Methodical study of chromium (VI) ion adsorption from aqueous solution using low-cost agro-waste material: isotherm, kinetic, and thermodynamic studies

Adsorptive performances and valorization of green synthesized biochar–based activated carbon from banana peel and corn cob composites for the abatement of Cr(VI) from synthetic solutions: Parameters, isotherms, and remediation studies

“…7 a. A study by Akiode et al [ 84 ] found that the speciation of chromium changes with the pH of the solution. At pH levels higher than 6, chromium ions are present as CrO 4 2− .…”