Enhanced electro-generated ferrate using Fe(0)-plated carbon sheet as an anode and its online utilization for removal of cyanide.
Enhanced electro-generated ferrate using Fe(0)-plated carbon sheet as an anode and its online utilization for removal of cyanide.
复制标题
DOI：
10.1016/j.chemosphere.2019.125124
复制
发表时间：
2020-02
期刊：
影响因子：
8.8
通讯作者：
Feihu Zeng;Cong Chen;Xianfeng Huang
中科院分区：
文献类型：
--
作者：
Feihu Zeng;Cong Chen;Xianfeng Huang
高铁酸盐（Fe（VI））的有效电化学生成仍然受到铁材料钝化的挑战。在此，我们采用镀有Fe（0）的碳片作为阳极，以使得能够有效地生产Fe（VI），其浓度高达55mM，这是使用相同尺寸的铁片作为阳极的浓度的8倍。扫描电镜结果表明，锥形Fe（0）颗粒在碳片表面紧密均匀地分散，有助于防止钝化层的形成。电沉积Fe（0）的制备过程影响Fe（VI）的生成。电镀时间增加到40 min，电镀温度增加到30 °C，有利于Fe（VI）的生成，而电镀液中Fe2+浓度的变化对Fe（VI）的生成影响不大。然而，添加剂的加入抑制Fe（VI）的生成。此外，实现了有效的去除氰化物使用在线生产的Fe（VI），可比的NaClO和高于其他传统的氧化剂含有H2O2，O3，和KMnO4。该研究为电化学法高效制备Fe（VI）提供了一种简单可行的铁阳极。
Efficient electrochemical generation of ferrate (Fe(VI)) is still challenged by the passivation of iron materials. Herein, we employed Fe(0)-plated carbon sheet as an anode to enable an efficient production of Fe(VI) with its concentration reached up to 55 mM, which was 8 times higher than that with iron sheet of the same size as an anode. The SEM results showed that the close and uniform dispersion of tapered Fe(0) particles on the surface of carbon sheet helped prevent the formation of passivated layer. The preparative process of electro-deposited Fe(0) affected the generation of Fe(VI). The increase of electroplating time to 40 min and electroplating temperature to 30 °C promoted the production of Fe(VI), and the change in the concentration of Fe2+in electroplated solution showed little impact on Fe(VI) generation. However, the addition of additives inhibited Fe(VI) generation. As well, an effective removal of cyanide was achieved using on-line production of Fe(VI), comparable to that by NaClO and higher than that by other traditional oxidants containing H2O2, O3, and KMnO4. This study would provide an simple and promising iron anode for efficient production of Fe(VI) by electrochemical method.