HAuCl_4在笼形聚偕胺肟树脂上的吸附及结晶过程

HAuCl_4 adsorbed and reduced by "cage" polyamidoxime adsorbents and the crystal of gold grows in situ

制备了一系列以无机酸、有机酸和酚类化合物处理的宪形聚偕胺后树脂（HX/ACAO、RCO2H/ACAO、Ph/ACAO），测定了它们对HAuCl4的吸附容量，发现吸附能力与质子酸的pka值有关，酸阴离子的结构也有一定的影响，pka值越高，酸阴离子的空间位阻越小，吸附HAuCl4的能力越强。从扫描电镜观察到HAuCl4被还原为单质金后，在ACAO表面上形成晶核，并迅速增长成晶粒、晶须和晶块。

A series of acidic cage polyamidoxime adsorbents (ACAO) was prepared by basic cagepolyamidoxime (BCAO) treated with inorganic acids, carboxylic acids, and a group ofpheno1s (HX/ACAO, RCO2H/ACAO and Ph/ACAO). The adsorption capacity of theseadsorbents was determined. It was found that the adsorptivity is related to the pka valuesand the space structure of the acids. By SEM, we observed that the HAuCl4 adsorbed isreduced to Au (0) and the cryStal nucleus form in situ, which grows quickly to be the crystalin different patterns.