Robust super-hydrophobic/super-oleophilic sandwich-like UIO-66-F4@rGO composites for efficient and multitasking oil/water separation applications

Yingqing Zhan; Shuangjiang He; Jiaxin Hu; Shumei Zhao; Guangyong Zeng; Mi Zhou; Guiyuan Zhang; Arijit Sengupta

doi:10.1016/j.jhazmat.2019.121752

Robust super-hydrophobic/super-oleophilic sandwich-like UIO-66-F₄@rGO composites for efficient and multitasking oil/water separation applications

J Hazard Mater. 2020 Apr 15:388:121752. doi: 10.1016/j.jhazmat.2019.121752. Epub 2019 Nov 24.

Authors

Yingqing Zhan¹, Shuangjiang He², Jiaxin Hu², Shumei Zhao³, Guangyong Zeng⁴, Mi Zhou³, Guiyuan Zhang³, Arijit Sengupta⁵

Affiliations

¹ College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China; State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China; Research Institute of Industrial Hazardous Waste Disposal and Resource Utilization, Southwest Petroleum University, Chengdu, Sichuan 610500, PR China. Electronic address: 201599010032@swpu.edu.cn.
² College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China; State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China.
³ College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu, Sichuan 610500, PR China.
⁴ College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, 610059, China.
⁵ Radiochemsitry Division, Bhabha Atomic Research Center, Mumbai, 400094, India.

PMID: 31796368
DOI: 10.1016/j.jhazmat.2019.121752

Abstract

Super-wetting MOFs@graphene hybrid has shown promising application for oil/water separation, due to high porosity, low density, and controllable wettability, however, achieving excellent stability and recyclability are found to be still challenging. In this study, sandwich-like UIO-66-F₄@rGO hybrid was synthesized by immobilization of UIO-66-F₄ nanoparticles on rGO matrix, which featured the unique micro/nano hierarchy with hydrophobic characteristics. In order to realize the oil/water separation, as-prepared sandwich-like UIO-66-F₄@rGO hybrid was applied as a potential candidate for constructing robust super-hydrophobic/super-oleophilic interfaces by using filter paper (FP) and melamine sponge (MS) as substrates. Typically, the surface modification of substrates can be easily achieved by simple dip-coating method, and interfacial adhesion between substrates and UIO-66-F₄@rGO was enhanced by cross-linking of hydroxyl-fluoropolysiloxane (FPSO). Consequently, the super-hydrophobic/oleophilic UIO-66-F₄@rGO/FP exhibited high contact angle of 169.3 ± 0.6° and was capable of separating various water-in-oil emulsions effectively. The flux and separation efficiency were 990.45 ± 36.28 Lm^-2 h^-1 and 99.73 ± 0.19 % driven by gravity, respectively. The super-hydrophobic/super-oleophilic UIO-66-F₄@rGO/MS possessed selective oil absorption with absorption capacity of 26∼61 g/g depending on the viscosity of oils and continuous cleaning of oil spill. Furthermore, the UIO-66-F₄@rGO composite could tolerate high/low temperature, corrosive solutions, and physical damage, displaying robust and stable super-hydrophobic/super-oleophilic interfaces for treating oily wastewater in harsh environments.

Keywords: Durability; Metal-organic frameworks; Oil-water separation; Reduced graphene oxide; Super-hydrophobic/super-oleophilic property.

Publication types

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