Sorption of uranium using silica gel with benzoylthiourea derivatives

Ayata S., Aydinci S., MERDİVAN M., BİNZET G., KÜLCÜ N.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, vol.285, no.3, pp.525-529, 2010 (SCI-Expanded, Scopus) identifier identifier

  • Publication Type: Article / Article
  • Volume: 285 Issue: 3
  • Publication Date: 2010
  • Doi Number: 10.1007/s10967-010-0646-x
  • Journal Name: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.525-529
  • Keywords: Benzoylthiourea derivative, Solid phase extraction, Uranium, Preconcentration, Silica gel
  • Dokuz Eylül University Affiliated: Yes

Abstract

Benzoylthiourea derivatives (N,N-diphenyl-N'-(3-methylbenzoyl)thiourea and diphenyl-N'-(4-methylbenzoyl)thiourea) were impregnated onto silica gel. The preconcentration of uranium(VI) from aqueous solution was investigated. Extraction conditions were optimized in batch method prior to determination by uv-visible absorption spectrometry using arsenazo(III). The optimum pH for quantitative adsorption was found as 3-7. Quantitative recovery of uranium (VI) was achieved by stripping with 0.1 mol L(-1) HCl. Equilibration time was determined as 30 min for 99% sorption of U(VI). Under optimal conditions, dynamic linear range of for U(VI) was found as 0.25-10 mu g mL(-1). The relative standard deviation as percentage and detection limit were 5.0% (n = 10) for 10 mu g mL(-1) U(VI) solution and 8.7 ng mL(-1), respectively. The method was employed to the preconcentration of U(VI) ions in soil and tap water samples.