Effective removal of Cr(VI) ions from the aqueous solution by agro-waste-based biochar: an exploration of batch and column studies

Removal of Cr(vi) in wastewater by Fe–Mn oxide loaded sludge biochar

“…20 According to the previous ndings, the C]C group shied from 1640 cm −1 to 1610 cm −1 aer Cr(VI) removal from solution, which was also consistent with the present study. 1,22 These analysis showed that FMBC adsorbed Cr(VI) on surface through complexation and electrostatic interactions, and Cr(VI) ion was reduced to cationic Cr(III), and then released cation Cr(III) into solutions by electrostatic repulsion. When solution pH outweighed zero potential point of FMBC, the negatively charged FMBC adsorbed the positively charged Cr(III) from the solution in the form of Cr(III)-p interaction, complexation and electrostatic interaction.…”

“…Chromium (Cr) mainly exists in two valence states, Cr(VI) and Cr(III), of which Cr(VI) is highly toxic, difficult to biodegrade and easy to be enriched in the food chain. 1,2 If Cr-containing wastewater is not treated properly, it will bring great harm to human beings and nature. Currently, the main method for Cr(VI) removal is reverse osmosis, ion exchange, oxidation reduction, membrane separation and adsorption.…”