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High-strength and low-swelling chitosan/cellulose microspheres as a high-efficiency adsorbent for dye removal

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Abstract

Dye contamination of water supplies has a serious threat to human health, prompting the development of highly effective and eco-friendly adsorbents. In this work, polyelectrolyte microspheres derived from positively charged chitosan and negatively charged cellulose were constructed in alkali/urea solvent by a simple water/oil emulsification. The obtained chitosan/cellulose microspheres (CCM) were further used for the removal of reactive black 5. By using alkali/urea solution as the solvent, a homogeneous chitosan/cellulose solution was achieved, which avoided the easy occurrence of agglomeration between oppositely charged polymers. More importantly, CCM showed significantly improved mechanical strength and anti-swelling properties compared with pure chitosan microspheres (CM). Adsorption experiments demonstrated that CCM can effectively remove reactive black 5 with high adsorption capacity of 214.36 mg/g, fast adsorption kinetic that reached 76% of the equilibrium adsorption amount within only 20 min, and good reusability that maintained 75% efficiency even after five times of adsorption/desorption cycle, indicating a great potential for the application of dye removal.

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Acknowledgments

The work was funded by Natural Science Foundation of China (21676170). We thank Shuping Zheng (Analytical & Testing Center, Sichuan University) for her help in SEM observations. We also thank Yanping Huang from Center of Engineering Experimental Teaching, School of Chemical Engineering, Sichuan University for the help of SEM image.

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Correspondence to Kaifeng Du.

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Qiao, L., Wang, S., Wang, T. et al. High-strength and low-swelling chitosan/cellulose microspheres as a high-efficiency adsorbent for dye removal. Cellulose 28, 9323–9333 (2021). https://doi.org/10.1007/s10570-021-04111-2

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  • DOI: https://doi.org/10.1007/s10570-021-04111-2

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