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以PdCl_2为钯前驱体、银杏叶提取液为还原剂,采用植物还原法将Pd~(2+)从PdCl_2溶液中还原出来,制备钯纳米单质;采用等离子体发射光谱分析法(ICP-AES)测定反应溶液中残留的Pd~(2+)浓度,计算反应的还原率;采用正交实验探讨PdCl_2浓度、反应温度、反应时间及银杏叶提取液体积对还原率的影响。结果表明,钯纳米单质最佳制备条件为:PdCl_2浓度0.005 mol·L~(-1)、反应温度80℃、反应时间24 h、银杏叶提取液体积60 mL,在此条件下,反应的平均还原率为91.74%。证实,可以用ICP-AES对植物还原法进行定量研究。
Palladium-Nano-element was prepared by Pd_ (2+) reduction from PdCl_2 solution using PdCl_2 as the precursor and Ginkgo biloba extract as the reductant. Phosphoric acid was extracted by ICP- The concentration of Pd 2+ in the reaction solution was determined and the reduction rate was calculated. The effects of PdCl 2 concentration, reaction temperature, reaction time and the volume of Ginkgo biloba extract on the reduction rate were investigated by orthogonal experiments. The results showed that the optimal conditions for the preparation of Pd nano-particles were as follows: the concentration of PdCl 2 was 0.005 mol·L -1, the reaction temperature was 80 ℃, the reaction time was 24 h and the volume of Ginkgo biloba extract was 60 mL. Under this condition, The reduction rate was 91.74%. Confirmed that the plant reduction method can be quantitatively studied by ICP-AES.