Use of sulfuric acid-carbonization materials from grape pulp for the removal of hexavalent chromium (Cr(VI)): mechanism and characterization

Arslanoglu H. , Ciftci H.

INTERNATIONAL JOURNAL OF PHYTOREMEDIATION, vol.23, no.11, pp.1145-1156, 2021 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 23 Issue: 11
  • Publication Date: 2021
  • Doi Number: 10.1080/15226514.2021.1880368
  • Page Numbers: pp.1145-1156
  • Keywords: Cr(VI) adsorption-isotherm-kinetic-thermodynamic, Cr(VI) reduction, Grape pulp-carbonization-carbon


This study investigated the reduction of hexavalent chromium (Cr(VI)) with sulfur dioxide (SO2) and adsorption of Cr(VI) onto dried grape pulp carbonized with sulfuric acid. Cr(VI) reduction capacities of SO2 were determined. The filtrate was titrated with NaOH solution after shaking and filtering the carbonized material to retain unreacted sulfuric acid (H2SO4). Simple washing recovered 25-38% of the experimental acid at low concentrations. The carbonized material was washed twice with distilled water and then dried at 105 degrees C and weighed. The carbonized material had a yield of 56.6% (grape pulp/sulfuric acid ratios of 1:2), and the lower the H2SO4 content, the better the yield, suggesting that the higher the acid content, the lower the Cr(VI) content per unit grape pulp. Cr(VI) reduction capacities were 219.5, 195.3, and 190.9 mg Cr(VI)/g-H2SO4 for the grape pulp/sulfuric acid ratios of 1:1, 1:2, and 1:3, respectively.