Preparation of Carboxyl-Functionalized Cross-linked Copolymer Microspheres and Their Adsorption Performances for Methylene Blue
Taking divinylbenzene(DVB)as the crosslinking agent,α-methylstyrene(AMS)and maleic anhydride(MAH)as monomers,cross-linked copolymer microspheres of α-methyl styrene and maleic anhydride(PAMSMs)were designed and synthesized via in-situ self-stabilized precipitation polymerization.After reacting with sodium hydroxide,PAMSMs were transformed to carboxyl-functionlalized cross-linked copolymer microspheres(PAMSMs-COOH).The structures of the microspheres were characterized,the adsorption performance and adsorbent recycling experiment of PAMSMs-COOH for MB were investigated.The scanning electron microscope(SEM)analysis results show that the gloss microspheres with spherical morphology and narrow size distribution were obtained.The maximum adsorption capacity of PAMSMs-COOH for MB is up to 261 mg/g when the initial concentration of MB is 200 mg/L,the dosage of adsorbent is 0.50 g/L,the pH of solution is 7,the adsorption temperature is 313 K,and the reaction time is 4 h.The kinetics and isothermal data for the MB adsorption of microspheres respectively fit the pseudo-second-order model and Langmuir isothermal model.The adsorption of MB by PAMSMs-COOH is a spontaneous endothermic process.In addition,the removal rate of MB by PAMSMs-COOH remains more than85.0%after five adsorption-desorption cycle experiments.
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