Pyrolysis processes affecting polycyclic aromatic hydrocarbon profile of pineapple leaf biochar exemplified by atmosphere/temperature and heteroatom doping

Chang-Mao Hung; Jia-Wei Cheng; Chiu-Wen Chen; Chin-Pao Huang; Cheng-Di Dong

doi:10.1016/j.biortech.2023.129047

Pyrolysis processes affecting polycyclic aromatic hydrocarbon profile of pineapple leaf biochar exemplified by atmosphere/temperature and heteroatom doping

Bioresour Technol. 2023 Jul:379:129047. doi: 10.1016/j.biortech.2023.129047. Epub 2023 Apr 12.

Authors

Chang-Mao Hung¹, Jia-Wei Cheng², Chiu-Wen Chen³, Chin-Pao Huang⁴, Cheng-Di Dong⁵

Affiliations

¹ Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan; Institute of Aquatic Science and Technology, College of Hydrosphere Science, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan. Electronic address: hungcm@nkust.edu.tw.
² Institute of Aquatic Science and Technology, College of Hydrosphere Science, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
³ Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan.
⁴ Department of Civil and Environmental Engineering, University of Delaware, Newark, USA.
⁵ Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan; Institute of Aquatic Science and Technology, College of Hydrosphere Science, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan. Electronic address: cddong@nkust.edu.tw.

PMID: 37059342
DOI: 10.1016/j.biortech.2023.129047

Abstract

The content of polycyclic aromatic hydrocarbons in pineapple leaf biochar was examined as a function of pyrolysis atmosphere (CO₂ or N₂), pyrolysis temperature (300-900 °C), and heteroatom (N, B, O, P, NP, or NS) doping. Without doping, the polycyclic aromatic hydrocarbon production was maximal (1332 ± 27 ng/g) in CO₂ at 300 °C and minimal (157 ± 2 ng/g) in N₂ at 700 °C. The main components naphthalene and acenaphthylene accounted for about 91% of the total polycyclic aromatic hydrocarbon in the biochar prepared under CO₂ at 300 °C. Under the maximal polycyclic aromatic hydrocarbon production conditions (CO₂, 300 °C), doping decreased the total hydrocarbon content by 49% (N), 61% (B), 73% (O), 92% (P), 93% (NB), and 96% (NS). The results shed new light on the management of polycyclic aromatic hydrocarbons in BC production by controlling the pyrolysis atmosphere and temperature in addition to heteroatom doping. Results significantly contributed to the development of circular bioeconomy.

Keywords: Biochar; Heteroatom doping; Pineapple leaf; Polycyclic aromatic hydrocarbon; Pyrolysis.

MeSH terms

Ananas*
Atmosphere
Carbon Dioxide
Charcoal
Polycyclic Aromatic Hydrocarbons*
Pyrolysis
Temperature

Substances

Polycyclic Aromatic Hydrocarbons
biochar
Carbon Dioxide
Charcoal