Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 413, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125252
Keywords
Ball milling; Engineered biochar; Adsorption of chromium; Reduction of chromium; Stabilization of chromium
Categories
Funding
- National Key R&D Program of China [2018YFC1801402, 2018YFC1802002]
- National Natural Science Foundation of China [41877357]
- Key R&D Program of Zhejiang Province [2019C03G2051340]
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A novel biochar/iron oxide composite was successfully prepared by ball milling iron-laden biochar, showing fast kinetics and large adsorption capacity for Cr(VI) removal. The composite performed well under acidic pH conditions, but the presence of competition ions inhibited the removal efficiency.
As the first of its kind, a novel biochar/iron oxide composite (BM-Fe-HC) was successfully prepared by simply ball milling iron-laden biochar (Fe-HC). The performance and mechanisms of Cr(VI) removal by BM-Fe-HC were investigated. Ball milling effectively reduced particle size, increased specific surface area, more importantly, enhanced the distribution and increased the exposure of iron oxides on biochar surface. As a result, Cr(VI) removal by BM-Fe-HC showed fast kinetics and large adsorption capacity with the Langmuir maximum capacity of 48.1 mg/g, higher than that of other biochar/iron composites reported in the literature. Acidic pH promoted Cr(VI) removal while competition ions (Cl-, SO42- and PO43-) inhibited Cr(VI) removal by BM-Fe-HC. Comparison of pre- and post-adsorption samples revealed that iron oxides of the BM-Fe-HC played the dominant role in the adsorption and reduction of Cr(VI) during the removal. After adsorption, part of adsorbed Cr(VI) was reduced by Fe(II) and then stabilized by Fe(III) in the form of amorphous CrxFe1_x(OH)3 on the composite surface. All the results demonstrate that novel ball-milled biochar/iron oxide composites can be used as an effective adsorbent to remove Cr(VI) from water.
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