title: Removal of thorium (IV) ions from aqueous solution by a novel nanoporous ZnO: Isotherms, kinetic and thermodynamic studies.
abstract: The adsorption of thorium (IV) from aqueous solutions onto a novel nanoporous ZnO particles prepared by microwave assisted combustion was studied using batch methods under different experimental conditions. The effect of contact time, solution pH, initial concentration and temperature on adsorption process was studied. The ability of this material to remove Th (IV) from aqueous solution was characterises by Langmuir, Freunlinch and Temkin adsorption isotherms. The adsorption percent and distribution coefficient for nanoporous ZnO powders in optimum conditions were 97% ± 1.02; 8080 L kg(-1)for Th (IV), respectively. Based on the Langmuir model, the maximum adsorption capacity of nanoporous ZnO for Th (IV) was found to be 1500 g kg(-1). Thermodynamic parameters were determined and discussed. The results indicated that nanoporous ZnO was suitable as sorbent material for recovery and adsorption of Th (IV) ions from aqueous solutions. The radioactive Th (VI) in surface water, sea water and waste waters from technologies producing nuclear fuels, mining (uranium and thorium) and laboratories working with radioactive materials (uranium and thorium) can be removed with this nanoporous ZnO.
authors: Celal Bayar University, Education Faculty, Primary School Science Teaching, Demirci, Manisa, Turkey. Electronic address: u.h.kaynar@hotmail.com.
authors: Ümit H
authors: ÜH
authors: Kaynar
authors: Celal Bayar University, Department of Physics, Manisa, Turkey.
authors: Mehmet
authors: M
authors: Ayvacıklı
authors: Celal Bayar University, Department of Chemistry, Manisa, Turkey.
authors: Ümran
authors: Ü
authors: Hiçsönmez
authors: Celal Bayar University, Department of Physics, Manisa, Turkey.
authors: Sermin Çam
authors: SÇ
authors: Kaynar
mesh_terms: D000327:Adsorption; D052918:Environmental Restoration and Remediation / Q000295:instrumentation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D053768:Metal Nanoparticles / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D013910:Thorium / Q000737:chemistry*; D013997:Time Factors; D014875:Water Pollutants, Radioactive / Q000032:analysis*; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D014875:Water Pollutants, Radioactive; D013910:Thorium; D015034:Zinc Oxide
keywords: Adsorption; High capacity; Nanoporous ZnO; Thorium