Sol-gel synthesis, characterization, and catalytic properties of Ni, Cd, Co, and Fe oxides recycled from spent Ni-Cd batteries using citric acid as a leaching agent
Sol-gel synthesis, characterization, and catalytic properties of Ni, Cd, Co, and Fe oxides recycled from spent Ni-Cd batteries using citric acid as a leaching agent
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DOI：
10.1016/j.matchemphys.2017.11.025
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发表时间：
2018-02
影响因子：
4.6
通讯作者：
J. Ribeiro;T. Moreira;I. L. Santana;Sandra Ferreira;M. Lelis;M. Freitas
中科院分区：
文献类型：
--
作者：
J. Ribeiro;T. Moreira;I. L. Santana;Sandra Ferreira;M. Lelis;M. Freitas
本研究以柠檬酸为浸出剂，开发了一种可持续的、绿色的、湿法冶金方法来回收镍镉电池正极。采用凝胶前驱体，在400℃下煅烧2 h，合成了混合氧化物。混合氧化物由氧化镍（NiO）、氧化镉（CdO）、氧化钴（Co3O4）和氧化铁（Fe2O3）组成。扫描电镜（SEM）显示，混合氧化物的形态结构不明确，但存在约20 μm大小的大孔和1.0 μm大小的微孔。透射电子显微镜（TEM）图像显示，团聚体由纳米级六边形结构组成。将该材料应用于光催化反应中对纺织活性黑色V-2B染料（C26H21O19N5S6Na4）进行脱色。在480 min内脱色率达86.10%，反应动力学为二级反应。
This research developed a sustainable, green, hydrometallurgical route for recycling the positive electrodes of Ni-Cd batteries using citric acid as a leaching agent. The mixed oxide was synthesized using a gel precursor that was calcinated at 400 °C for 2 h. The mixed composition of the metal oxide included nickel oxide (NiO), cadmium oxide (CdO), cobalt oxide (Co3O4), and iron oxide (Fe2O3). A scanning electron microscopy (SEM) micrograph showed that the mixed oxide presented no well-defined morphological structure but did present macropores that were about 20 μm in size and micropores that were 1.0 μm in size. Transmission electron microscopy (TEM) images showed that the agglomerate was composed of hexagonal structures that were nanometric in size. The material was applied in a photocatalytic reaction to discolor a textile-reactive black V-2B dye (C26H21O19N5S6Na4). The efficiency of the discoloration reached 86.10% in 480 min, and the catalyzed reaction showed second-order kinetics.