Preparation and Study of acid-base and ion-exchange properties of biochar from waste coffee grounds
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Autor:in (Körperschaft)
Publikationsdatum
01.11.2024
Typ der Arbeit
Studiengang
Sammlung
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Ecological Engineering & Environmental Technology
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
25
Ausgabe / Nummer
11
Seiten / Dauer
399-409
Patentnummer
Verlag / Herausgebende Institution
Polish Society of Ecological Engineering
Verlagsort / Veranstaltungsort
Lublin, Polen
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Increased consumption of coffee in the world leads to the accumulation of food waste that is not properly utilised properly, but have prospects for further processing into a targeted with added value. The aim of this study is to produce biochar from waste coffee grounds by coffee grounds by conventional pyrolysis and microwave irradiation, determination of its chemical and particle size distribution, study of acid-base and ion exchange properties, ability to bind ions and lead ions for further use as an additive in the production of biogas production. Given the high cost of conventional pyrolysis to produce the required volumes of biochar, it is promising to consider an alternative option that will be significantly cost-effective and efficient. After carbonisation, we determined the biopolymer composition, acid-base and ion exchange properties of the raw materials and biochar using various methods, such as the Kjeldahl Hogedron-Jensen, potentiometric titration and others. The results of the maximum cation exchange capacity of raw materials and biochar indicate that biochar has a less pronounced tendency to exchange cations in the range of 0.89–1.15 μeV/g than raw materials, the value of which is mainly in the range of 1–3 μeV/g, which shows less influence of biochar on the mineral balance of microorganisms during anaerobic digestion. The values of the anion exchange capacity of biochar are in the range of values 0.7–1.2 μeV/g, and the pH value of the acidic groups of biochar lie in the range of 7.1–10.7 (characterising them as weakly acidic groups), pKa is 9.6–10.7. The curves of potentiometric titration of biochar are determined by the additive contribution of all ionised groups of biochar and allow us to classify the studied products as polyfunctional ion exchangers type ion exchangers. Results of the study of biochars from waste coffee grounds show that they have ampholytic properties and act as acceptors of metal ions, as well as function as a mild pH regulator, which is important in anaerobic digestion of food waste into biogas to increase the yield of the resulting gas in accordance with the biocircular green economy model.
Schlagwörter
Ampholytes, Biochar, Coffee grounds, Metal ion acceptors, Pyrolysis, Microwave irradiation
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
2719-7050
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Gold
Lizenz
Zitation
Sokolova, T., Krusir, G., Shunko, H., Korkach, H., Makarova, O., Tolstykh, V., & Sokolova, V. (2024). Preparation and Study of acid-base and ion-exchange properties of biochar from waste coffee grounds. Ecological Engineering & Environmental Technology, 25(11), 399–409. https://doi.org/10.12912/27197050/193052