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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Effect of the pH on the Cr(VI) Sorption on HDTMA-zeolites
Author(s)
Maria Chojnacka1, Jolanta Warchoł2 and Paulina Sobolewska3
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DOI:10.17265/2162-5298/2018.07.001
Affiliation(s)
1. Polytechnic Faculty, The President Stanisław Wojciechowski State University of Applied Sciences in Kalisz, Kalisz 62-860, Poland
2. Department of Chemistry, Wroclaw University of Science and Technology, Wrocław 50-370, Poland
3. Department of Water Purification and Protection, Rzeszow University of Technology, Rzeszów 35-959, Poland
ABSTRACT
The uptake of Cr(VI) from aqueous solutions was investigated using
clinoptilolite and phillipsite rich tuffs. These minerals were modified using
hexadecyltrimethyl-ammonium bromide
(HDTMA-Br) and used for Cr(VI) ions removal. The physicochemical
characteristics of zeolitic minerals were revealed by XRD, XRF, BET and FT-IR
techniques. The concentration of Cr(VI) working solutions, Cinit ranged between 5-100 mgL-1, were prepared by
dilution of the stock solution with distilled water with pHinit adjusted to the value of 3.0 or 4.0 or 5.0. The residual concentrations of
chromium in the liquid samples were analyzed by ICP-OES. The uptake capacities
of modified zeolites were compared in batch sorption experiments. The
comparison of the obtained data identified that efficiency of Cr(VI) sorption
onto clinoptilolite is always higher than in phillipsite case. The analysis of
the infrared spectra revealed that after adsorption of Cr(VI) the
characteristics for HDTMA vibrations were shifted in PHI-HDTMA case, while for
CLI-HDTMA the intensity of characteristics peaks decreased.
KEYWORDS
Hexavalent chromium, HDTMA-Br modified zeolites, sorption, FTIR spectra.
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