Abstract
The removal and recovery of phosphate from water using adsorption technology require that the adsorbent material is easily separable from treated water. Continuous efforts are still awaited to develop additional efficient phosphate adsorbents that are economical to fabricate. In this study, hydrous zirconia-impregnated chitosan beads (HZCB) containing different Zr/chitosan ratios were synthesized using a facile scheme. We found that HZCB with a Zr/amine molar ratio of ~ 1 (HZCB-1) possessed excellent stability and phosphate removal performance. This optimized material was characterized with XRD, SEM, FTIR, XPS, specific surface area and point of zero charge measurements. The maximum adsorption capacity was 42.02 mg/g (at pH ~ 6.7). The adsorption kinetics were best described by a pseudosecond-order model, and the rate constant of HZCB-1 was much lower than that of its powder but was similar to the commercial bead product Ferrolox. The removal of phosphate depended substantially upon pH and was enhanced by lowering the pH. Good selectivity of HZCB-1 for phosphate was observed, although the coexistence of sulfate produced a significant negative effect. Direct coordination of phosphate to Zr atoms by replacing hydroxyls was the dominant adsorption mechanism (~ 85%), while chitosan also contributed to phosphate removal (~ 15%). Adsorbed phosphate was successfully eluted by an NaOH solution, and the material obtained after desorption and regeneration was able to be repeatedly used. The results of column studies indicated that this material could be implemented in long-term application.
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Acknowledgments
The authors gratefully acknowledge the financial support from the National Natural Science Foundation Project (52170166) and the HITACHI Chemical Co., Ltd (Grant No 2020-07).
Funding
This work was funded by the National Natural Science Foundation of China (Grant No. 52170166) and the HITACHI Chemical Co., Ltd of Japan (Grant No. 2020-07).
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ZZ: conceptualization, investigation, writing-original draft; TL: investigation, validation; DW: supervision, writing-reviewing and editing.
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Zhang, Z., Liu, T. & Wu, D. Facile synthesis of hydrous zirconia-impregnated chitosan beads as a filter medium for efficient removal of phosphate from water. Cellulose 29, 8749–8768 (2022). https://doi.org/10.1007/s10570-022-04813-1
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DOI: https://doi.org/10.1007/s10570-022-04813-1