Coeffect of pyrolysis temperature and potassium phosphate impregnation on characteristics, stability, and adsorption mechanism of phosphorus-enriched biochar
Abstract
Potassium phosphate (K 3 PO 4 )-impregnated bamboo was pyrolyzed at temperatures ranging from 350 to 950 °C to explore the coeffect of pyrolysis temperature and K 3 PO 4 impregnation on biochar's characteristics and adsorption behavior. The degree of aromatization and graphitization in phosphorus-enriched biochars (PRBCs) rose as temperature increased, whereas H/C and O/C ratios, pH value, and O-containing group content decreased. The pre-aging impact of K 3 PO 4 impregnation results in increased stability and adsorption performance of PRBCs. Adsorption mechanism of PRBCs to heavy metal varies from pyrolysis temperature. Micropores dominate medium-temperature PRBCs (prepared at 550 ∼ 750 °C), possessing the highest P-containing group content (116 % that of PRBC-350) and maximal adsorption capacity (greater than289 mg/g). The medium-temperature PRBCs adsorb Cd (II) via the role of O-containing groups, PO 4 3- , and P 2 O 7 4- , mainly by reactions of organic complexation, precipitation and inorganic complexation, respectively. 550 °C is the optimal pyrolysis temperature for both energy saving and heavy metal adsorption.
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The VC decrease suggests degradation of labile surface groups and formation of stable C-C and C=C bonds through dehydrogenation, deoxygenation, isomerization, and aromatization.
“suggesting degradation of labile surface groups (e.g., -COOH, -C-OH) and formation of stable C-C and C=C bonds through dehydrogenation, deoxygenation, isomerization, and aromatization [118].”
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- Authors
- Zhang, H., Liao, W., Zhou, X., Shao, J., Chen, Y., Zhang, S., & Chen, H.
- Affiliations
- State Key Laboratory of Coal Combustion (CN)
- Corresponding author
- Zhang, Shihong
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2022-01
- Volume
- 344
- Issue
- Pt B
- Pages
- 126273
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W3208035224
- Cited by
- 91
- References
- 44
- Citations by year
- 2026: 14 · 2025: 20 · 2024: 26 · 2023: 19 · 2022: 12
- FWCI
- 4.25
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China (51976075)
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Environmental Science › Waste Management and Disposal › Phosphorus and nutrient management
- Keywords
- pyrolysis temperature, heavy metal adsorption, cadmium adsorption, adsorption mechanism, biochar stability, micropores, organic complexation, precipitation chemistry
- MeSH terms
- Pyrolysis, Adsorption, Charcoal, Phosphates, Phosphorus, Temperature, Potassium Compounds
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