Separation and enrichment of Cr(VI) ion in waters using solid phase extraction and evaluation of adsorption, kinetic and thermodynamic parameters
Year: 2024
Type: article
Abstract: Cr(III) and Cr(VI) ions in waters were separated by using column method containing Amberlite IRA 900 copolymer resin. Cr(VI) ion was separated, pre-concentrated and determined by using flame atomic absorption spectrometry. After oxidizing all Cr(III) into Cr(VI) with H2O2, whole chromium (Cr(III) + Cr(VI) ions) was determined. Concentration of Cr(III) was obtained by subtracting Cr(VI) level from whole chromium. Recovery of Cr(VI) ion at optimum conditions such as pH (5.5 – 6), type and concentration of eluent solution (5 mL of 1 mol/L HCl + 2% (m/v) ascorbic acid) and flow rate (3 mL/min) obtained was 99 ± 1% for five replicate measurements. Analytical detection and quantification limits were found as 0.11 and 0.38 µg/L, respectively. The enrichment factor of Cr(VI) ion found was about 100 after using optimization conditions. Accuracy of proposed method was checked by analyzing Cr(VI) in CWW-TM-D Wastewater (SRM) containing Cr(III) and Cr(VI) ions and applied to real waters. Langmuir adsorption model was suitable for Cr(VI) ion and maximum adsorption capacity found was 303 mg/g at 298 K. Thermodynamic parameters (ΔG°, ΔH° and ΔS°) and activation energy (Ea) were determined. Adsorption of Cr(VI) ion on resin was chemical ion-exchange, spontaneous and exothermic process.
Source: DergiPark (Istanbul University)
Authors: Tunçeli, Adelet, Şahin, Hatice, Yalçınkaya, Özcan, Acar, Orhan
Institution: Gazi University
Language: English
Subfield: Analytical Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: green
Funder: Gazi Üniversitesi
OpenAlex ID: W4405985608