Closed pore structured NiCo2O4-coated nickel foams for stable and effective oil/water separation

Yan Li, Xi Zheng, Zhanheng Yan, Dongliang Tian, Jianmin Ma, Xiaofang Zhang, Lei Jiang

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)

Abstract

To solve the serious problem caused by oily wastewater pollution, unique interface designs, for example, membranes with superwetting properties such as superhydrophobicity/superoleophilicity and superhydrophilicity/underwater superoleophobicity, provide a good way to achieve oil/water separation. Here, inspired by the liquid storage property of the honeycomb structure, we propose a strategy to fabricate NiCo2O4-coated nickel foams for stable and efficient oil/water separation. NiCo2O4 with a closed-pore structure was formed by assembling nanoflakes with a micro/nanoscale hierarchical structure. Compared with nickel foam coated by NiCo2O4 with an open-pore structure (NiCo2O4 nanowires), the enclosed nanostructure of NiCo2O4 nanoflakes can firmly hold water for a more stable superhydrophilic/underwater superoleophobic interface. As a consequence, the NiCo2O4-nanoflake-coated nickel foam has a larger oil breakthrough pressure than the NiCo2O4-nanowire-coated nickel foam because of a slightly larger oil advancing angle and a lower underwater oil adhesion force, which makes it more stable and efficient for oil/water separation. Moreover, the NiCo2O4-coated nickel foams have excellent chemical and mechanical stability, and they are reusable for oil-water separation. This work will be beneficial for the design and development of stable underwater superoleophobic self-cleaning materials and related device applications, such as oil/water separation.

Original languageEnglish
Pages (from-to)29177-29184
Number of pages8
JournalACS Applied Materials & Interfaces
Volume9
Issue number34
DOIs
Publication statusPublished - 30 Aug 2017
Externally publishedYes

Keywords

  • closed-pore structure
  • micro/nanoscale hierarchical structure
  • superwetting
  • underwater superoleophobic
  • water/oil separation

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