Abstract
The adsorption characteristics of Arundo donax L.(AD) biochars for ammonium(NH4 +-N) were investigated. Absorbents were characterized through scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy analyses. AD-500 and AD-800 were produced from raw AD and pyrolyzed from room temperature to 500 and 800 °C, respectively. PD-500 was prepared by impregnating AD with a mild alkali solution and pyrolyzing from room temperature to 500 °C. The feasibility of the use of AD-500, AD-800, and PD-500 removing NH4 +-N from an aqueous solution was examined. The adsorption system followed the pseudo-first-order model. Results showed that the adsorption capacities of AD-biochars for NH4 +-N were enhanced after the final pyrolysis; temperature was increased or the mild alkali pretreatment was administered. When the initial NH4 +-N concentration was changed from 4 to 8 mM, the NH4 +-N sorption capacity of the biochar increased from 23 to 51%, with the final pyrolysis temperature increasing from 500 to 800 °C. The improved ratios were 12 to 33% when the biochar was prepared at 500 °C after the mild alkali pretreatment, and NH4 +-N sorption was enhanced due to ion exchange in the PD biochar.
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Abbreviations
- AD:
-
Arundo donax L.
- AD-RT:
-
raw Arundo donax L. straw
- AD-biochars:
-
AD-500, AD-800, and PD-500
- PD-RT:
-
Pretreated Arundo donax L. straw
- SEM:
-
Scanning electron microscopy
- XRD:
-
X-ray diffraction
- FTIR:
-
Fourier transform infrared spectroscopy
- SA:
-
Surface area
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Acknowledgements
This work was supported by the National Natural Science Foundation of PR China (NO. 51408493) and Research Fund for the Doctoral Program of Southwest University (NO. SWU114013).
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Highlight
• Biochars were produced from raw and pretreated Arundo donax L.
• An increase in pyrolysis temperature promoted the NH4 +-N removal.
• The mild alkali (H2O2 + NaOH) pretreatment benefited for NH4 +-N removal.
• NH4 +-N sorption enhanced due to ion exchange in the pretreated AD biochar.
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Zhao, Y., Huang, L. & Chen, Y. Biochars derived from giant reed (Arundo donax L.) with different treatment: characterization and ammonium adsorption potential. Environ Sci Pollut Res 24, 25889–25898 (2017). https://doi.org/10.1007/s11356-017-0110-3
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DOI: https://doi.org/10.1007/s11356-017-0110-3