Departamento de Engenharia Química e do Ambiente, Escola Superior de Tecnologia do Instituto Politécnico de Tomar, Estrada da Serra, 2300-313 Tomar, Portugal.
Chemosphere. 2012 Jan;86(4):341-7. doi: 10.1016/j.chemosphere.2011.09.040. Epub 2011 Oct 21.
Fe-Co(3)O(4) thin film with different amounts of Fe have been used for the electro-oxidation of phenol in alkaline medium at room temperature. The electrodes were prepared by coating stainless steel supports with successive layers of the oxides, obtained by thermal decomposition at 673 K. The electrolysis was carried out at constant potential and the phenol disappearance, during the electrolysis, was monitored by UV-Vis absorbance measurements between 250 and 500 nm. After 3 h of electrolysis, the intermediates were identified by comparing the HPLC data and UV-Vis spectra to those from pure standards. The results indicate that the same oxidation products are formed on the different prepared electrodes, namely the decomposition products of phenol such as benzoquinone, hydroquinone and cathecol in basic medium. Simulated results show clearly the decrease of the amount of phenolic species with the electrolysis time. An enhancement of the phenol removal is observed with the presence of iron in the oxide. Under the operating conditions, around 30% of the initial phenol has been removed at ca. 3 h and the complete degradation is obtained after 54 h of electrolysis, when Fe-Co(3)O(4) thin film with 10% of Fe is used as anode.
在室温碱性介质中，采用不同铁含量的 Fe-Co(3)O(4) 薄膜作为电催化剂，用于苯酚的电化学氧化。电极通过在 673 K 下热分解，在不锈钢基底上涂覆氧化物的连续层来制备。在恒电位下进行电解，通过在 250nm 至 500nm 之间的紫外可见吸收光谱监测苯酚在电解过程中的消失。电解 3 小时后，通过将 HPLC 数据和紫外可见光谱与纯标准品进行比较，确定了中间产物。结果表明，在不同制备的电极上形成了相同的氧化产物，即在碱性介质中苯酚的分解产物，如苯醌、对苯二酚和邻苯二酚。模拟结果清楚地表明，随着电解时间的延长，酚类物质的数量减少。在氧化物中存在铁时，观察到苯酚去除率的提高。在操作条件下，当使用 10%铁的 Fe-Co(3)O(4) 薄膜作为阳极时，约 3 小时后初始苯酚的去除率约为 30%，54 小时后可实现完全降解。
