models, Chemical; D009930:Organic Chemicals / Q000032:analysis / Q000737:chemistry; D010710:Phosphates / Q000032:analysis / Q000737:chemistry; D012822:Silicon Dioxide / Q000032:analysis / Q000737:chemistry; D013431:Sulfates / Q000032:analysis / Q000737:chemistry; D013781:Texas; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D001149:Arsenates; D018053:Arsenites; D001639:Bicarbonates; D009930:Organic Chemicals; D010710:Phosphates; D013431:Sulfates; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide; D007501:Iron; D008274:Magnesium; C015001:arsenite; D001151:Arsenic; D002118:Calcium; D052203:Ferrosoferric Oxide