Mobile organic compounds in biochar. Relationships with carbonization degree and biooil composition

Transcription

1 Engineering Conferences International ECI Digital Archives Biochar: Production, Characterization and Applications Proceedings Mobile organic compounds in biochar. Relationships with carbonization degree and biooil composition Daniele Fabbri University of Bologna, Italy Michele Ghidotti University of Bologna, Italy Follow this and additional works at: Part of the Engineering Commons Recommended Citation Daniele Fabbri and Michele Ghidotti, "Mobile organic compounds in biochar. Relationships with carbonization degree and bio-oil composition" in "Biochar: Production, Characterization and Applications", Franco Berruti, Western University, London, ntario, Canada Raffaella cone, Heriot-Watt University, Edinburgh, UK ndrej Masek, University of Edinburgh, Edinburgh, UK Eds, ECI Symposium Series, (2017). This Abstract and Presentation is brought to you for free and open access by the Proceedings at ECI Digital Archives. It has been accepted for inclusion in Biochar: Production, Characterization and Applications by an authorized administrator of ECI Digital Archives. For more information, please contact

2 Daniele Fabbri Michele Ghidotti University of Bologna

3 migration to water emission to air soil-biota interaction Source: PSR RER RIFASA dissolved organic carbon dynamic

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5 Analysis Water soluble organic compounds Relationships between the composition in biochar and the corresponding bio-oil Produced from the same biomass (corn stalk) at different pyrolysis temperatures

6 Pyrolysis vapours N 2 flow 1 L /min Biochar -14 C Bio-oil Heating rate 0.8 C/s Holding time = 20 min Pyrolysis C Vapours C

7 C Biochar water extracts 1g:10 ml 72 h r.t. Seven biochar samples with different H/C ratios From 0.8 to 0.3 Bio-oil water extracts 1:10 v/v

8 Chemical typology Analytical method Information SEMIVLATILE more volatile SPME // GC-MS Structural formula HYDRPHILIC less volatile ESI (-) FTICR-MS Molecular formula UNSATURATED Conjugated any volatility FLURESCENCE SP. Bulk

9 microfiber Thermal Desorption Y 1 ml water extract ml 2 M phosphate buffer at ph 5.7, 30 min with Car-PDMS fiber GC-MS min

10 BICHAR 36 compounds mostly acids HEMICELLULSE LIPID BI-IL 124 compounds Methoxyphenols LIGNIN H H H H H H H H H H H H 350 C H minutes

11 Concentration (µg/g) 9000 BI-IL C BICHAR H/C

12 INISATIN ESI Source ESI (-) Negative ion electrospray ionisation IN SEPARATIN FT-ICR Fourier transform ion cyclotron resonance x FTICR SPECTRUM BI-IL 350 C [M-H] m/z x From exact mass to unique molecular formula [ C 7 H 7 2 ] m/z

13 Number of peaks (compounds) C BI-IL BICHAR Pual Signac, Palais des Papes Avignon,Musee d rsay, Paris. Source::wikimedia commons

14 BI-IL Mild T effect Mostly 4-6 BI-IL C BICHAR Strong T effect Mostly 2 at high T BICHAR z

15 350 C 450 C 550 C BI-IL BICHAR PAHs Lignin phenols o-eugenol Fulvic acids Model compounds

16 BICHAR BI-IL LIGNIN- PHENLICs C1 C2 C3 C4 FULVIC- LIKE % Loading BC350 BC400 BC450 BC500 BC550 BC600 BC650 0 L350 L400 L450 L500 L550 L600 L650 Fluorescence signals decomposed into underlying four individual fluorescence components: C1-2 phenols, C3-4 humics

17 control D.Fabbri, Mobile organic compounds in biochar- ECI Conference Alba, Aug 20-25, 2017 control control 450 C BICHAR BICHAR SHT length promoted RT length reduced Fulvic acid-like structures could be associated to improved shoot growth

18 The pattern of WSCs in bio-oil was not affected by pyrolysis temperature: it is essentially build up at C The pattern of WSCs in biochar was significantly different from that of bio-oil and the abundance decreased with increasing pyrolysis temperature. Increasing carbonisation reduces the extent of pyrolysis products sorbed by biochar and their migration into water. favours the release of components similar to soil organic matter. condensation desorption PYRLYSIS water volatilisation adsorption