晶面依赖Fe2O3电催化降解有机污染物性能研究
Electro-catalytic degradation of organic pollutants by facets exposed α-Fe2O3

采用溶剂热法和水热法分别调控合成2种不同晶面暴露的α-Fe2O3，通过X-射线粉末衍射、场发射扫描电子显微镜、高分辨透射电子显微镜等表征手段证实2种α-Fe2O3分别为{001}晶面暴露的纳米片和{110}晶面暴露的纳米棒结构。将2种α-Fe2O3应用于电-Fenton去除有机污染物,电催化降解测试表明，将2种α-Fe2O3分别负载在碳纤维（CF）上作为阴极材料降解罗丹明B、甲基蓝和阿特拉津等有机污染物时，均表现出稳定的去除能力，且{110}晶面暴露的α-Fe2O3纳米棒活性远高于{001}晶面暴露的α-Fe2O3纳米片。电化学分析结果表明，{110}晶面暴露的Fe2O3相比于{001}晶面暴露的α-Fe2O3，具有更强的电子传递能力，在通电条件下其表面的Fe(Ⅲ)更容易被还原成Fe(Ⅱ);而生成的Fe(Ⅱ)会进一步促进·OH和·O-2等含氧活性物质的生成，进而提高有机污染物的降解效率。
Different facets exposed α-Fe2O3 were synthesised and utilized to remove organic contaminants via electric-Fenton method. Systemic characterizations including X-ray diffraction (XRD),scanning electron microscope (SEM) and transimission electron microscope (TEM) reveal that the dominated planes of prepared α-Fe2O3 nanosheets and nanorods are {001} and {110} facets,respectively. Both 001-Fe2O3 and 110-Fe2O3 deposited CF cathode demonstrates sustainable activity for electrocatalytic removal of typical organic pollutants including RhB,MB and atrazine. The activity of 110-Fe2O3 is much higher than that of 001-Fe2O3. This can be attributed to its stronger ability for Fe(Ⅱ) generation based on the corresponding electrochemical analysis,from which the electron transport capacity of 110-Fe2O3 is found to be much higher than that of 001-Fe2O3. The resulting Fe(Ⅱ) thus accelerates the formation of reactive oxygen species like ·OH and·O-2,which subsequently promotes the degradation of target contaminants.