Adsorption behaviours of Th(IV) and U(VI) using nitric acid (HNO3) modified activated carbon: equilibrium, thermodynamic and kinetic studies


Öter Ç., Selçuk Zorer Ö.

INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY, vol.101, no.14, pp.1950-1965, 2021 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 101 Issue: 14
  • Publication Date: 2021
  • Doi Number: 10.1080/03067319.2019.1691184
  • Journal Name: INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
  • Journal Indexes: Science Citation Index Expanded, Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), CAB Abstracts, Chemical Abstracts Core, Chimica, Compendex, Environment Index, Food Science & Technology Abstracts, Pollution Abstracts, Veterinary Science Database
  • Page Numbers: pp.1950-1965
  • Keywords: Uranium, thorium, adsorption, activated carbon, nitric acid, AQUEOUS-SOLUTIONS, URANIUM VI, EFFICIENT REMOVAL, U-VI, SORPTION, THORIUM, EXTRACTION, SEPARATION, GASES, MODEL

Abstract

In order to research the sorption of thorium(IV) and uranium(VI) ions from aqueous solutions, the granular-activated carbon was modified with nitric acid. The modified adsorbent was identified by BET, elemental analysis, SEM and FTIR method. The influences of different parameters such as pH, contact time, temperature and initial concentration were investigated using batch system. Adsorption of Th(IV) and U(VI) onto modified carbon has been evaluated in terms of equilibrium, kinetics and thermodynamics studies. When the obtained results of thorium(IV) and uranium(VI) sorption onto modified adsorbent was applied to kinetic models, it was observed that the experimental results much better fitted the pseudo-second-order kinetic model. Adsorption process was better explained by Langmuir isotherm in comparison with other isotherms. Thermodynamic data were calculated from the sorption isotherms. Results suggested that the adsorption of Th(IV) and U(VI) on modified adsorbent was an endothermic and spontaneous process.