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本文研究了含偕胺肟基维尼纶无纺布对Au~(3+)的还原反应动力学,证明该材料对Au~(3+)还原反应速度较快,室温下反应约400分钟,对Au~(3+)的还原容量约为1200mg/g。反应温度上升或Au~(3+)起始浓度增加,还原反应速度加快,还原容量增大;溶液酸度增大,反应速度下降,还原容量减小。所用材料尺寸减小或搅拌速度提高,有利于提高反应速度和还原容量。对部分反应动力学曲线进行数学处理,结果表明,当体系中Au~(3+)的含量较低时,Au~(3+)的变化规律符合lnC_(Au~(3+))=lnC_(Au~(3+))-Kt方程。当体系中Au~(3+)含量较高时,反应起始阶段也符合此方程,但当反应程度大到一定值后则逐渐偏离该方程。
In this paper, the kinetics of reductive reaction of Au ~ (3 +) with amidoxime-containing vinylon non-woven fabric was studied. It was found that the reduction reaction of Au ~ (3+) was rapid at room temperature for about 400 minutes. Au ~ (3 +) reduction capacity of about 1200mg / g. The reaction temperature increases or the initial concentration of Au ~ (3 +) increases, the reduction reaction speed increases and the reduction capacity increases. The solution acidity increases, the reaction rate decreases, and the reduction capacity decreases. Materials used to reduce the size or speed of stirring, help to improve the reaction rate and reduction capacity. The results show that when the content of Au ~ (3 +) in the system is low, the change law of Au ~ (3 +) is in accordance with lnC_ (Au ~ (3 +)) = lnC_ Au ~ (3 +)) - Kt equation. When the content of Au ~ (3 +) in the system is high, the initial stage of the reaction also accords with this equation, but when the reaction reaches a certain value, it gradually deviates from the equation.