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Fabrication of hierarchical porous MgO/cellulose acetate hybrid membrane with improved antifouling properties for tellurium separation

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Abstract

Considerable toxic tellurium-containing wastewater has been discharged into water environment and constantly accumulates, due to the widespread applications but low utilization of tellurium, causing irreversible harm to the environment and human health, thus it is crucial to find an efficient strategy for tellurium separation. Herein, hierarchical porous magnesium oxide modified cellulose acetate membranes (MgO@CAM) were prepared via a facile physical blending and phase inversion method for tellurium separation. Diverse characterization methods and batch separation experiments were conducted to investigate the morphological structure of MgO@CAM, tellurium separation mechanism, and the separation behavior under different influencing factors. The results exhibit that MgO@CAM has a hierarchical porous structure and a hydroxyl-rich surface, which facilitates the separation of tellurium. Besides, MgO@CAM reveals eligible regeneration performance, good stability and thermal stability due to the hydrogen bonding and skeletal structure of cellulose acetate. The study on the effect of pH suggests that an acidic environment is more conducive to the separation of tellurium by MgO@CAM, and the prepared membranes show outstanding separation efficiency of tellurium, with a maximum of 97.6%. Furthermore, the membranes also achieve satisfactory separation efficiency of tellurium in the presence of multiple coexisting ions. Thomas dynamics indicate the practical application of MgO@CAM in tellurium separation. More importantly, prominent hydrophilic enables MgO@CAM to demonstrate excellent antifouling performance. Therefore, the preparation of hierarchical porous MgO@CAM provides an efficient and economic strategy for tellurium separation in wastewater and has promising applications in water treatment.

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Acknowledgments

This work was financially supported by the China Postdoctoral Science Foundation (2020M 681740 and 2021T140578), National Natural Science Foundation of China (21706100 and 21878132), Natural Science Foundation of Hebei Province (B2019108017 and E2021108005), Scientific and Technical Research project of the Higher Education Institutions of Hebei Province (QN2020226), and Non-Ferrous Metals and Material Processing New Technology Key Laboratory of Ministry of Education/Guangxi Key Laboratory of Optoelectronic Materials and Devices (20 KF-27).

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Correspondence to Fengxian Qiu or Tao Zhang.

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Shao, X., Chen, X., Qiu, Z. et al. Fabrication of hierarchical porous MgO/cellulose acetate hybrid membrane with improved antifouling properties for tellurium separation. Cellulose 28, 10549–10563 (2021). https://doi.org/10.1007/s10570-021-04207-9

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  • DOI: https://doi.org/10.1007/s10570-021-04207-9

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