Characterization and quantification of electron donating capacity and its structure dependence in biochar derived from three waste biomasses

Yue Zhang, Xiaoyun Xu, Lingzhi Cao, Yong Sik Ok, Xinde Cao

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Biochar has shown a unique electrochemical property being involved in various redox reactions in soil and water. In this study, the electron donating capacities (EDCs) of biochar pyrolyzed at 200–800 °C from pine wood, barley grass and wheat straw were investigated by using the mediated electrochemical oxidation method. The EDC values for all biochar were in the range of 0.18–1.83 mmol e (g biochar)−1, showing the increase as the temperature increased from 200 °C to 400 °C, the decrease from 400 °C to 650 °C, and then increase from 650 °C until to 800 °C. At low and intermediate temperatures of 200–650 °C, the EDCs were mainly attributed to the phenolic hydroxyl groups, while the conjugated π-electron system associated with aromatic structure dominated the EDCs of biochar at the high temperatures of over 650 °C. The barley grass- and wheat straw-derived biochar had higher EDCs than the pine wood-derived biochar, resulting from the higher phenolic hydroxyl groups in the former samples than the latter one. In conclusion, the reductive property of biochar was mainly attributed to both phenolic hydroxy group and conjugated π-electron system associated with aromatic structure, depending on the pyrolytic temperature and feedstock source. The results will help us to obtain a complete view on the role of biochar in biogeochemical redox reactions and consider developing biochar with controlled redox properties for specific environmental applications such as electron shuttle and catalyst material.

Original languageEnglish
Pages (from-to)1073-1081
Number of pages9
JournalChemosphere
Volume211
DOIs
Publication statusPublished - 2018 Nov 1

Fingerprint

Biomass
electron
Electrons
biomass
barley
straw
Redox reactions
Straw
wheat
Hydroxyl Radical
grass
Wood
biochar
temperature
Temperature
Electrochemical oxidation
Electrochemical properties
catalyst
Feedstocks
oxidation

Keywords

  • Biochar
  • Electron donating capacities
  • Phenolic groups
  • Waste biomass
  • π-electron system

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Characterization and quantification of electron donating capacity and its structure dependence in biochar derived from three waste biomasses. / Zhang, Yue; Xu, Xiaoyun; Cao, Lingzhi; Ok, Yong Sik; Cao, Xinde.

In: Chemosphere, Vol. 211, 01.11.2018, p. 1073-1081.

Research output: Contribution to journalArticle

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