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AbstractAbstract
[en] It is well known that arsenic is a hazardous element for the environment. It can originate either from anthropogenic activities (pesticides, wood preservatives, mining activities, and electronic industry) or from natural erosion of arsenic containing rocks. Arsenic is highly toxic and is a carcinogenic element that exists predominantly in the form of oxyanions in the aquatic environment and has become a worldwide environmental issue. Thus, arsenic removal from industrial effluents, groundwater, and even drinking water systems has become very important. At present, the WHO guideline value, the EC maximum admissible concentration, and the USEPA limit for As in drinking water is 10 μg/L. Various treatment processes such as precipitation, adsorption onto activated alumina, reverse osmosis and ion exchange have been reported in the literature to remove arsenic from aquatic environment. Recently, polymer ligand exchanger (PLE) adsorbents have been found as one of the most promising materials for arsenic removal due to their high adsorption capacity and selectivity at low concentrations. The objective of this research was to develop a novel PLE adsorbent by radiation-induced graft polymerization so as to achieve very low level of arsenic in aqueous solutions. For this purpose, GMA was grafted onto polypropylene coated polyethylene nonwoven fabrics in emulsion system by using radiation induced graft polymerization. For the preparation of GMA grafted fabric, the trunk PE/PP nonwoven fabric was irradiated by electron beam. After irradiation process, GMA was grafted onto irradiated nonwoven fabric under nitrogen atmosphere. In order to prepare fibrous PLE adsorbent for the removal of arsenic, grafted GMA was first modified with dipicolylamine. Maximum modification was obtained in 15 % (w/w) dipicolylamine solution. Then, PLE adsorbent was loaded with Cu2+ ions. High copper ion loading was observed for PLE fibers. Column mode adsorption studies were conducted with copper loaded PLE adsorbents at different arsenic concentrations (1-50 ppm) and pH to examine the removal of arsenic (V) in aqueous solutions. The breakthrough point of As (V) was found to be 8000 bed volumes for 1 ppm As (V) solution
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Hacettepe University, (Turkey); Turkish Atomic Energy Authority, (Turkey); The Scientific and Technological Research Council of Turkey, (Turkey); International Atomic Energy Agency , (Austria); CEA-Saclay, (France); CEA-Saclay Drecam, (France); ANKAmall Shopping Center, (Turkey); Ion Beam Applications Industrial, (Belgium); 205 p; 2006; p. 61; IRAP 2006: 7. International Symposium on Ionizing Radiation and Polymers; Antalya (Turkey); 23-28 Sep 2006; Also available from the author by e-mail: kavakli@yahoo.com
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