Effect of Copper Nitrate on the Preparation of α-Fe2O3 Powder and its Photo-catalytic Performance
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摘要: 以硝酸铁、硝酸铜、甘氨酸为原料，采用溶液燃烧合成一步制备了粒径约为30 nm的α-Fe2O3复合光催化纳米材料。采用XRD，SEM，TEM对α-Fe2O3复合粉末进行了表征，研究了硝酸铜含量对α-Fe2O3复合材料物相、形貌及光催化性能的影响。反应体系中加入硝酸铜后，制备得到α-Fe2O3/CuFe2O4复合光催化材料。硝酸铜的加入影响了反应时释放的能量，形貌由原来的絮片状变为片状。当添加量为1 g时，α-Fe2O3复合材料的光催化效果最优，在50 min内可以降解初始浓度为20×10-6的亚甲基蓝溶液。这是由于CuFe2O4带隙宽度较窄，能够吸收的太阳光更多，同时可以与α-Fe2O3形成异质结，提高光生电子和空穴的传输，降低光生电子和空穴的复合，从而提高了粉末的催化活性。Abstract: The α-Fe2O3 nano-composites with photo-catalytic activity were prepared by solution combustion synthesis using ferric nitrate,copper nitrate and glycine as raw materials.The grain size of α-Fe2O3 is about 30 nm.The products were characterized by XRD,SEM and TEM.The effects of copper nitrate content on phase morphology and photo-catalytic properties of α-Fe2O3 composites were studied.The addition of cupric nitrate affects the energy released during the reaction and the morphology changes from flocculent flaky to sheet.When the copper nitrate amount is 1g,the photo-catalytic performance of α-Fe2O3 composites material is optimal,and the MB solution with the initial concentration of 20×10-6 is degraded within 50 min.This is due to the narrow band gap width of CuFe2O4,which can absorb more sunlight.Meanwhile,it can form heterojunction with α-Fe2O3,improve the transmission of photo-generated electrons and holes,reduce the recombination of photo-generated electrons and holes,and thus improve the catalytic activity of powder.
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