摘要
以丙烯酰胺(AM)和丙烯酸(AA)为单体、聚乙二醇(PEG4000)为造孔剂,通过聚合致分相过程在不同单体质量比下制备多孔p(AMcoAA)微球(PPMS),并用NaOH溶液对其改性,将其用于亚甲基蓝(MB)的吸附。采用红外光谱(FTIR)和扫描电子显微镜(SEM)对制备的PPMS进行分析,考察了单体中AA用量、吸附温度、pH和MB初始浓度等因素与吸附量的关系。结果表明,随着单体中AA质量分数的提高,微球的孔结构逐渐减少,AA质量分数为单体的50%时,观察不到微球的孔结构。当AA质量分数为单体的20%、pH为8、溶液温度为25℃时,制备的微球对MB的吸附性能最好,且高于不加AA时制得的多孔PAM微球的吸附量。吸附等温线符合Langmuir吸附等温模型,PPMS对MB的最大吸附量为2.565 g/g。PPMS吸附后在甲醇溶液中脱附再吸附、循环5次后,吸附量维持在最高值的96%以上。
Porous p(AM-co-AA)microspheres(PPMS)were prepared by polymerization-induced phase separation method at different monomer ratios by using acrylamide(AM)and acrylic acid(AA)as monomers,and polyethylene glycol(PEG-4000)as pore former.They were modified with sodium hydroxide solution and then were used for the adsorption of methylene blue(MB).The prepared PPMS were analyzed by infrared spectroscopy(FT-IR)and scanning electron microscope(SEM).The relationship between factors(AA content in the monomer,adsorption temperature,pH and initial concentration of MB)and adsorption capacity was examined.Results showed that the pore structure of the microspheres gradually decreased as the AA mass fraction in the monomer increased,and the pore structure of the microspheres was not observed when the AA mass fraction was 50%of the monomers.When the AA mass fraction was 20%of the monomer,the pH was 8,and the solution temperature was 25℃,the adsorption performance of the microspheres to MB was the best.In addition,the adsorption capacity was higher than that of the porous PAM microspheres prepared without AA.The adsorption isotherm accorded with the Langmuir adsorption isotherm model,and the maximum adsorption capacity of PPMS to MB was 2.565 g/g.The adsorbed microspheres could be desorbed in methanol solution.The adsorption capacity remained above 96%of the highest value after 5 cycles.
作者
刘建安
张利雄
LIU Jianan;ZHANG Lixiong(State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2021年第5期583-590,共8页
Journal of Nanjing Tech University(Natural Science Edition)
关键词
丙烯酰胺
丙烯酸
亚甲基蓝
吸附
水凝胶
acrylamide
acrylic acid
methylene blue
adsorption
hydrogels
