Designing nanofibrous membrane with biomimetic caterpillar-like structured for highly-efficient and simultaneous removal of insoluble emulsified oils and soluble dyes towards sewage remediation

Shuangshuang Li; Yi He; Liyun Zhang; Jianbo Li; Yiling Nie; Hongjie Li; Xiangying Yin; Yang Bai

doi:10.1016/j.jhazmat.2021.125442

Designing nanofibrous membrane with biomimetic caterpillar-like structured for highly-efficient and simultaneous removal of insoluble emulsified oils and soluble dyes towards sewage remediation

J Hazard Mater. 2021 Jul 15:414:125442. doi: 10.1016/j.jhazmat.2021.125442. Epub 2021 Feb 17.

Authors

Shuangshuang Li¹, Yi He², Liyun Zhang³, Jianbo Li⁴, Yiling Nie¹, Hongjie Li¹, Xiangying Yin¹, Yang Bai⁵

Affiliations

¹ State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China.
² State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China. Electronic address: chemheyi@swpu.edu.cn.
³ State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, PR China; College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China. Electronic address: 1042924616@qq.com.
⁴ College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, PR China. Electronic address: ljb0418@163.com.
⁵ State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, PR China.

PMID: 33662794
DOI: 10.1016/j.jhazmat.2021.125442

Abstract

Purification of insoluble emulsified oils and soluble organic pollutants from sewage has attracted tremendous attention in today's society. Herein, a stable and environmentally friendly nanofibrous membrane with hierarchical caterpillar-like structure was fabricated via in-situ hydrothermal growing the nickel-cobalt layered double hydroxides (NiCo-LDHs) on tche polyacrylonitrile (PAN) electrospun nanofibers. The wrapped hydrophilic NiCo-LDHs constructed the hierarchical structure and endowed the membrane attractive superhydrophilicity (≈ 0°)/underwater superoleophobicity (≈ 161°) and enhanced oil-repellency performance. Meanwhile, the NiCo-LDH@PANI/oPAN NFMs can display the ultra-fast flux of SSEs (xylene/water emulsion, 4175 L m^-2 h^-1) and satisfactory separation efficiency (99.07%). Moreover, the introduction of positively charged NiCo-LDHs increased plentiful adsorption active sites for membranes, which is beneficial to demulsify ionic SSEs and adsorb organic pollutants. Finally, for simultaneous purification of complex sewage by the dead-end and cross-flow filtration experiment, the composite membrane both displayed splendid removal rate of oil (> 99.0%) and dyes (> 99.0%), robust regeneration recycle-ability and no secondary pollution. Hence, it is expected that such strategy of combining electrospun and chelating-assisted in-situ hydrothermal can provide a low energy consumption and high decontamination technology for severe environmental crisis.

Keywords: Adsorption of dyes; Mesoporous structure; Nanofibrous membrane; Nickel cobalt layered double hydroxides; Oil/water emulsions separation.

Publication types

Research Support, Non-U.S. Gov't