Physicochemical properties and morphology of biochars as affected by feedstock sources and pyrolysis temperatures

João Arthur Antonangelo, Hailin Zhang, Xiao Sun, Ajay Kumar

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

Feedstock sources and pyrolysis temperatures affect the physicochemical and morphological properties of biochars. We evaluated biochars derived from switchgrass (SGB) and poultry litter (PLB) pyrolyzed at 350 °C (SGB350, PLB350) and 700 °C (SGB700, PLB700) to identify their potential ability in improving soil health. Except for SGB350, the pH of biochars was high (> 10.0) and can be used as an amendment in acid soils. PLB700 had higher mineral content and nutrient availability due to its higher ash content (tenfold higher) and electrical conductivity. Surface functional groups responsible for metal retention were evidenced in all biochars. Cation exchange capacity (CEC), specific surface area (SSA), and microporosity more than doubled by increasing pyrolysis temperature from 350 to 700 °C. The pH-buffering capacity measured through acid titration curve was better than that calculated with acid/alkali additions. Biochars pyrolyzed at 700 °C have much higher pH, CEC, SSA, and stronger buffering capacity, and thus are more promising to improve soil health and reduce contaminant bioavailability.

Original languageEnglish (US)
Pages (from-to)325-336
Number of pages12
JournalBiochar
Volume1
Issue number3
DOIs
StatePublished - Sep 2019
Externally publishedYes

Bibliographical note

Funding Information:
We would like to thank Dr. Hasan Atiyeh, Professor at Oklahoma State University (OSU), for the support provided in laboratory analysis. The authors also appreciate the support of Dr. Keri B. Cantrell, former Agricultural Engineer with USDA-ARS, who supplied the biochars used for this study.

Publisher Copyright:
© 2019, Shenyang Agricultural University.

Keywords

  • Biochars
  • Physicochemical properties
  • Poultry litter
  • Pyrolysis
  • Switchgrass

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