Abstract
Biochar has attracted much attention, which owns many environmental and agronomic benefits, including carbon sequestration, improvement of soil quality, and immobilization of environmental contaminants. Biochar has been also investigated as an effective sorbent in recent publications. Generally, biochar particles can be divided into colloids and residues according to particle sizes, while understanding of adsorption capacities towards organic pollutants in each section is largely unknown, representing a critical knowledge gap in evaluations on the effectiveness of biochar for water treatment application. Scanning electron microscopy (SEM) images, X-ray diffraction (XRD), Raman spectra, Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) method are used to examine the structures and surface properties of biochar colloids and residues derived from corn straws prepared at different pyrolysis temperatures. Also, their roles in atrazine (a typical organic pollutant) removal are investigated by batch adsorption experiments and fitted by different kinetic and thermodynamic models, respectively. The adsorption capacities of biochar colloids are much more than those of residues, resulting from the colloids containing abundant oxygen functional groups and mineral substances, and the adsorption capacities of biochar colloids and residues increase with the increase of pyrolysis temperatures. The highest adsorption performance of 139.33 mg g−1 can be obtained in biochar colloids prepared at 700 °C, suggesting the important functions of biochar colloids in the application of atrazine removal by biochar.
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Funding
We gratefully acknowledge the financial support of this research by the National Nature Science Fund for Young Scholars (31600413), the National Nature Science Fund for Distinguished Young Scholars (41625002), the MOA Modern Agricultural Talents Support Project, the China Postdoctoral Science Foundation (2017T100222 and 2015M581417), the Heilongjiang Postdoctoral Fund (LBH-Z15012 and LBH-TZ1603), and “Young Talents” Project of Northeast Agricultural University (16QC34 and 17XG03).
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Yang, F., Gao, Y., Sun, L. et al. Effective sorption of atrazine by biochar colloids and residues derived from different pyrolysis temperatures. Environ Sci Pollut Res 25, 18528–18539 (2018). https://doi.org/10.1007/s11356-018-2077-0
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DOI: https://doi.org/10.1007/s11356-018-2077-0