Preparation of Rosin-Based Composite Membranes and Study of Their Dencichine Adsorption Properties

Abstract

In this work, rosin-based composite membranes (RCMs) were developed as selective sorbents for the preparation of dencichine for the first time. The rosin-based polymer microspheres (RPMs) were synthesized using 4-ethylpyridine as a functional monomer and ethylene glycol maleic rosinate acrylate as a crosslinking. RCMs were prepared by spinning the RPMs onto the membranes by electrostatic spinning technology. The optimization of various parameters that affect RCMs was carried out, such as the ratio concentration and voltage intensity of electrospinning membrane. The RCMs were characterized by SEM, TGA and FT-IR. The performances of RCMs were assessed, which included adsorption isotherms, selective recognition and adsorption kinetics. The adsorption of dencichine on RCMs followed pseudo-second-order and adapted Langmuir–Freundlich isotherm model. As for the RCMs, the fast adsorption stage appeared within the first 45 min, and the experimental maximum adsorption capacity was 1.056 mg/g, which is much higher than the previous dencichine adsorbents reported in the literature. The initial decomposition temperature of RCMs is 297 °C, the tensile strength is 2.15 MPa and the elongation at break is 215.1%. The RCMs have good thermal stability and mechanical properties. These results indicated that RCMs are a tremendously promising adsorbent for enriching and purifying dencichine from the notoginseng extracts.

Study of the Preparation and Properties of Chrysin Binary Functional Monomer Molecularly Imprinted Polymers

“…The pore volume and surface area of the Bi-MIPs are 4.459 × 10 −3 cm³/g and 2.8488 ± 0.1059 m 2 /g, respectively. The Bi-MIPs and Bi-NIPs particles are the same, but the Bi-MIPs have more surface folds, which can provide more adsorption sites [ 19 , 42 ]. The results show that the chrysin occupies a position on the polymer surface during the synthesis process.…”

“…As shown in Figure 3 a, the Bi-MIPs, Bi-NIPs, Si-MIPs and Si-NIPs display a stretching vibration peak of -CH 2 - occurring at 2987 cm −1 , indicating that MAA is contained in polymerization. The stretching vibration peak of the -NH- double bond appeared at 1456 cm −1 , the single-bond vibration region of -CH appeared at 1398 cm −1 , and the stretching vibration peak of -C=O occurred at 1732 cm −1 [ 42 , 43 , 44 , 45 ]. The carbonyl groups tend to have a higher vibration absorption, indicating the successful preparation of the Bi-MIPs, Bi-NIPs, Si-MIPs and Si-NIPs.…”