Dual-functional mesh with Zn-Ni-Co LDHs@NiMoO4 heterojunction nanoarrays for highly efficient oil/water separation and photocatalytic degradation

Sun, Yongli Li, Jingshuai Zhang, Luhong Jiang, Bin Yang, Xiaodong Yang, Na Peng, Feifei Xu, Mi Xiao, Xiaoming*

School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People’s Republic of China

Received 18 September 2020, Revised 12 November 2020, Accepted 22 November 2020, Available online 29 November 2020.


In view of the serious water pollution issue, a kind of environmentally friendly, dual-functional, energy-efficient and low-cost superwetting material is urgently prepared for oil/water separation and the degradation of dyes in wastewater. In our work, dual-functional Zn-Ni-Co LDH@NiMoO4 nanoarrays (ZNC-NM) with porous core-shell structure were constructed on the stainless steel mesh (SSM) via a facile two-step hydrothermal method. The coated mesh exhibited favorable superhydyophilicity and underwater superoleophobicity with underwater oil contact angle (OCA) of 164.9°. Meanwhile, the as-prepared mesh possessed ultrahigh separation efficiency and high permeation flux for a series of oil/water mixtures. In addition, the good anti-fouling and self-cleaning property enabled the separation efficiency remain above 99.90% after 60 separation recycles. By virtue of good stability and anti-corrosive property, there were no remarkable alterations in the separation efficiency and underwater OCA of the designed mesh in harsh environments. More importantly, the NiMoO4 nanosheets anchored on Zn-Ni-Co LDH with the visible light responsiveness demonstrated favorable photocatalytic performance, which could efficiently degrade organic dyes in wastewater. Therefore, the dual-functional mesh coated with ZNC-NM nanoarrays based on this facile strategy is a promising material for oil/water separation and photocatalysis, owning great application potential in wastewater remediation.

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