title: Removal of metal ions from wastewater using EB irradiation in combination with HA/TiO₂/UV treatment.
abstract: The electron beam (EB) irradiation technology was applied for removal of Cu(2+), Sr(2+), and Co(2+) ions from wastewater. The aim of this study is to achieve an efficient treatment process of wastewater using EB and introducing a combination of humic acid (HA) as a natural organic polymer and ultraviolet irradiation of a TiO2 (TiO2/UV), as a suspended catalyst in the treatment of wastewater solutions (TiO2/UV+HA). The experimental results showed that the percentage removal of Cu(2+), Sr(2+), and Co(2+)ions was 41%, 87% and 75% respectively, at 125 kGy. In the presence of TiO2 photocatalyst and exposure of the investigated wastewater to ultraviolet rays before irradiation by the EB the percentage removal of Cu(2+) ions became 51%, while the percentage removal of both Sr(2+) and Co(2+) ions was slightly improved; was 87% and 75%, respectively at the same EB dose. On the other hand, by introducing the combination of TiO2/UV+HA, only an irradiation dose of about 50kGy led to removal of Cu(2+), Sr(2+), and Co(2+) completely from the wastewater. Mechanisms of interactions between HA and Cu(2+), Co(2+) and Sr(2+) metal ions were suggested and discussed.
authors.affiliation: Hot Laboratory and Waste Management Center (HLWMC), Atomic Energy Authority, P.O. Box 13758, Inshas, Cairo, Egypt. Electronic address: aazaki7@yahoo.com.
authors.forename: A A
authors.initials: AA
authors.lastname: Zaki
authors.affiliation: Department of Polymer, National Center for Radiation Research and Technology(NCRRT), Atomic Energy Authority, Nasr City, P.O. Box 19, Cairo, Egypt.
authors.forename: Naima A
authors.initials: NA
authors.lastname: El-Gendy
mesh_terms: D000327:Adsorption; D004583:Electrons; D006812:Humic Substances; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D008670:Metals; D014025:Titanium; D062065:Wastewater; D014874:Water Pollutants, Chemical; C009495:titanium dioxide
keywords: Electron beam; Humic acid; Mechanism; Photocatalysis; Removal