Despite the successes achieved in contaminant treatments with microscale Fe/Cu bimetals, some important limitations, such as high Cu loading and easily shedding of the Cu layer, cannot be ignored. The purpose of this research is to get a new mFe/Cu bimetal preparation method by changing the Cu(II) existence state during the preparation process. The Cu layer was regularly distributed on the surface of microscale Fe with uniform nanograde-sized globular shape particles (mFe/nCu) in the presence of complexants, which facilitated catalytic sites and galvanic couple formation. Furthermore, the reactivity of the prepared mFe/nCu bimetal increased linearly with the complexation constants (lgk_MY) of the different complexants. Particularly, k_obs (0.090 min^–1) obtained by mFe/nCu bimetallic particles after five cycles was higher than that of the fresh mFe/Cu (0.074 min^–1) bimetallic particles prepared without a complexant. This work improves the preparation of Fe/Cu bimetal and provides a deep insight into the improvement reason of reactivity and operational life.

中文翻译：

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Cu（II）的存在状态对微型Fe / Cu双金属的特性，反应性和可回收性的影响

尽管在微型Fe / Cu双金属污染物处理中取得了成功，但是一些重要的局限性，例如高的Cu负载和容易脱落的Cu层，也不能忽视。本研究的目的是通过在制备过程中改变Cu（II）的存在状态，从而获得一种新的mFe / Cu双金属制备方法。在络合剂存在下，Cu层规则地分布在具有均匀纳米级球形颗粒（mFe / nCu）的微米级Fe表面上，这有助于催化位点和电偶的形成。此外，所制备的mFe / nCu双金属的反应性随不同络合物的络合常数（lg k _MY）线性增加。特别是，k _obs（0.090分钟mFe / nCu双金属颗粒经过5个循环后获得的^–1）高于没有配位剂制备的新鲜mFe / Cu（0.074 min ^–1）双金属颗粒。这项工作改进了Fe / Cu双金属的制备，并为提高反应性和使用寿命提供了深刻的见解。