Converting metal-organic framework particles from hydrophilic to hydrophobic by an interfacial assembling route

Zhang, Fanyu; Sang, Xinxin; Tan, Xiuniang; Liu, Chengcheng; Zhang, Jianling; Luo, Tian; Liu, Lifei; Han, Buxing; Yang, Guanying; Binks, Bernard P.

Abstract

Here we propose to modify the hydrophilicity of metal-organic framework (MOF) particles by an interfacial assembling route, which is based on the surface-active nature of MOF particles. It was found that hydrophilic UiO-66-NH₂ particles can be converted to hydrophobic particles through an oil-water interfacial assembling route. The underlying mechanism for the conversion of UiO-66-NH₂ was investigated by X-ray photoelectron spectroscopy and FT-IR spectroscopy. It was revealed that the close assembly of UiO-66-NH₂ particles at the oil-water interface strengthens the coordination between organic ligands and metal ions, which results in a decrease in the proportion of hydrophilic groups on UiO-66-NH₂ particle surfaces. Hydrophobic UiO-66-NH₂ particles show improved adsorption capacity for dyes in organic solvents compared with pristine UiO-66-NH₂ particles. It is expected that the interfacial assembling route can be applied to the synthesis of different kinds of MOF materials with tunable hydrophilicity or hydrophobicity required for diverse applications.

Citation

Zhang, F., Sang, X., Tan, X., Liu, C., Zhang, J., Luo, T., Liu, L., Han, B., Yang, G., & Binks, B. P. (2017). Converting metal-organic framework particles from hydrophilic to hydrophobic by an interfacial assembling route. Langmuir : the ACS journal of surfaces and colloids, 33(43), 12427-12433. https://doi.org/10.1021/acs.langmuir.7b02365

• Journal Article Type: Article
• Acceptance Date: Oct 1, 2017
• Online Publication Date: Sep 30, 2017
• Publication Date: Oct 31, 2017
• Deposit Date: Oct 16, 2017
• Publicly Available Date: Oct 4, 2018
• Journal: Langmuir
• Print ISSN: 0743-7463
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 33
• Issue: 43
• Pages: 12427-12433
• DOI: https://doi.org/10.1021/acs.langmuir.7b02365
• Keywords: Emulsion, Interfacial assembling, Metal-organic framework, Hydrophilic, Hydrophobic
• Public URL: https://hull-repository.worktribe.com/output/474528
• Publisher URL: http://pubs.acs.org/doi/abs/10.1021/acs.langmuir.7b02365
• Additional Information: This is a description of an article published in Langmuir, 2017.
• Contract Date: Oct 16, 2017