Immobilization of vegetable tannins on tannery chrome shavings and their use for the removal of hexavalent chromium from contaminated water
- Resource Type
- Authors
- A. Albizane; M. El Krati; L. Chabaane; M. de la Guardia; Maria Luisa Cervera; S. Tahiri
- Source
- Chemical Engineering Journal. 174:310-317
- Subject
- chemistry.chemical_classification
Aqueous solution
Chemistry
General Chemical Engineering
Metallurgy
Langmuir adsorption model
chemistry.chemical_element
Sorption
General Chemistry
Industrial and Manufacturing Engineering
symbols.namesake
chemistry.chemical_compound
Chromium
Adsorption
Polyphenol
symbols
Environmental Chemistry
Tannin
Hexavalent chromium
Nuclear chemistry
- Language
- ISSN
- 1385-8947
Chestnut (C) and mimosa (M) tannins immobilized on chrome shavings (CS) as an adsorbent have been proposed to be an efficient and economical alternative in hexavalent chromium removal from aqueous solutions. The adsorption of hexavalent chromium onto chrome shavings-tannin (CS-T) adsorbents was performed using batch equilibrium technique at 25 ± 2 °C. The effect of pH is highly important especially in the case of high concentrations of hexavalent chromium. The maximum chromium uptake was obtained at pH 4. Two hours of contact time are enough to reach equilibrium. Sorption of chromium on CS-T was found to follow a pseudo-second order kinetic model (with correlation coefficients greater than 0.999). The adsorption equilibrium data fitted the Langmuir model well. The maximum adsorption capacity, of dry immobilized tannin adsorbent with 11.6% polyphenol, reached 42 mg Cr/g and 38 mg Cr/g in the case of chestnut and mimosa tannins, respectively.