Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 421, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.126739
Keywords
Biochar-derived DOM; Pyrolysis temperature; Adsorption; Cu(II); Complexation
Categories
Funding
- Science and Technology Major Project of Sichuan Province [2018SZDZX0024]
- Project Funding of Chengdu University of Information Technology [KYTZ201744]
- Key Research and Development Project of Science and Technology Department of Sichuan Province [2021YFG0267]
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The structure and composition of biochar-derived dissolved organic matter varied significantly at different pyrolysis temperatures, impacting the binding properties of Cu(II) onto walnut-shell DOM. The preferential Cu(II) binding with fulvic-like and protein-like substances at different temperatures were observed, suggesting that pyrolysis temperature plays a crucial role in heavy metal behavior. The presence of DOM influenced the adsorption behavior of biochar towards Cu(II).
The structure and composition of biochar-derived dissolved organic matter (DOM) at different pyrolysis temperatures differed significantly, affecting the environmental geochemical behavior of heavy metals (HMs). Herein, the binding properties of Cu(II) onto walnut-shell DOM were investigated using spectroscopic methods. The results showed that the DOM at low pyrolysis temperatures (300 degrees C and 500 degrees C) showed higher Cu(II) affinity than that at high pyrolysis temperature (700 degrees C). There was a preferential Cu(II) binding with fulvic-like substances (360 nm) at 300 degrees C, and with protein-like materials (275 nm) at 500 degrees C and 700 degrees C. The C- O group of alcohols, ethers, and esters showed preferential binding with Cu(II) at 300 degrees C and 700 degrees C pyrolysis temperatures. However, preferential bonding of Cu(II) to the C-O stretching vibration and O-H bending vibration of carboxyl was exhibited at 500 degrees C pyrolysis temperature. Pyrolysis temperature played a crucial role in the release of biochar-derived DOM and in the migration and bioavailability of HMs. Meanwhile, the adsorption effect of Cu(II) increased by 11.2% for biochar at 300 degrees C, and decreased by 15.0% and 61.1% for biochar at 500 degrees C and 700 degrees C, respectively, after the removal of DOM, suggesting that the presence of DOM influenced the adsorption behavior of biochar towards Cu(II).
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