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本文主要研究了双组份离子共存体系的竞争还原容量、竞争反应动力学、影响竞争的各种因素以及竞争反应产物在活性碳纤维表面的形态。实验结果表明,在双组份离子体系中,活性碳纤维优先与电极电位高者反应,当两组份电极电位均较高时,两者先后都可与活性碳纤维反应,而两组份电极电位一高一低时,只有高电极电位离子能与活性碳纤维反应。当Au~(3+)与Fe~(3+)、Hg~(2+)等电极电位较低的离子共存时,活性碳纤维对Au~(3+)具有高度的选择还原特性。反应条件一般不改变离子参与反应的顺序。活性碳纤维制备工艺对产品的电极电位分布及选择反应特征没有本质上的影响。Hg~(2+)、Fe~(3+)的存在会影响Au在活性碳纤维表面的结晶形态。
In this paper, the competitive reduction capacity, competitive reaction kinetics, various factors affecting the competition and the morphology of competitive reaction products on the surface of activated carbon fiber were studied. The experimental results show that in the two-component ionic system, activated carbon fibers preferentially react with the electrode potential. When the electrode potentials of both components are high, both of them can react with the activated carbon fibers one after the other. High and low, only the high electrode potential ions can react with the activated carbon fiber. When Au ~ (3+) and Fe ~ (3 +) and Hg ~ (2+) ions coexist, the activated carbon fiber has a high degree of selective reduction of Au ~ (3+). The reaction conditions generally do not change the order in which ions participate in the reaction. Activated carbon fiber preparation process of the product electrode potential distribution and selective reaction characteristics have no essential effect. The presence of Hg ~ (2 +) and Fe ~ (3 +) will affect the crystal morphology of Au on the surface of activated carbon fiber.