杯芳烃接枝超细SiO2的制备及其对Cu^2＋、Ag^＋萃取性能的研究

Preparation of Calixarene Grafting Ultrafine Silica and Study on Their Extraction Ability for Cu^(2+) and Ag^+

通过对杯[4]芳烃以及杯[6]芳烃上缘进行烯丙基化和硅氢加成2步衍生化反应得到硅氢化杯[4]芳烃以及硅氢化杯[6]芳烃,再将这2种硅氢化杯芳烃衍生物分别接枝到超细SiO2上。在不同的pH值条件下,就2种杯芳烃接枝超细SiO2衍生物对水合Cu2+及Ag+的萃取性能进行了研究。结果表明,与对叔丁基杯芳烃相比较,杯芳烃接枝超细SiO2衍生物对Cu2+和Ag+的萃取率都有所提高,其中杯[4]芳烃接枝超细SiO2对Ag+的最高萃取率达到98.78%,杯[6]芳烃接枝超细SiO2对Cu2+的最高萃取率达到67.74%。

Hydrosilylated calix[4]arene and hydrosilylated calix[6]arene were prepared through a two-step derivatization reaction including allylation and hydrosilylation at the upper rim of calix[4]arene and calix[6]arene.These two kinds of hydrosilylated calixarene derivative were successfully grafted onto the ultrafine silica surface.The ability of the two kinds of calixarene derivatives grafted on ultrafine silica to extract hydrated Cu^2＋ and Ag^＋ was studied under different pH conditions.The results show that the extraction ability of the two kinds of calixarene grafted on ultrafine silica for Cu^2＋ and Ag^＋ was higher than that of p-tert-butylcalixarene.Maximum extraction percentage of the calix[4]arene grafted on ultrafine silica for silver ion was up to 98.78%,and that of the calix[6]arene grafted on ultrafine silica for cupric ion was 67.74%.