posted on 2019-10-25, 18:20authored byTao Bao, Ying Su, Nan Zhang, Yan Gao, Sicen Wang
Immobilization
of metal–organic frameworks (MOFs) on multiple
substrates is important and challenging in functional materials fields
till date. Cotton is a promising carrier material with excellent performance,
such as large specific area, mechanical strength and stability, good
biocompatibility, and hygroscopicity. In this study, based on the
coordination of carboxyl groups and Zr-OH groups, a novel carboxyl
cotton chelator-zirconium-based metal–organic framework (CCC@Zr-MOF)
was successfully fabricated. The surface of the cotton was first modified
by citric acid. Zr-MOF precursor was grown on the carboxyl modified
cotton by coordination bond to prepare Zr6O4(OH)4 cluster modified cotton (CCC@Zr6O4(OH)4). Then, Zr-MOF would form and immobilize
on CCC@Zr6O4(OH)4 to obtain CCC@Zr-MOF.
The CCC@Zr-MOF was characterized by field emission scanning electron
microscope equipped with an energy-dispersive X-ray spectrometer,
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray
photoelectron spectra, and Brunauer–Emmett–Teller. The
successful formation of Zr-MOF on the surface of cotton has been demonstrated.
CCC@Zr-MOF was packed in the pipette tip for the solid-phase extraction
to evaluate its adsorption property for phenolic acid compounds from
complex matrix sample. The results showed that CCC@Zr-MOF performed
an efficient adsorption and selectivity.