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Different effects of N 2 -flow and air-limited pyrolysis on bamboo-derived biochars' nitrogen and phosphorus release and sorption characteristics.
- Source :
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The Science of the total environment [Sci Total Environ] 2020 Apr 01; Vol. 711, pp. 134828. Date of Electronic Publication: 2019 Nov 22. - Publication Year :
- 2020
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Abstract
- Advantages for biochars used in soil improvement have been proposed to their nutrients release and sorption characteristics which strongly depend on their production conditions. N <subscript>2</subscript> -flow and air-limited pyrolysis are two different widely-applied oxygen-limited pyrolysis methods for producing biochars, however, their different effects on nutrients release and sorption characteristics of biochars remains unknown. In this study, bamboo derived biochars pyrolyzed in N <subscript>2</subscript> -flow (BC-N <subscript>2</subscript> ) and air-limited environments (BC-Air) at the temperature of 150~750 °C were used to compare the release and sorption of nitrogen and phosphorous nutrients. The results showed that release of nitrogen and phosphorous in BC-Air were always greater than those in BC-N <subscript>2</subscript> , the maximum nitrogen and phosphorous release of BC-Air (0.65 mg/g at 750 °C) is about 7.7 times of that of BC-N <subscript>2</subscript> (0.084 mg/g at 450 °C). Both BC-N <subscript>2</subscript> and BC-Air had no/little sorption of phosphate. Meanwhile, the sorption capacity of ammonium nitrogen on BC-Air (1.83 ~ 4.67 mg/g) was always greater than that on BC-N <subscript>2</subscript> (0.23 ~ 1.34 mg/g) at the pyrolysis temperature of 300 ~ 750 °C. Phosphorous-containing minerals in ash was an enhancing factor for the release of phosphorous and sorption of ammonium nitrogen on BC-Air. Furthermore, with increasing pyrolysis temperature, the release amount of phosphorous from BC-Air and the sorption capacity of ammonium nitrogen on BC-Air increased. The results show that high pyrolysis temperature combined with air-limited environment produced biochars are optimal for nutrients enhancement and retention.<br />Competing Interests: Declaration of Competing Interest The authors declare that there is no conflict of interest regarding the publication of this article.<br /> (Copyright © 2019 Elsevier B.V. All rights reserved.)
- Subjects :
- Adsorption
Nitrogen
Phosphorus
Pyrolysis
Charcoal
Subjects
Details
- Language :
- English
- ISSN :
- 1879-1026
- Volume :
- 711
- Database :
- MEDLINE
- Journal :
- The Science of the total environment
- Publication Type :
- Academic Journal
- Accession number :
- 31812386
- Full Text :
- https://doi.org/10.1016/j.scitotenv.2019.134828