Functional adsorbent as endocrine disruptor using pH-responsive polymer grafted on porous ethylene vinyl acetate disk
Functional adsorbent as endocrine disruptor using pH-responsive polymer grafted on porous ethylene vinyl acetate disk
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DOI：
10.1016/j.cej.2014.02.048
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发表时间：
2014-06
影响因子：
15.1
通讯作者：
K. Teramoto;Sho Kimata;Toshiyuki Harada;Shuji Sakohara
中科院分区：
文献类型：
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作者：
K. Teramoto;Sho Kimata;Toshiyuki Harada;Shuji Sakohara
采用等离子体引发聚合的方法，将3种不同摩尔比的2-（丙烯酰胺）-2-甲基丙磺酸钠（NaAMPS）和12-甲基丙烯酰胺十二癸酸钠（NaMmD）随机共聚物接枝到多孔乙烯醋酸乙烯（PEVA）圆盘的孔表面。将不同pH值的双酚a （BPA）溶液渗透到聚合物接枝的PEVA圆盘上，考察了双酚a的吸附和解吸性能。通过聚合物接枝PEVA圆盘的渗透率取决于接枝聚合物分子的构象，而构象又取决于渗透溶液的pH。pH值在9 ~ 10之间出现峰值。双酚a的吸附量也显著依赖于渗透双酚a溶液的pH值，在pH值为6和10左右时观察到两个峰值。大约10的pH值与形成单分子胶束所需的pH值几乎相同。双酚a的吸附量是由于双酚a被包封在胶束的疏水微域内，并通过疏水相互作用吸附在胶束外悬垂的疏水MmD基团上。pH值为10时BPA的包封量明显大于pH值为6时。此外，双酚a的总吸附量很大程度上取决于共聚物的组成，即NaAMPS和NaMmD的摩尔比；随着疏水组分NaMmD用量的增加，其含量也随之增加。然而，当NaAMPS和NaMmD的摩尔比相等时，接枝聚合物在疏水微域内的包封量明显增加。
Random copolymers of sodium 2-(acrylamido)-2-methylpropanesulfonate (NaAMPS) and sodium 12-methacrylamidododecanoate (NaMmD) with three different molar ratios were grafted onto the pore surface of a porous ethylene vinyl acetate (PEVA) disk by a plasma-initiated polymerization method. Bisphenol-A (BPA) solutions with various pH values were permeated through the polymergrafted PEVA disk, and the adsorption and desorption properties of BPA were examined. The permeability through the polymer-grafted PEVA disk depended on the conformation of the polymer molecules grafted on the disk, which in turn depended on the pH of the permeated solution. A peak was observed at the pH value between 9 and 10. The adsorption amount of BPA also significantly depended on the pH of the permeated BPA solution and two peaks were observed, at pH values of around 6 and 10, respectively. The pH around 10 was the almost the same pH as that required for the formation of the unimolecular micelles. The adsorption amount of BPA resulted from the encapsulation of BPA within the hydrophobic microdomains in the micelles and its adsorption on the pendant hydrophobic MmD groups outside of the micelles by hydrophobic interactions. The encapsulated amount of BPA at pH 10 was significantly large compared with that at pH 6. Furthermore, the total adsorption amount of BPA largely depended on the composition of the copolymer, i.e., the molar ratio of NaAMPS and NaMmD; the amount increased with increase in the amount of the hydrophobic component NaMmD. However, the encapsulated amount of BPA within the hydrophobic microdomains was markedly larger when the grafted polymer was prepared with an equivalent molar ratio of NaAMPS and NaMmD.