期刊
BIORESOURCE TECHNOLOGY
卷 304, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122978
关键词
Arsenic; Biochar; X-ray absorption near-edge structure (XANES); Confocal micro-X-ray fluorescence imaging (CMXRFI); Redox reaction
资金
- Major Science and Technology Program for Water Pollution Control and Treatment [2018ZX07110]
- National Natural Science Foundation of China [41877478]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUGGC06]
- National Key Research and Development Program of China [2018YFC1801706-04]
Batch experiments followed by solid-phase analyses were conducted to explore As(III) and As(V) removal mechanisms by Fe-modified biochars (FeBC) pyrolyzed at different temperatures (300, 600, and 900 degrees C). Arsenic removal by FeBC, best described by pseudo-second order kinetic and Langmuir isotherm models, increased from 73.8 to 99.9% for As(III) and 86.8 to 99.9% for As(V) as the pyrolysis temperature increased. The addition of calcite enhanced the removal efficiency (all > 99%). Confocal micro-X-ray fluorescence imaging (CMXRFI) analyses indicated As co-located with Fe and diffused deeper into the particles as the pyrolysis temperature increased. For As(III)-spiked systems, X-ray absorption near-edge structure (XANES) data indicated 20.2 to 81.5% of As(III) was oxidized to As(V) as the pyrolysis temperature increased; an increase of oxidation efficiency was observed after adding calcite. For As(V)-spiked systems, no As(V) reduction was observed. Overall, As(III/V) removal using FeBC was affected by the spatial distribution and species of As.
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