Abstract
Application of biochar to treat heavy metal polluted wastewater has received increasing attention. However, the adsorption ability of biochar for metal metals is still limited. Ionic liquid (IL) is an organic solvent, which is regarded to have catalysis on biomass during pyrolysis. In this study, a representative IL, 1-butyl-2,3-dimethylimidazolium triflate was selected to co-pyrolysis with wastepaper to acquire biochars with high removal rates for Cu2+. Meanwhile, the enhancement mechanisms by IL were clarifed, and the effects of pyrolysis temperature and CaCO3 in biomass on IL modification were explored. Results showed IL increased micropores of biochar, enhanced the functional groups such as -OH, CO32- and C-O on biochar surface, meanwhile generated CaF2 crystals. Compared to 350°C and 600°C, the IL-modified biochar produced at 700°C showed the highest removal rate of Cu2+, close to 100%. The adsorption mechanisms of IL-modified biochar on Cu2+ were that porous structure of IL-modified biochar provided enough adsorption sites, and the F- from IL reacted with Cu2+ to form CuF2 precipitation. CaCO3 in biomass weakened the modification effect of IL by isolation the organic component of biomass with IL. This study proposed an innovative method to produce biochars with highly efficient removal rate of Cu2+, which was of great significance to control heavy metal pollution in water bodies.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Science and Technology Commission of Shanghai Municipality (No.22dz1209402), and the Open Funding of State Environmental Protection Engineering Center for Urban Soil Contamination Control and Remediation (No.USCR-202201).
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All authors contributed to the study conception and design. FY and JYC performed the experiment; YJW and XYL contributed to analysis and manuscript preparation; YL and XPZ performed the data analyses and wrote the manuscript; JKSM helped perform the analysis with constructive discussions. All authors read and approved the final manuscript. All authors read and approved the final manuscript.
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Yang, F., Cui, J., Wang, Y. et al. Ionic Liquid-Assisted Production of Biochar with High Cu2+ Removal Efficiency: Effect of Pyrolysis Temperature and CaCO3 Content in Biomass. Water Air Soil Pollut 235, 282 (2024). https://doi.org/10.1007/s11270-024-07091-8
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DOI: https://doi.org/10.1007/s11270-024-07091-8