Journal
BIORESOURCE TECHNOLOGY
Volume 303, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.122947
Keywords
Macroalgae; Porous graphitized structure; N-doping; Biochar; Polycyclic aromatic hydrocarbons; Water treatment
Funding
- National Key Research and Development Program of China [2017YFD0800704]
- National Natural Science Foundation of China [41877032, 41671236]
- Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDJ-SSW-DQC035]
- Opening Fund of National Engineering Laboratory for Site Remediation Technologies [NEL-SRT201904]
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Enhanced macroalgal biochars with large specific surface areas (up to 399 m(2) g(-1)), partly graphitized structure, high nitrogen doping (up to 6.14%), and hydrophobicity were fabricated by co-carbonization of macroaglae, ferric chloride, and zinc chloride. These biochars were used as sorbents for the removal of polycyclic aromatic hydrocarbons from water. The sorption capacity of polycyclic aromatic hydrocarbons onto macroalgal biochars was high (up to 90 mg g(-1)), and recycling by thermal desorption was practicable. We revealed the physical-dominated multilayer sorption process, based on results from characterization and sorption experiments. Pore filling, mass transfer, pi-pi stacking, and the partition effect were found to be possible sorption mechanisms. This study suggests that porous graphitized nitrogen-doped biochars may be synthesized from macroalgae with simple one-pot carbonization and display promising applicability for sorption removal of organic pollutants from water.
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