Jiang Yanxiao,Song Wei,Zhang Meng,Feng Yu,Liu Boyan,Zhang Hong,Kan Guangfeng,Yu Kai,Jiang Jie
In this study, metal–organic framework (MOF)-functionalized sponge columns were prepared using a simple approach by embedding melamine sponge in a homogeneous MOF solution and first applied in the removal of methyl orange dye from water samples. Various MOF materials (MIL-101(Cr), MIL-101(Fe), ZIF-8(Zn), HKUST-1(Cu), and MIL-68(Al)) with different structures were synthesized and used as coating materials for a blank sponge. This method not only can be used for a wide variety of MOF materials, but also can retain their unique properties. The results show that the sponge as an adsorbed base material can effectively simplify the separation procedures of adsorption. Under the optimal conditions, the prepared MOF/PVDF-sponge column had an excellent adsorption capacity (229.4 mg g −1 ) toward methyl orange and reached the equilibrium within 1 h. With simple one-step infiltration, excellent adsorption properties and simple operation, the MOF/PVDF-sponge column presents a promising commercial value. Moreover, this study provides a new approach for exploring functional porous sponges for adsorption of dyes from environmental water samples.
Yanxiao Jiang,Zucheng Qin,Fanghui Liang,Jingkang Li,Ying Sun,Xinghua Wang,Pinyi Ma,Daqian Song
In the presented work, MIL-101(Cr) and chitosan were directly embedded on the skeleton of melamine sponge material using a simple and environmentally friendly method. Chitosan acts not only as an adhesive during the preparation of functionalized sponges, but also as an adsorption adjuvant in herbicide detection. Unlike other polymers, chitosan has excellent hydrophilicity and contains numerous adsorption sites; thus, it enables the sponge material to be used for determination of contaminants in an aqueous phase. Scanning electron microscopic (SEM) analysis showed that the coating material was uniformly distributed on the skeleton of melamine sponge. The prepared material was used as a sorbent in a vortex-assisted solid-phase extraction and combined with high performance liquid phase tandem mass spectrometry for the extraction and trace determination of six triazines in water samples (Atraton, Desmetryn, Prometon, Ametryn, Prometryn and Dimethametryn). Several parameters that affect the extraction efficiencies were investigated. Under the optimal conditions (MIL-101(Cr) loading, 150 mg; sample pH, 7; salt concentration, 0%; adsorption time, 3 min; desorption solvent, 1.5 mL acetonitrile; desorption time, 4 min), the proposed method was successfully used in the determination of trace triazines in five real water samples (drinking water, tap water, lake waters and river water), satisfactory recoveries were obtained in the range of 78.9%–118.6%. The limits of detection of the proposed method in detecting triazine herbicides in spiked water samples ranged from 0.014 to 0.045 ng mL −1 .
Yanxiao Jiang,Bo Zhang,Jingkang Li,Ying Sun,Xinghua Wang,Pinyi Ma,Daqian Song
A novel vortex-assisted solid-phase extraction method based on MIL-68(Al)/Chitosan-melamine sponge column (or V-MIL-68(Al)/CS-SC-SPE) is presented in this paper. The MIL-68(Al)/Chitosan-sponge column was prepared by a simple infiltration method and a preparation process that does not consume organic solvents. Scanning electron microscopy was used to characterize the functionalized sponge columns, and the skeleton and pores of the melamine sponge were successfully modified with the coating material (MIL-68(Al) and chitosan). Chitosan was used successfully not only as an adsorption adjuvant material, but also as an adhesive in the preparation of MIL-68(Al)/CS coating sponge materials. The presented method was further combined with high performance liquid chromatography (HPLC) and used in the determination of trace parabens (including methyl-, ethyl-, propyl- and butyl-parabens) in environmental water samples. Several important factors that affect the extraction performance were investigated. Under the optimum conditions, the method was successfully used to detect the four kinds of parabens in different water samples (domestic water, lake water and river water). The limits of detection ranged between 0.21 and 0.50 ng/mL, and the relative standard deviations for all parabens were below 10.8%.
危险品化学品经营许可证（带存储）