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Durable superhydrophobic cotton fabric from cardanol/POSS-based polybenzoxazine for high-efficiency oil/water separation

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Abstract

Using biomass resources to develop high-performance superhydrophobic materials that can effectively separate oily wastewater has become an urgent demand. Herein, a novel biomass-based benzoxazine (C-aPOSS) from cardanol and aminopropyllsobutyl-POSS was designed and synthesized, and superhydrophobic cotton fabric (PC-aPOSS/CF) was constructed by dipping cotton fabric in C-aPOSS solution and then polymerizing in situ. The PC-aPOSS/CF exhibited high water contact angle of 155.0° ± 0.3° as well as excellent mechanical and chemical resistance. Due to its super-wettability and porosity, the superhydrophobic PC-aPOSS/CF possessed high separation performance for various oil/water mixtures with oil purities higher than 99.86% and oil fluxes above 3600 L·m−2·h−1. Furthermore, the superhydrophobic PC-aPOSS/CF and polyurethane sponge were used to prepare sandwich-like composite filter membrane for separating surfactant-free and surfactant-stabilized water-in-oil emulsions. The composite filter membrane exhibited oil purity greater than 99.93% and ultrahigh oil flux of over 127,289 L m−2 h−1 bar−1 in separating surfactant-free water-in-oil emulsions, and oil purity lager than 99.87% and oil flux higher than 17,895 L m−2 h−1 bar−1 in separating surfactant-stabilized water-in-oil emulsions. After operating 50 separation cycles of surfactant-free water-in-trichloromethane emulsion, oil purity was still above 99.99%, which indicates the outstanding recyclability of the composite filter membrane. Therefore, the development of high performance superhydrophobic PC-aPOSS/CF may provide a route to the oily wastewater treatment and oil purification.

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Acknowledgments

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (31700522 and 31901256), and Forestry Science and Technology Innovation and Extension Project of Jiangsu Province (LYKJ[2021]04).

Funding

The funding was provided by National Natural Science Foundation of China, 31700522, Qianqian Shang, 31901256,Caiying Bo, Forestry Science and Technology Innovation and Extension Project of Jiangsu Province, LYKJ[2021]04, Lihong Hu.

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Correspondence to Chengguo Liu, Xiaohui Yang or Yonghong Zhou.

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Shang, Q., Cheng, J., Bo, C. et al. Durable superhydrophobic cotton fabric from cardanol/POSS-based polybenzoxazine for high-efficiency oil/water separation. Cellulose 29, 6425–6440 (2022). https://doi.org/10.1007/s10570-022-04638-y

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  • DOI: https://doi.org/10.1007/s10570-022-04638-y

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