偕胺肟基介孔二氧化硅对Cu^2＋的吸附性能

Study on Adsorption Properties of Amidoxime Functionalized SBA-15 for Cu^(2+)

以偕胺肟基介孔二氧化硅(AO-SBA-15)作为Cu^(2+)吸附剂,利用傅里叶红外光谱、X射线光电子能谱、ζ电位和低温N2吸附脱附等手段从酸度、络合作用、静电作用和吸附剂孔道结构方面研究了其对水中Cu^(2+)的吸附行为。结果表明,当p H在4~7内时偕胺肟基SBA-15对Cu^(2+)具有较好的吸附效果,吸附过程主要是由两者之间的共价络合作用将Cu^(2+)固定在吸附剂上,静电作用在吸附过程中也起到重要作用。随着溶液初始Cu^(2+)含量的增加,吸附容量也随之增大。

Amidoxime functionalized mesoporous silica （AO-SBA-15） was used as the copper ion adsorbent. The adsorption behavior of Cu^2＋ was studied in detail from acidity, cornplexation, electrostatic and pore structure by Fourier transform infrared spectroscopy （FTIR）, X-ray photoelectron spectroscopy （XPS）, Zeta potential analyzer and N2 adsorption-desorption. The results showed that, amidoxime functionalized SBA-15 had a good adsorption effect on Cu^2＋ when the pH were 447. Mainly through the covalent complexation, copper ions were fixed on the adsorbent, while electrostatic also played an important role in the adsorption process. The adsorption capacity was increased with the increase of the initial Cu^2＋ content.