The Preparation and Exclusion Proteins Performance Study of PVBC/DVB Carbon Sphere Adsorbent Grafted with Internal Copolymer Adsorption Layer and External Zwitterionic Polymer
In order to address the issue of dye contamination,a new adsorbent with anti-protein interference was developed for dye removal.Poly(4-vinylbenzylchloro-co-divinylbenzene)(PVBC/DVB)microspheres were synthe-sized and carbonized to obtain PVBC/DVB carbon spheres as the substrate.Through a two-step atom transfer radical polymerization(ATRP)method,PVBC/DVB carbon spheres were firstly grafted with a mixture of 4-vinylbenzene sulfonate(Nass)and styrene(St),creating adsorption sites with hydrophobic effect and ion exchange force to improve dye adsorption capacity.Then a second ATRP reaction was conducted to graft zwitterionic 2-methylac-ryloxyethylphosphocholine(MPC)monomers onto the external surfaceof PVBC/DVB carbon spheres,forming highly hydrophilic zweitterionic polymers as exclusion sites to improve the anti-interference ability against bio-logical macromolecules such as proteins.The results showed that the adsorbent PVBC/DVB@poly(St-co-Nass)@poly(MPC)had high adsorption capacity and fast adsorption rate for six common dyes found in wastewater,while achieving a remarkable 96.6%interference rejection capacity against bovine serum albumin.The adsor-bent had excellent anti-interference properties and can be applied for the removal of organic dyes in wastewater.After 7 cycles of adsorption experiments,the adsorbent still showed superior adsorption performance.
dyeadsorptionanti-interferenceatom transfer radical polymerization
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