Enlei Zhang, Lijie Wang, Bengui Zhang, Chuanbi Sun, Ying Zhang, Guosheng Wang
College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, People's Republic of China.
J Nanosci Nanotechnol. 2018 Apr 1;18(4):2637-2642. doi: 10.1166/jnn.2018.15191.
Different morphologies hematite (α-Fe2O3) nanocrystals were synthesized by hydrothermal process and subsequent calcination treatment. The crystal structure and shape of the products were confirmed by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Fenton oxidation degradation of Congo red (CR) was carried out with α-Fe2O3 nanocrystals with different morphologies to compare their catalytic performance. The result shows that CR can be degraded above 90% after 2 h by using α-Fe2O3 nanorods. In addition, degradation efficiencies of α-Fe2O3 nanocrystals with different morphologies towards CR were also investigated. It reveals that α-Fe2O3 nanorods with exposed {210} and {001} planes exhibited superior Fenton oxidation performance to that of nanoparticles. It is traceable to the higher density of Fe3+ exposed on the {210} and {001} planes of nanorods than that of other morphologies crystals. The mechanism of Fenton oxidation and kinetics analysis were extensively studied.
通过水热法和后续煅烧处理合成了不同形貌的赤铁矿（α-Fe2O3）纳米晶体。通过X射线衍射（XRD）和透射电子显微镜（TEM）确定了产物的晶体结构和形状。用不同形貌的α-Fe2O3纳米晶体进行刚果红（CR）的芬顿氧化降解，以比较它们的催化性能。结果表明，使用α-Fe2O3纳米棒在2小时后CR的降解率可高于90%。此外，还研究了不同形貌的α-Fe2O3纳米晶体对CR的降解效率。结果表明，暴露{210}和{001}面的α-Fe2O3纳米棒表现出比纳米颗粒更优异的芬顿氧化性能。这可追溯到纳米棒{210}和{001}面上暴露的Fe3+密度高于其他形貌晶体。对芬顿氧化机理和动力学分析进行了广泛研究。
