Current efficiency studies of the zinc electrowinning process on aluminum rotating cylinder electrode (RCE) in sulfuric acid medium: Influence of different additives
Current efficiency studies of the zinc electrowinning process on aluminum rotating cylinder electrode (RCE) in sulfuric acid medium: Influence of different additives
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DOI：
10.1016/j.electacta.2007.04.112
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发表时间：
2007-08
影响因子：
6.6
通讯作者：
A. Recéndiz;I. González;J. Nava
中科院分区：
文献类型：
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作者：
A. Recéndiz;I. González;J. Nava
研究了在85 gL − 1 Zn（II）（1.3M）和108 gL − 1H 2SO 4（1.1M）的溶液中，十二烷基硫酸钠（SLS）、十六烷基三甲基溴化铵（CTABr）和阿拉伯胶（AG）三种添加剂对铝上锌电积的影响。这三种添加剂的影响进行了分析，在还原过程的不同阶段，使用计时电位技术上的铝旋转盘电极（RDE）。确定了在三种不同添加剂存在下发生锌电沉积的电位范围（−1.05<E<−0.85V vs SHE）和电流密度（−51<i<−0.2mAcm−2）。使用这些参数来确定电流效率（Φ），通过在铝旋转圆柱电极（RCE）上进行电解来评估;在SLS、CTABr和AG存在下，锌沉积效率分别为95%、96%和99%，均高于无任何添加剂（WA）时获得的效率（Φ）= 84%。在电解结束时沉积物的均匀性意味着（RCE）促进电极表面上的均匀电流密度，因此，可以被认为是评估电流效率的模型电池。
This work studies the effect of three additives, sodium lauryl sulfate (SLS), cetyltrimethylammonium bromide (CTABr) and arabic gum (AG) on zinc electrowinning on aluminum in a solution of 85gL−1Zn(II) (1.3M) in 108gL−1H2SO4(1.1M). The influence of these three additives is analyzed during the different stages of the reduction process using chronopotentiometric techniques on an aluminum rotating disk electrode (RDE). Potential ranges (−1.05<E<−0.85V versus SHE) and current density (−51<i<−0.2mAcm−2) within which zinc electrodeposition takes place in the presence of the three different additives were established. These parameters were used to determine current efficiencies (Φ), evaluated by electrolysis on an aluminum rotating cylinder electrode (RCE); the zinc deposition efficiency in the presence of SLS, CTABr and AG, was 95%, 96% and 99%, respectively, were all greater than the efficiency obtained without any additive (WA), Φ=84%. The homogeneity of the deposits at the end of electrolyses implied that the (RCE) promotes uniform current density on the electrode surface and, hence, can be considered a model cell to evaluate current efficiencies.