Journal
ENVIRONMENTAL RESEARCH
Volume 184, Issue -, Pages -Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2020.109324
Keywords
Chinese medicinal herb residue; Adsorption mechanism; Functional groups; Pore-filling; H/C ratio
Funding
- Pearl River S&T Nova Program of Guangzhou, China [201610010131]
- National Natural Science Foundation of China [41401353, 41571313, 41807454, 21577131]
- Natural Science Foundation of Guangdong Province, China [2015A030313570, 2016A030313772, 2017A030311019]
- Department of Science and Technology of Guangdong Province, China [2017B020203002, 2016B070701009, 2016A020210034]
- President Foundation of Guangdong Academy of Agricultural Sciences, China [201716]
- Special fund for scientific innovation strategy-construction of high level Academy of Agriculture Science [R2016PYQY010, R2016PY-JX006]
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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.
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