title: Removal of cerium ions from aqueous solution by hydrous ferric oxide--a radiotracer study.
abstract: Radiotracer technique has been used to study the removal behavior of Ce (III) ions from aqueous solutions by synthesized and well characterized hydrous ferric oxide (HFO). Adsorptive concentration (10(-4)-10(-8) mol dm(-3)), pH (ca 4.0-10.0) and temperature (303-333 K) were examined for assessing optimal conditions for removal of these ions. The uptake of Ce (III) ions, which fitted well for Freundlich and D-R isotherms, increased with increase in the temperature and no significant desorption took place in the studied temperature range. The presence of some anions/cations affected the uptake of metal ion markedly. Irradiation of hydrous ferric oxide and tungsten oxide by using a 11.1×10(9) Bq (Ra-Be) neutron source having a neutron flux of 3.9×10(6) cm(-2) s(-1) with associated γ-dose rate of 1.72 Gy/h did not influence the extent of adsorption of Ce (III) significantly.
authors.affiliation: Department of Chemistry, GITAM Institute of Technology, GITAM University, Visakhapatnam 530045, India. somshankarbhu@yahoo.co.in
authors.forename: Som Shankar
authors.initials: SS
authors.lastname: Dubey
authors.forename: Battula Sreenivasa
authors.initials: BS
authors.lastname: Rao
mesh_terms: D000327:Adsorption; D000465:Algorithms; D002412:Cations / Q000737:chemistry; D002563:Cerium / Q000302:isolation & purification*; D002565:Cerium Radioisotopes / Q000737:chemistry; D005290:Ferric Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D009792:Oceans and Seas; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013816:Thermodynamics; D014867:Water; D014875:Water Pollutants, Radioactive / Q000032:analysis; D014961:X-Ray Diffraction
chemical_list: D002412:Cations; D002565:Cerium Radioisotopes; D005290:Ferric Compounds; D012996:Solutions; D014875:Water Pollutants, Radioactive; D014867:Water; C000499:ferric oxide; D002563:Cerium