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ABSTRACT
In the study, a novel Fe–Mn oxide-modified cattail biochar was synthesised and Cr(VI) adsorption on Fe–Mn oxide-modified biochar in water was investigated. XRF, XRD and FTIR results indicated that Fe and Mn were successfully loaded on the surface of Fe–Mn oxide-modified biochar. Batched experiments showed that Cr(VI) adsorption on Fe–Mn oxide-modified biochar fitted well with the pseudo-second-order kinetics model. The Freundlich isotherm adsorption model could better describe the isothermal adsorption process of Cr(VI) onto Fe–Mn oxide-modified biochar. The maximum saturated adsorption capacity data Qm of Fe–Mn oxide-modified biochar at 20°C, 30°C, and 40°C were respectively 46.43, 52.12, and 59.81 mg·g−1. The lower pH contributed to the adsorption of Cr(VI) onto Fe–Mn oxide-modified biochar. The effects of coexisting anions on the Cr(VI) removal efficiency were insignificant. Leaching experiments showed that the leakage risk of Mn2+ during the adsorption process was negligible. The adsorption mechanisms of Cr(VI) onto Fe–Mn oxide-modified biochar mainly involve electrostatic attraction, ligand exchange and complexation. All the results suggested that Fe–Mn oxide-modified biochars could serve as promising adsorbents for Cr(VI) pollution treatment.
Disclosure statement
No potential conflict of interest was reported by the authors.
Notes on contributors
Bo Wang is an Associate Professor at Institute of Eco-environmental Research, Liaoning Shihua University.
Fayun Li is a Professor at Institute of Eco-environmental Research, Liaoning Shihua University.
Li Wang is a Master at Institute of Eco-environmental Research, Liaoning Shihua University.