Adsorption, Biosorption and Bioaccumulation Used to Remove Chromium(III) from Tanning Wastewaters: A Critical Review

作者：Hintermeyer B H; Tavani E L^*

来源：Journal of the Society of Leather Technologists and Chemists, 2013, 97(6): 231-237.

Processes of adsorption, biosorption and bioaccumulation were analyzed considering their ability to remove chromium(III). Already published studies that represent the actual state of knowledge were taken into account for this purpose. The review includes a detailed description of principal physicochemical properties of adsorbents, biosorbents and micro-organisms, pointing out those features that explain the mechanism by which the separation occurs. We noted an inadequate evaluation of the bearing species of the tanning agent with respect to treated solutions and that, not always the most adequate species was selected. In order to elucidate both aspects, the way in which the electrical charge and the size of studied complex ions affect the attraction force in adsorption/biosorption were examined. The consideration of such parameters proved that the electrical charge varies enormously from one substance to another and besides it prevails on the size. Accordingly, it was decided to focus attention only on treatments that were performed with tanning wastewater or with basic chromium(III) sulphate. Finally, the amounts of chromium(III) sequestered per gram of each adsorbent/biomaterial were compared. The largest uptake was 189.1mg/g, obtained with a Cr-resistant autochthonous fungus.

• 出版日期2013-12