Preparation of high-capacity strong cation exchange membrane for protein adsorption via surface-initiated atom transfer radical polymerization

Preparation of 4-vinylpyridine (4VP) resin and its adsorption performance for heavy metal ions

“…10 Our group has proven that SI-ATRP is one the new methods for the preparation of high volume adsorbing materials for anion and cation-exchange membranes. 11,12 From the perspective of monomer structures, vinyl pyridine contains -N], which has one unused electron pair that is not involved in the conjugated system on the ring; therefore, the vinyl pyridine modied resin has advantages and specic functions as compared to those of the styrene resin. [13][14][15] The carbon atoms and nitrogen atoms on the pyridine ring are bonded via sp 2 hybrid orbitals.…”

Protein adsorption and desorption behavior of a pH-responsive membrane based on ethylene vinyl alcohol copolymer

“…A predominantly convective transport mechanism of the solutes through the membrane pores to the adsorption sites is superior to the intraparticle diffusion transport mechanism of resinbased chromatography. Until now, various types of membranes have been investigated for protein purication, 1,2 i.e., membrane chromatography based on ion exchange, [3][4][5][6] affinity, [7][8][9] and hydrophobic interactions. 10,11 Stimuli-responsive membrane can change structural and functional properties (i.e.…”

Sulfonated halloysite nanotubes/polyethersulfone nanocomposite membrane for efficient dye purification

“…As we know, the charge density of membrane surface plays a key role in the separation performance of the membranes [35], however, HNTs own a low charge density, which could not affect the membrane potential when they are embedded into the polymer matrix. The sulfonic acid group, owing a higher charge density, has been widely used in the application of separation process [36]. Given the fact that soluble sulfonic acid group is easily leached out during the phase inversion process, it is desirable to introduce the sulfonic acid group onto the HNTs surface, thus notably improving the hydrophilicity and charge density of HNTs surface.…”