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Steel slag as a low-cost sorbent for metal removal in the presence of chelating agents
Eveliina Repo,Jolanta K. Warchoł,Lena Johansson Westholm,Mika Sillanpaa 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Industrial byproduct, steel slag was used as a low-cost sorbent for the removal of Co(II), Ni(II), Cd(II), andPb(II) from aqueous solutions containing chelating agents; EDTA, citrate, and oxalate. Equilibrium andkinetic studies were conducted. Clear dependency between speciation of metals and their sorptionbehavior was observed. Precipitation and adsorption were suggested as main mechanisms. Diffusionplayed an important role in the kinetics of metal removal. Notable leaching of elements was observedwhen steel slag was in contact with the solutions under study. Modification with chitosan wassuccessfully used to prevent leaching and improve the sorption capacity of steel slag.
Dynamic Multithreshold Signature without the Trusted Dealer
Jacek Pomykała,Tomasz Warchoł 보안공학연구지원센터 2008 International Journal of Multimedia and Ubiquitous Vol.3 No.3
In the article a new threshold signature for dynamic groups without the trusted dealer is presented. The scheme is based on the Boneh, Lynn and Shacham short signature from the Weil pairing. The scheme provides an efficient solution especially for the family of dynamic groups. We prove the security of the scheme in the random oracle model assuming the chosen target CDH problem.