Pore structure and environmental serves of biochars derived from different feedstocks and pyrolysis conditions

Environmental Science and Pollution Research International
Shenggao Lu, Yutong Zong

Abstract

The pore structure of biochar determines many biochar-induced environmental serves. In order to predict quantitatively, the environmental serves of biochar, it is very important to characterize the porosity and pore size distribution of biochar and to understand how biochar pore structure relates to the environmental serves. In this study, pore characteristics of biochars derived from different feedstocks were determined using nitrogen adsorption and the mercury intrusion porosimetry (MIP) methods. A great variation of pore characteristics in biochar was found, depending on feedstock material. The specific surface area (SSA) of biochars varied greatly, ranging from 1.06 to 70.22 m2/g. Total pore volume and porosity of biochars determined by the MIP method ranged from 1.28 to 3.68 cm3/g and from 57.8 to 79.7%, respectively. The pore size distribution of biochars had bimodal peaks in the range of 5-15 and 1.5-5 μm for the herbaceous plant and broad-leaf forest biochars, while coniferous forest biochar had two peaks at the pore sizes of 6-25 and 1.5-3 μm, respectively. Biochars had substantial storage pores (0.5-50 μm), accounting for about 85% of total pore volume, and small transmission and residual pores. The herbaceous plant b...Continue Reading

References

Apr 1, 1921·Proceedings of the National Academy of Sciences of the United States of America·E W Washburn
Jan 13, 2012·Bioresource Technology·Keri B CantrellKyoung S Ro
Dec 4, 2014·Waste Management·Erin N YargicogluKurt Spokas
Mar 28, 2017·Environmental Science and Pollution Research International·Jari HyväluomaKimmo Rasa

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