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One-step synthesis of a novel N-doped microporous biochar derived from crop straws with high dye adsorption capacity.
- Source :
-
Journal of Environmental Management . Jul2016, Vol. 176, p61-68. 8p. - Publication Year :
- 2016
-
Abstract
- N-doping is one of the most promising strategies to improve the adsorption capacity and selectivity of carbon adsorbents. Herein, synthesis, characterization and dye adsorption of a novel N-doped microporous biochar derived from direct annealing of crop straws under NH 3 is presented. The resultant products exhibit high microporosity (71.5%), atomic percentage of nitrogen (8.81%), and adsorption capacity to dyes, which is about 15–20 times higher than that of original biochar. Specifically, for the sample NBC800-3 pyrolyzed at 800 °C in NH 3 for 3 h, its adsorption for acid orange 7 (AO7, anionic) and methyl blue (MB, cationic) is up to 292 mg g −1 and 436 mg g −1 , respectively, which is among the highest ever reported for carbonaceous adsorbents. The influences of N-doping and porous structure on dye adsorption of the synthesized carbons are also discussed, where electrostatic attraction, π–π electron donor-accepter interaction, and Lewis acid-base interaction mainly contribute to AO7 adsorption, and surface area (especially pore-filling) dominates MB adsorption. The N-doped biochar can be effectively regenerated and reused through direct combustion and desorption approaches. [ABSTRACT FROM AUTHOR]
- Subjects :
- *BIOCHAR
*STRAW
*MICROPOROSITY
*CHEMICAL synthesis
*CARBON absorption & adsorption
Subjects
Details
- Language :
- English
- ISSN :
- 03014797
- Volume :
- 176
- Database :
- Academic Search Index
- Journal :
- Journal of Environmental Management
- Publication Type :
- Academic Journal
- Accession number :
- 114628419
- Full Text :
- https://doi.org/10.1016/j.jenvman.2016.03.043