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首页> 外文期刊>Separation and Purification Technology >Electrochemical recovery of tin and palladium from the activating solutions of the electroless plating of polymers Potentiostatic operation
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Electrochemical recovery of tin and palladium from the activating solutions of the electroless plating of polymers Potentiostatic operation

机译：从聚合物化学镀的活化溶液中电化学回收锡和钯恒电位运行

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摘要

An electrochemical reactor having a ceramic diaphragm was applied to recover tin and palladium from the activating solutions of the electroless plating of polymers.The different figures of merit (fractional conversion,current efficiency,space-time yield and specific energy consumption)for the electrochemical reactor were analysed.In the absence of palladium,as the electrode potential was shifted towards more negative values,the space-time yield of tin (eta)and tin fractional conversion (X)were increased because of the increase in the electrode roughness and the hydrogen turbulence-promoting action.Simultaneously,current efficiency for the tin deposition (phi)was decreased,and subsequently the specific energy consumption (E_s)was increased due to the hydrogen cathodic reaction.When experimental conditions are very cathodic,i.e.around - 1 V with respect to a standard Ag/AgCl saturated KC1 reference electrode,Sn(IV)electrochemical reduction takes place with the formation of Sn(II).The Pd(II)effect on Sn(IV)electrochemical deposition and the related figures of merit were also evaluated.At -0.4 V,the recovery of both metals separately was possible.The presence of Pd(II)enhanced Sn(IV)deposition for more positive potential values than -0.6 V.At -0.6 V,low values of total energy consumed in addition to the maximum global current efficiency (>70%)were obtained.On the other hand,quite good values of fractional conversion were obtained for both tin (100%)and palladium (>90%).
机译：将具有陶瓷隔膜的电化学反应器应用于从聚合物化学镀的活化溶液中回收锡和钯。电化学反应器的不同优值（分数转化率，电流效率，时空产率和比能耗）在不存在钯的情况下，随着电极电势向更多的负值移动，由于电极粗糙度和氢的增加，锡（eta）和锡分数转化率（X）的时空产率增加。同时，由于氢的阴极反应，锡沉积的电流效率（phi）下降，随后比能量消耗（E_s）增加。当实验条件为非常阴极时，即-1 V时相对于标准的Ag / AgCl饱和KCl参比电极，Sn（IV）的电化学还原反应会形成Sn（II）。 II）对Sn（IV）电化学沉积的影响以及相关的性能指标也进行了评估。在-0.4 V时，两种金属可以分别回收.Pd（II）的存在增强了Sn（IV）的沉积，从而更有利于电位值超过-0.6 V.在-0.6 V时，除了最大全局电流效率（> 70％）之外，还获得了较低的总能量消耗值。另一方面，两种锡都获得了相当好的分数转换值（100％）和钯（> 90％）。

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