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Preparation and characterization of porous cationic poly[styrene‐ co ‐( N , N ′‐dimethylaminoethyl methacrylate)] nanoparticles and their adsorption of heavy metal ions in water
Author(s) -
Hu Yang,
Wang Lihui,
Shen Jie,
Jiang Guoqiang,
Kan Chengyou
Publication year - 2018
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5541
Subject(s) - adsorption , methacrylate , emulsion polymerization , styrene , aqueous solution , alkali metal , materials science , metal ions in aqueous solution , sorption , cationic polymerization , specific surface area , polystyrene , nanoparticle , polymer chemistry , polymerization , inorganic chemistry , metal , chemistry , polymer , organic chemistry , copolymer , catalysis , nanotechnology , composite material , metallurgy
Using styrene (St) and N , N ′‐dimethylaminoethyl methacrylate (DMAEMA) as raw materials, monodispersed P(St‐ co ‐DMAEMA) nanoparticles (NPs) were first prepared via semi‐continuous emulsion polymerization, and using a stepwise acid–alkali post‐treatment, porous P(St‐ co ‐DMAEMA) NPs were then obtained and used to adsorb heavy metal ions in aqueous phase. Results showed that the post‐treatment conditions including temperature, initial pH and time of acid–alkali treatment had significant effects on the morphology of the porous P(St‐ co ‐DMAEMA) NPs, with higher temperature, more extreme pH condition and longer treatment time resulting in larger pores and volume swelling ratio. Under the optimized acid–alkali post‐treatment conditions (60 °C, acid treatment at pH = 4.0 for 1 h and then alkali treatment at pH = 10.0 for 1 h), the obtained porous NPs had nearly 15 times the surface area and 1.5 times the amount of surface amino groups than the corresponding solid NPs. An analysis of the mechanism of metal ion adsorption on the porous NPs indicated that the adsorbed amount of metal ions was the result of synergistic effect of physical and chemical adsorption, which was closely related to the porous NP surface area, amount of surface of amino groups and the volume of the ions. © 2018 Society of Chemical Industry