Continuous Flow Process for Cr(VI) Removal from Aqueous Solutions Using Resin Supported Zero-Valent Iron

• Published in: Bulletin of environmental contamination and toxicology 2021-03, Vol.106 (3), p.409-414
• Main Authors: Toli, A., Mystrioti, Ch, Xenidis, A., Papassiopi, N.
• Format: Article
• Language: English
• Subjects: Adsorption; Aquatic Pollution; Aqueous solutions; Beads; Cation exchange; Cation exchanging; Cationic polymerization; Chromate; Chromates; Chromium; Chromium - analysis; Columns (structural); Continuous flow; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Green tea; Iron; Nanocomposites; Pollution; Porous materials; Reduction; Resins; Soil Science & Conservation; Waste Water Technology; Water; Water Management; Water Pollutants, Chemical - analysis; Water Pollution Control
• ISSN: 0007-4861; 1432-0800
• DOI: 10.1007/s00128-020-02843-8

The objective of the present study was to evaluate the performance of a nanocomposite material consisting of nano zero valent iron and a cation exchange resin, for the reduction of chromate, by conducting column tests. A cationic resin, Amberlyst 15, was selected as porous host material. The synthesis of the nanocomposite material (R-nFe) was carried out using Green Tea extract to obtain the reduction of adsorbed Fe(III) to the elemental state Fe(0). Three column tests were implemented with different dimensions, corresponding to variable contact times between the aqueous solution and the resin beads loaded with Fe(0), namely 168, 744 and 1260 s respectively for columns I, II and III. The results indicated that the removal of Cr(VI) follows a first order kinetic law with a chemical constant equal to 0.0526 min −1 (8.8 × 10 –4  s −1 ).