Preparation and Recognition Properties of Molecularly Imprinted Nanofiber Membrane of Chrysin

Abstract

The separation and extraction of chrysin from active ingredients of natural products are of great significance, but the existing separation and extraction methods have certain drawbacks. Here, chrysin molecularly imprinted nanofiber membranes (MINMs) were prepared by means of electrospinning using chrysin as a template and polyvinyl alcohol and natural renewable resource rosin ester as membrane materials, which were used for the separation of active components in the natural product. The MINM was examined using Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The adsorption performance, adsorption kinetics, adsorption selectivity, and reusability of the MINM were investigated in static adsorption experiments. The analysis results show that the MINM was successfully prepared with good morphology and thermal stability. The MINM has a good adsorption capacity for chrysin, showing fast adsorption kinetics, and the maximum adsorption capacity was 127.5 mg·g−1, conforming to the Langmuir isotherm model and pseudo-second-order kinetic model. In addition, the MINM exhibited good selectivity and excellent reusability. Therefore, the MINM proposed in this paper is a promising material for the adsorption and separation of chrysin.

Bio-Based Polyurethane Foams for the Removal of Petroleum-Derived Pollutants: Sorption in Batch and in Continuous-Flow

“…The sorbed gasoline was 49 g/g and diesel 62 g/g for PU1 while the sorbed gasoline was 52 g/g and diesel 65 g/g for PU2. The affinity of PU1 and PU2 is slightly higher for diesel than gasoline; this is probably due to the higher density of diesel with respect to gasoline, which allows a better retention in the pores of the polymers [ 45 , 46 ].…”

“…We used pseudo-first order, pseudo-second order and intraparticle diffusion models to rationalize the sorption mechanism. The first model describes processes with the following characteristics: linear equilibrium of sorption, dependency by time but not by solute concentration, systems which quickly reach equilibrium and so on [ 46 , 47 ]. These situations often occur in the initial stages of the sorption process.…”

“…This can probably be rationalized by the fact that the insertion of cellulose citrate inside the polymer raises the hydrophobicity and therefore the affinity itself towards these petroleum-hydrocarbon pollutants. In addition, the experimental q e is higher for diesel than gasoline for both materials probably due to diesel viscosity, which allows it to be more retained in the pores of the polyurethanes [ 46 ].…”

“…For a deeper understanding, we investigated which was the best isotherm model to represent the obtained experimental data among Langmuir, Freundlich and Redlich–Peterson models in gasoline/water and diesel/water system. Langmuir isotherm is a model relating to a type of process which consists of a monolayer adsorption on a homogeneous surface in which the functional groups are also distributed equally and no chemical reaction occurs between the adsorbent and the adsorbate [ 46 ]. The equation relative to the first model is the following: in which q max is the maximum sorption capacity (g/g), q e is the quantity of oil sorbed at the equilibrium (g/g), C e is the oil concentration at the equilibrium (g/L) and K L is the Langmuir isotherm constant (L/g).…”

Alkane molecularly imprinted nanofiber membranes used to enhance the diesel degradation process

“…These MINMs were then utilized to separate the active ingredients in the natural product, the results showed that MINM has good adsorption capacity for chrysin. 10 When MIP is added to the spinning solution for electrospinning, the MINMs obtained not only has large specific surface area, high porosity, but also has the advantages of good flexibility, mechanical strength and reuse, and so on. 11 Compared with MIP, it also has the advantages of easy separation from the sample to be measured, higher mass transfer rate and binding capacity.…”