Capacity and mechanism of arsenic adsorption on red soil supplemented with ferromanganese oxide–biochar composites
Two ferromanganese oxide–biochar composites (FMBC1 and FMBC2) were prepared by an impregnation method to promote the adsorption of As on red soil. Maximum adsorption capacities (Qm) of 0.687 and 0.712 mg g−1 were observed for FMBC1 and FMBC2, respectively, corresponding to increases of 104 and 111% relative to the control treatment (Qm = 0.337 mg g−1). Treatment with FMBC1 increased the pH of red soil, whereas a reverse trend was observed for FMBC2. A variety of analytical techniques were used to explain the differences between FMBC1 and FMBC2, revealing that the oxidation of As(III) to As(V) by Mn and Fe oxides was aided by interactions with the oxygen-containing functional groups of the ferromanganese oxide–biochar composites. Thus, red soil supplemented with the ferromanganese oxide–biochar composites mainly adsorbed As by chemisorption, thereby projecting ferromanganese oxide–biochar composites as potential absorbents for effectively remediating As-polluted red soil.
KeywordsFerromanganese oxide–biochar composite (FMBC) Arsenic Red soil Adsorption ability
Ferromanganese oxide–biochar composite
Differential scanning calorimetry
Scanning electron microscopy
X-ray photoelectron spectroscopy
Dissolved organic carbon
Oxidation reduction potential
Cation exchange capacity
The authors acknowledge financial support from the National Science Foundation of China (grant numbers 41771525 and 41273136) and the National Science Foundation of Tianjin (grant number 15JCZDJC33900).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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