title: Comparison of surface functional groups and metal uptake efficiency of rice husk harvested from different climatic zones.
abstract: Rice husk (RH) is a very effective natural adsorbent for fast removal of heavy metal cations from water solutions. Application of RH for removal of some heavy metal ions, such as Ni, Zn, Mn, Co, Cu, Pb and Cd from water solutions has been studied and different maximum adsorption capacities and a variety of optimized conditions were reported in the literature. In this work, the efficiency of RH harvested from different climatic regions was studied. For this proposal, different RH samples were collected from three different climatic regions of Iran (nominated as RH1 to RH3); their removal efficiencies of heavy metal cations of Ni(2+), Cu(2+) and Cd(2+) were investigated and compared. The adsorption data at optimum conditions could be assessed well by both Langmuir and Freundlich models. Statistical analysis of the results of adsorption isotherms showed that different RH samples have different efficiencies in uptake of these heavy metal ions. The RH samples were characterized using Fourier transform infrared spectroscopy and Boehm titration, which indicated that amounts of functional groups differed between RHs that are grown in different climatic conditions.
authors.affiliation: Department of Science, Faculty of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
authors.forename: Amir Hossein
authors.initials: AH
authors.lastname: Matin
authors.forename: Shokooh Sadat
authors.initials: SS
authors.lastname: Khaloo
authors.forename: Abbas
authors.initials: A
authors.lastname: Akbarzadeh
authors.forename: Mohammad
authors.initials: M
authors.lastname: Riahi
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry; D002980:Climate; D003300:Copper / Q000737:chemistry; D007492:Iran; D019216:Metals, Heavy / Q000737:chemistry*; D009532:Nickel / Q000737:chemistry; D012275:Oryza / Q000737:chemistry*; D018515:Plant Leaves / Q000378:metabolism*; D017550:Spectroscopy, Fourier Transform Infrared; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D002104:Cadmium; D003300:Copper; D009532:Nickel