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4-vinyl pyridine (4-VP) based hydrogels with 2-hydroxyethylmetacrylate (HEMA) and magnetic composites were prepared and tested for use in the removal of UO(2)(2+) and Th(4+) ions from aqueous environments. It was found that the absorption of these metal ions from aqueous environments decreased with an increase in the amount of HEMA contained within p(4-VP-co-HEMA) hydrogels between 0.498?mmol for pure p(4-VP) and 0.027?mmol for pure p(HEMA). The characterization of the hydrogels was determined by swelling experiments, FT-IR and thermal analysis. The effects of initial metal ion concentration, hydrogel amount and the temperature of the medium on absorption of the ions were investigated. Langmuir and Freundlich isotherms were constructed for the absorption of UO(2)(2+) and Th(4+). Both isotherms demonstrated that these metal ions complied with monolayer absorption kinetics. 相似文献
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Lignite powered electric generation plants result in increasing environmental problems associated with gaseous emissions and
the disposal of ash residues. Especially, low quality coals with high ash content cause enormous quantities of both gaseous
and solid fly ash emissions. The main problem is related to the disposal of fly ash, which, in many cases, contains heavy
metals. It is known that toxic trace metals may leach when fly ash is in contact with water. In this study, fly ash samples
obtained from the thermal power plant in the town of Can in Turkey were investigated for leachability of metals under different
acidic and temperature conditions. The experimental results show that a decrease in pH of the leachant favors the extraction
of metal ions from fly ash. A significant increase in the extraction of arsenic, cadmium, chromium, zinc, lead, mercury, and
selenium ions from the ash is attributed to the instability of the mineral phases. These heavy metals concentrations increase
with respect to increasing acidic conditions and temperature. Peak concentrations, in general, were found at around 30°C. 相似文献
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Onder Alper Kıvanç Mehmet Rıza Durmuş Seçil Ilgin Pinar Ozay Hava Ozay Ozgur 《Journal of Polymers and the Environment》2022,30(7):2928-2942
Journal of Polymers and the Environment - This study is the first report of the preparation of hydroxyethyl starch (HES) hydrogels rapidly crosslinked with divinyl sulfone in a single step and... 相似文献
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