Chemical modification of sodium alginate with thiosemicarbazide for the removal of Pb(II) and Cd(II) from aqueous solutions

Bryan M. Córdova, Christian R. Jacinto, Hugo Alarcón, Ily M. Mejía, Rosario C. López, Denise de Oliveira Silva, Eder Cavalheiro, Tiago Venâncio, Juan Z. Dávalos, A. C. Valderrama

Research output: Contribution to journalArticle (Contribution to Journal)peer-review

11 Scopus citations

Abstract

A new material (AlgOx–TSC), based on alginate (Alg) chemically modified with thiosemicarbazide (TSC), has been synthesized and tested as an effective biomaterial to remove Pb(II) and Cd(II) ions in aqueous solutions. The synthesis was carried out by controlling the following steps, i/partial oxidation process of alginate in NaIO4 to obtain AlgOx, ii/reacting of AlgOx, at 40–45 °C, with TSC in NaBH4. AlgOx–TSC has been characterized by Field Emission Scanning Electron Microscopy (FESEM/EDS), Fourier Transform Infrared Spectroscopy (ATR-IR), solid state 13C NMR spectroscopy and Point of Zero Charge (pHPZC) measuremenmts. In order to enhance the sorption process, the effect of contact time, sorbent dosage, initial concentration and reusability of the novel sorbent were investigated becoming the AlgOx–TSC a promising material capable of removing high concentrations of heavy metal ions such as Pb(II) (up to 950 mg/g at pH 3) and Cd(II) (up to 300 mg/g at pH 7) in aqueous solutions.

Original languageEnglish
Pages (from-to)2259-2270
Number of pages12
JournalInternational Journal of Biological Macromolecules
Volume120
DOIs
StatePublished - Dec 2018
Externally publishedYes

Keywords

  • Alginate
  • Cd(II)
  • Chemical modification
  • Pb(II)
  • Thiosemicarbazide

Fingerprint Dive into the research topics of 'Chemical modification of sodium alginate with thiosemicarbazide for the removal of Pb(II) and Cd(II) from aqueous solutions'. Together they form a unique fingerprint.

Cite this