The ratio of H/C is a useful parameter to predict adsorption of the herbicide metolachlor to biochars
- Authors
- Wei, Lan; Huang, Yufen; Huang, Lianxi; Li, Yanliang; Huang, Qing; Xu, Guizhi; Muller, Karin; Wang, Hailong; Ok, Yong Sik; Liu, Zhongzhen
- Issue Date
- 5월-2020
- Publisher
- ACADEMIC PRESS INC ELSEVIER SCIENCE
- Keywords
- Chinese medicinal herb residue; Adsorption mechanism; Functional groups; Pore-filling; H/C ratio
- Citation
- ENVIRONMENTAL RESEARCH, v.184
- Indexed
- SCIE
SCOPUS
- Journal Title
- ENVIRONMENTAL RESEARCH
- Volume
- 184
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/56071
- DOI
- 10.1016/j.envres.2020.109324
- ISSN
- 0013-9351
- Abstract
- Biochar adsorbent was produced by pyrolyzing traditional Chinese medicinal herb residue at 300, 500 and 750 degrees C (referred to as biochar-300, biochar-500 and biochar-750). Basic physical and chemical analyses, Fourier transform infrared spectroscopy (FT-IR), and thermodynamic analyses were performed to elucidate adsorption and properties of biochar. Biochar adsorption capacity of herbicide metolochlor, as measured by batch-type adsorption experiments by Freundlich constant K-f (mg(1-n) L-n kg(-1)), followed the order: biochar-750 > biochar300 > biochar-500. Thermodynamic analysis suggested that adsorption of metolachlor on biochar was a spontaneous process. The adsorption isotherm for the biochar produced at the highest pyrolysis temperature was characteristic for adsorption process driven by a high surface area of biochar (85.30 m(2) g(-1)), while the adsorption process for the biochar produced at the lowest temperature was controlled by its higher content of organic matter (39.06%) and abundant functional groups. The FT-IR spectra also showed that the biochar prepared at the lowest temperature had the highest number of surface groups. In general, pore-filling induced by the large surface area of the biochar was the dominant adsorption mechanism. When the H/C value was > 0.5, the adsorption mechanism of biochar was dominated by surface chemical bond, while pore-filling played a major role when the H/C value was < 0.5.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.