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AP树脂是将a—胺基吡啶接到交联聚苯乙烯载体上而获得的带有官能团的树脂。这种树脂对金的吸着容量竞高达500—600mg/g干树脂,如此高的金的吸着容量,在文献上尚属少见。AP树脂在酸性条件下不仅能吸着金,而且对其它贵金属也具有一定的吸着能力,但对绝大多数贱金属却不吸着。通过静态吸着实验表明:树脂能迅速将金吸着,即金在两相间的传质较快。通过柱色谱试验表明:用1N盐酸作淋洗液可将贱金属离子洗脱下来,而贵金属保留在柱上,再用HCl-NaClO_4为淋洗液则其它贵金属离子可被洗脱,最后只有金保留在柱子上,只有用90％丙酮-5％浓HCl-5％水作淋洗液才能洗脱金。因此AP树脂对贵金属和金均有极高的选择性。AP树脂合成路线简单、价格低廉、性能稳定可长久反复使用,本文AP用树脂分离富集湖水及模拟海水中的痕量金,结果比较满意。
The AP resin is a resin having a functional group obtained by attaching a-aminopyridine to a crosslinked polystyrene support. This resin gold sorption capacity of up to 500-600mg / g dry resin, such a high gold adsorption capacity, is still rare in the literature. AP resin not only absorbs gold under acidic conditions, but also has some sorption capacity to other precious metals, but not to most base metals. Static adsorption experiments show that: the resin can quickly gold adsorption, that is, gold in the two phase mass transfer faster. The results of column chromatography showed that base metal ions could be eluted by using 1N hydrochloric acid as eluent and noble metal remained on the column, while other precious metal ions could be eluted by using HCl-NaClO_4 as eluant. Finally, only gold Remaining on the column, gold is eluted only with 90% acetone - 5% concentrated HCl - 5% water as eluent. Therefore, AP resins are highly selective for both precious metals and gold. AP resin synthesis route is simple, low cost, stable performance and long-term repeated use of AP separation and enrichment of resin in lake water and trace gold in seawater, the results are satisfactory.