Adsorption characteristics of monodisperse magnetic cation‐exchange microspheres prepared based on swell‐penetration method

Abstract

A simple swell‐penetration method for the controlled preparation of magnetic polymer microspheres (MPMs) was developed. The polymer microspheres (PMs) were prepared using glycidyl methacrylate as monomer and trimethylolpropane trimethacrylate as crosslinker. The PMs was functionalized by coupling sulfonate groups, and then formation of the MPMs in the presence of ferrous sulfate by swell‐penetration method. The morphology, size, and magnetic properties of the MPMs were characterized by SEM, using a vibrating sample magnetometer, and by FTIR. The results showed that the average particle size was about 1.1 μm, the surface of the microspheres was smooth, and saturated magnetization was 13.8 emu g−1. The adsorption isotherms and kinetics between bovine serum albumin and the MPMs under the optimized adsorption conditions were investigated. The MPMs were further applied to the selective separation of serum albumin from human whole blood. Simultaneously, the adsorption and separation of melamine from milk using the MPMs was investigated. The MPMs showed promising potential for separation of protein and cationic small molecular compound. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 48019.

Multiwavelength Phototactic Micromotor with Controllable Swarming Motion for “Chemistry-on-the-Fly”

“…The composite microparticles were prepared by a penetration-deposition method. 32 First, 1 g of the obtained particles (i.e., PS, PG, or PGS) was sulfonated with concentrated sulfuric acid (98%, 10 mL) at 40 °C for 4 h. Then, 1 g of the sulfonated particles (i.e., SPS, SPG, or SPGS) and 0.8 g of FeSO 4 •7H 2 O were well dispersed in 50 mL of distilled water. The solution was purged with nitrogen for 30 min and then stirred at 25 °C for 12 h. Subsequently, 50 mg of NaNO 2 and 12 mL of 25% (w/w) ammonia were successively added into the flask and the mixture was kept shaking at 40 °C for another 2 h.…”

“…The composite microparticles were prepared by a penetration-deposition method . First, 1 g of the obtained particles ( i.e ., PS, PG, or PGS) was sulfonated with concentrated sulfuric acid (98%, 10 mL) at 40 °C for 4 h. Then, 1 g of the sulfonated particles ( i.e ., SPS, SPG, or SPGS) and 0.8 g of FeSO 4 ·7H 2 O were well dispersed in 50 mL of distilled water.…”

Strategies Towards Submicron Size and High-Performance Magnetic PGMA@Fe3O4@SiO2–COOH Microspheres with Biological Application

“…This method was widely used and has developed into products like Dynabeads ® [22]. However, up to now, most of the studies of in situ coprecipitation magnetic polymer microspheres were based on micron-sized polymer spheres [23][24][25][26], and there are few studies focused on submicron and monodispersed polymer spheres, also the bonding mechanism of Fe 3 O 4 nanoparticles and polymer microspheres has not been well explained. Therefore, it is imperative to conduct thorough investigations on materials with elevated Fe 3 O 4 concentrations and submicron-sized magnetic polymer microspheres.…”

“…d) indicates that after SiO 2 coating and carboxyl functionalized, the Si-O and Si-O-Si vibration peaks can be observed in turn at 465 and 1078 cm − 1 , and the carboxyl characteristic peak at 1399 cm − 1 is strengthened while stretching vibration peak of C = O bond at 1730 cm − 1 is weakened. However, epoxy groups have obvious vibration peaks at 845 and 910 cm − 1[25] (Fig.S1), proving the ring-open reaction between epoxy and amino groups is complete.…”

Strategies towards submicron size and high performance magnetic PGMA@Fe3O4@SiO2-COOH microspheres with biological application

“…This method was widely used and has developed into products like Dynabeads ® [22]. However, up to now, most of the studies of in situ coprecipitation magnetic polymer microspheres were based on micron-sized polymer spheres [23][24][25][26], and there are few studies focused on submicron and monodispersed polymer spheres, also the bonding mechanism of Fe 3 O 4 nanoparticles and polymer microspheres has not been well explained. Therefore, it is imperative to conduct thorough investigations on materials with elevated Fe 3 O 4 concentrations and submicron-sized magnetic polymer microspheres.…”