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Thiouracil modified activated carbon as a sorbent for some precious and heavy metal ions

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Abstract

A new sorbent is prepared by modifying activated carbon obtained from apricot stones with 2-hydroxy-2-mercaptopyrimidine (2-thiouracil). The products have been characterized as to their surface area, pore volumes, content of the functional groups with basic and acidic properties, IR spectra, sulfur content. Their sorption properties with respect to some precious (Au(III), Ag(I), Pt(II)) and heavy (Cu(II), Mn(II), Ni(II), Hg(II)) metals are investigated. The sorption is studied as a function of pH (in the interval 1÷8) and stirring time (1÷24 h). The static sorption capacities towards the metal ions are determined under optimum conditions at room temperature. The new sorbent containing thiouracil is appropriate for simultaneous preconcentration of the precious and heavy metal ions within a wide pH range. It shows a significantly higher capacity for the investigated metal ions than the original carbon.

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Acknowledgement

The authors are indebted to the Laboratory of Solid Fuels Chemistry from the Institute of Organic Chemistry, Bulgarian Academy of Sciences, for supplying the initial activated carbon.

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Authors and Affiliations

  1. Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 11, Sofia, 1113, Bulgaria

    Paunka Vassileva, Penka Tzvetkova, Lako Lakov & Ognyan Peshev

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  1. Paunka Vassileva
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  2. Penka Tzvetkova
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  3. Lako Lakov
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  4. Ognyan Peshev
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Correspondence to Paunka Vassileva.

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Vassileva, P., Tzvetkova, P., Lakov, L. et al. Thiouracil modified activated carbon as a sorbent for some precious and heavy metal ions. J Porous Mater 15, 593–599 (2008). https://doi.org/10.1007/s10934-007-9138-y

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  • DOI: https://doi.org/10.1007/s10934-007-9138-y

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