Elucidation of ammonium and nitrate adsorption mechanisms by water hyacinth biochar: effects of pyrolysis temperature.

Autor: Kohira Y; Graduate School of Science and Engineering, Soka University, Tokyo, 192-8577, Japan. yudaikohira@gmail.com., Fentie D; Graduate School of Science and Engineering, Soka University, Tokyo, 192-8577, Japan.; College of Agriculture Food and Climate Science, Injibara University, Injibara, Ethiopia., Lewoyehu M; Graduate School of Science and Engineering, Soka University, Tokyo, 192-8577, Japan.; Department of Chemistry, Bahir Dar University, Bahir Dar, P.O. Box 79, Ethiopia., Wutisirirattanachai T; Graduate School of Science and Engineering, Soka University, Tokyo, 192-8577, Japan., Gezahegn A; College of Agriculture and Environmental Science, Bahir Dar University, Bahir Dar, Ethiopia.; College of Agriculture and Environmental Science, Debark University, Debark, Ethiopia., Addisu S; College of Agriculture and Environmental Science, Bahir Dar University, Bahir Dar, Ethiopia., Sato S; Graduate School of Science and Engineering, Soka University, Tokyo, 192-8577, Japan.
Jazyk: angličtina
Zdroj: Environmental science and pollution research international [Environ Sci Pollut Res Int] 2024 Dec 19. Date of Electronic Publication: 2024 Dec 19.
DOI: 10.1007/s11356-024-35808-z
Abstrakt: Numerous studies indicate biochar's nitrogen (N) adsorption capacity plays a crucial role in soil N retention. However, there is limited understanding on inorganic N adsorption mechanisms in biochar derived from aquatic weeds such as water hyacinth (WH). This study investigated ammonium-N (NH 4 + -N) and nitrate-N (NO 3 - -N) adsorption capacities and mechanisms of WH biochar pyrolyzed at different pyrolysis temperatures of 400 °C, 600 °C, and 800 °C (BC400, BC600, and BC800, respectively). Results showed NH 4 + -N adsorption was maximized (1.07-1.09 mg g -1 ) with BC400 at initial solution pH 7.0-9.0, while NO 3 - -N adsorption peaked (0.80 mg g -1 ) with BC800 at initial solution pH 5.0. Both NH 4 + -N and NO 3 - -N followed well the Pseudo-second-order model in adsorption kinetics (R 2  = 0.990-0.997 and 0.962-0.992, respectively). The Sips model accurately described the adsorption isotherms for NH 4 + -N (R 2  = 0.994-0.999) and NO 3 - -N (R 2  = 0.992-0.999). The calculated maximum adsorption capacity for NH 4 + -N and NO 3 - -N using Sips model was 11.2-16.8 mg g -1 and 0.693-4.99 mg g -1 , respectively. Co-existing cations and anions reduced NH 4 + -N and NO 3 - -N adsorption capacity, respectively, with other ions with higher valence exhibiting higher inhibition effects (43%-97% and 44%-73%, respectively). Primary adsorption mechanism for NH 4 + -N included cation exchange via oxygen-containing surface functional groups in BC400 and pore filling and surface struvite precipitation in BC800. Major adsorption mechanisms for NO 3 - -N included electrostatic interactions in BC400 and pore filling in BC800. These findings suggested that biochar derived from aquatic weeds possessed the same potential usefulness for soil N retention as biochar from other feedstocks, and that it might assist for further detailed considerations in other studies for biochar soil application.
Competing Interests: Declarations. Consent to participate: Informed consent was obtained from all individual participants included in the study. Consent to publish: Written informed consent for publication of this paper was obtained from all authors. Ethical Approval. Not applicable. Competing interests: All authors certify that they have no affiliations with or involvement in any organization or entity with any financial interest or non-financial interest in the subject matter or materials discussed in this manuscript.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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