Coupling Alternating Current and Biosorption for the Removal of Hexavalent Chromium

Abstract

The effect of coupling alternating current (AC) with biosorption using Tunisian corn stigmata on the removal of hexavalent chromium (Cr(VI)) from aqueous solution was studied. A comparative study was performed between biosorption alone and biosorption coupled with AC, for the removal of Cr(VI). The effects of various operating parameters were studied, such as the solution pH, the contact time, the initial concentration, the temperature, and the salt concentration. The comparison between biosorption in the presence and absence of an AC shows the importance of the AC in the acceleration of the biosorption process. The kinetic study showed that the fractal Brouers‐Sotolongo model was the best model for describing the random distribution of the active sites.

The combined chemical and mechanical modifications of cigarette: a novel methodology to reduce harmful effects

“…At the same time at pH values above 7.38 L.C can adsorb positively charged species (Mbarki et al 2020) . The best results for AO, biosorption , and coupling AO with biosorption were obtained for pH =2 and reached respectively, 97.8, 54, and 98.7% which can be explained as follow: As the Amaranth Red (E123) is an anionic azo dye with predominantly negative charges at acidic pH (Ahmad and Kumar 2011) and based on the fact that for pH under 7.38, the dominant functional groups of L.C are positively charged and therefore attract strongly the negatively charged species.…”

Removal of Hexavalent Chromium by Electrospun Silicon Dioxide Nanofibers Embedded with Copper-Based Organic Frameworks

“…At present, there are two main treatment methods to remove hexavalent chromium. One method is to convert Cr (VI) to low-toxic Cr (III) by reduction technology and remove it by chemical precipitation, including the electrolytic reduction method [3], chemical reduction method [4], and so on. Another approach is to use resource recovery routes such as ion exchange [5], adsorption [6], and reverse osmosis [7].…”