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Multiscale visualization of the structural and characteristic changes of sewage sludge biochar oriented towards potential agronomic and environmental implication

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Zhang, Jining, Lü, Fan, Zhang, Hua, Shao, Liming, Chen, Dezhen, He, Pinjing·2015·Scientific Reports
DOI 10.1038/srep09406
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Abstract

Sewage sludge biochars were obtained at different pyrolysis temperatures from 300°C to 900°C and their macro- and microscale properties were analyzed. The biochar's plant-available nutrients and humus-like substances in the water-extractable phase and fixed nutrients in the solid fraction were evaluated for their potential agronomic implications. FT-IR, Raman, XRD, XPS and SEM techniques were used to investigate the chemical structure, functional groups and microcrystal structure on the surface of the biochar. The results revealed minor chemical changes and dramatic mass loss in the biochar obtained at 300–500°C, whereas significant chemical changes in the biochar were obtained at 600–900°C. The concentrations of plant-available nutrients as well as fulvic- and humic-acid-like materials decreased in the biochar samples obtained at higher temperatures. These results implied that the biochar samples pyrolyzed at 300–500°C could be a direct nutrient source and used to neutralize alkaline soil. The surface area and porosity of the biochar samples increased with temperature, which increased their adsorption capacity. Rearrangement occurred at higher temperature 600–900°C, resulting in the biochar becoming increasingly polyaromatic and its graphite-like carbon becoming organized.

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Metadata

Authors
Zhang, J., Lü, F., Zhang, H., Shao, L., Chen, D., & He, P.
Venue
Scientific Reports
Publisher
Springer Science and Business Media LLC
Published
2015-03-24
Volume
5
Issue
1
Pages
9406-9406
ISSN
2045-2322 (ISSN-L)
DOI
10.1038/srep09406
OpenAlex
W2037327281
Cited by
237
References
5
FWCI
8.49
Type
journal article
Language
en
Open access
gold
Licence

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Zhang, J., Lü, F., Zhang, H., Shao, L., Chen, D., & He, P. (2015). Multiscale visualization of the structural and characteristic changes of sewage sludge biochar oriented towards potential agronomic and environmental implication. Scientific Reports. https://doi.org/10.1038/srep09406

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