Water uptake in biochars: The roles of porosity and hydrophobicity Public Deposited

http://ir.library.oregonstate.edu/concern/articles/wh246t84q

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at:  http://www.journals.elsevier.com/biomass-and-bioenergy/.

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  • We assessed the effects of porosity and hydrophobicity on water uptake by biochars. Biochars were produced from two feedstocks (hazelnut shells and Douglas fir chips) at three production temperatures (370°C, 500°C, and 620°C). To distinguish the effects of porosity from the effects of hydrophobicity, we compared uptake of water to uptake of ethanol (which is completely wetting and not affected by hydrophobic materials). For both feedstocks, low temperature biochars took up less water than high temperature biochars but the same amount of ethanol, suggesting that differences in water uptake based on production temperature reflect differences in surface hydrophobicity, not porosity. Conversely, Douglas fir biochars took up more water than hazelnut shell biochars due to greater porosity. Thus, designing biochars for water holding applications requires two considerations: (a) creating sufficient porosity through feedstock selection, and (b) determining a production temperature that reduces hydrophobicity to an acceptable level.
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  • Gray, M., Johnson, M. G., Dragila, M. I., & Kleber, M. (2014). Water uptake in biochars: The roles of porosity and hydrophobicity. Biomass and Bioenergy, 61, 196-205. doi:10.1016/j.biombioe.2013.12.010
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-04-21T14:59:15Z No. of bitstreams: 2 GrayMylesCropSoilScienceWaterUptakeBiochars.pdf: 953023 bytes, checksum: 08de6a3c0ab96e7e8b2404eb4a523425 (MD5) GrayMylesCropSoilScienceWaterUptakeBiochars_SupportingInformation.zip: 375838 bytes, checksum: cdc43034778b22cd3ea82bf35604f65b (MD5)
  • description.provenance : Made available in DSpace on 2014-04-21T14:59:33Z (GMT). No. of bitstreams: 2 GrayMylesCropSoilScienceWaterUptakeBiochars.pdf: 953023 bytes, checksum: 08de6a3c0ab96e7e8b2404eb4a523425 (MD5) GrayMylesCropSoilScienceWaterUptakeBiochars_SupportingInformation.zip: 375838 bytes, checksum: cdc43034778b22cd3ea82bf35604f65b (MD5) Previous issue date: 2014-02
  • description.provenance : Approved for entry into archive by Erin Clark(erin.clark@oregonstate.edu) on 2014-04-21T14:59:33Z (GMT) No. of bitstreams: 2 GrayMylesCropSoilScienceWaterUptakeBiochars.pdf: 953023 bytes, checksum: 08de6a3c0ab96e7e8b2404eb4a523425 (MD5) GrayMylesCropSoilScienceWaterUptakeBiochars_SupportingInformation.zip: 375838 bytes, checksum: cdc43034778b22cd3ea82bf35604f65b (MD5)

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