Abstract
A heavy metal ion adsorbent (HFPANF) with high surface area was obtained from polyacrylonitrile fibers with fibrillation and alkali hydrolysis, and an activated carbon fiber filter was prepared by using HFPANF as the binder. The surface area of polyacrylonitrile was 48.64 m2/g due to fibrillation, which also led to the carboxyl content of the HFPANF up to 3.4 mmol/g. Batch adsorption experiments on Cu2+ and Pb2+ showed that the adsorption capacities of HFPANF for Cu2+ and Pb2+ were 47.5 mg/g and 54.3 mg/g. The adsorption kinetics showed that the adsorption reached equilibrium at 90 min and that the adsorption followed the pseudo-second order model. It indicates that the adsorption process is chemisorption. HFPANF formed a single tooth chelate with Cu and a double tooth chelate with Pb. HFPANF-ACF filter was prepared by wet molding technique. When the HFPANF content was 30%, the filter reached a compressive strength of 15.37 MPa and its maximum flux was 180 L/h. 2.5 mg/L of Cu and Pb were used for dynamic adsorption experiments and the heavy metal removal rate was still above 95% after filtering 600 L. The pressure drop of HFPANF-ACF filter was much smaller compared with that of GAC filter due to the combined effect of fibrillated nanofibers and ACF, which can improve the filtration efficiency of the filter.
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All authors contributed to the study conception and design, material preparation, data collection and analysis, writing & editing of the manuscript were performed by Yuanhuo Ji; review and editing of the manuscript were performed by Xiwen Wang. All authors read and approved the final manuscript.
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Highlights
• Fibrillation increases the surface area and degree of alkaline hydrolysis of PANF.
• Micronanofibers and carboxyl improve the compressive strength of filter.
• High carboxyl content of the filter can effectively remove heavy metal ions.
• 3D structure of micronanofibers reduce the pressure drop of the filter.
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Ji, Y., Wang, X. Purification performance of modified polyacrylonitrile fiber–activated carbon fiber filter for heavy metal ions. Environ Sci Pollut Res 30, 23372–23385 (2023). https://doi.org/10.1007/s11356-022-23833-9
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DOI: https://doi.org/10.1007/s11356-022-23833-9