含Gd^(3+)双金属共掺杂铁酸铋的制备及其光催化

Co-doped-BiFeO_(3) with Bimetallic Elements Containing Gd^(3+):Preparation and Photo-catalytic Properties

文章以具有多个配位点的多胺羧酸H_(5)DTPA为配体,采用配位前驱体低温热分解方法对铁酸铋进行A位、AB位双金属共掺杂改性,分别制备出铁酸铋粉末Bi_(0.90)Gd_(0.05)M_(0.05)FeO_(3)和Bi_(0.95)Gd_(0.05)Fe_(0.95)N_(0.05)O_(3)(M=Li^(+),Ca^(2+),Al^(3+);N=Co^(2+),Mn^(2+))。利用XRD、FT-IR、SEM、FL、电化学分析等手段研究掺杂离子种类对铁酸铋结构、形貌、光学性质、电化学性质等的影响。结果表明,掺杂后的样品均为两相共存,其中主相为六方R3c型BiFeO_(3),晶粒大小在20 nm左右,第二掺杂离子对铁酸铋结晶度影响较大。同时,以甲基橙(MO)为染料模型进行光降解测试,结果表明,共掺杂后产物的光催化性能均有所提高,其中,Co^(2+)与Gd^(3+)共掺杂催化效果最好,20 mg/L的MO在其催化下光照3 h后降解率能达68%。另外,所有掺杂产物都表现出优良的磁性。

This paper introduces co-doped bismuth ferrite,a novel photo-catalyst(Bi_(0.90)Gd_(0.05)M_(0.05)FeO_(3) and Bi_(0.95)Gd_(0.05)Fe_(0.95)N_(0.05)O_(3)(M=Li^(+)、Ca^(2+)、Al^(3+);N=Co^(2+)、Mn^(2+)),which was prepared by the low-temperature thermal decomposition method,and modified by co-doping in A and AB positions.Instruments such as XRD,FT-IR,SEM and FL were used,and electro-chemical test were performed to research the effects of doped-ion types on phase,morphology,optical properties,and electro-chemical properties of bismuth ferrite.The results presented that all co-doped samples were two-phase coexistence,and the main phase was hexagonal R3c BiFeO_(3),the grain size being about 20 nm;the crystallinity of bismuth ferrite was affected by the type of doped ions;at the same time,the catalytic activity of all prepared samples were carried out by using methyl orange(MO)as dye model.In summary,the photo-catalytic performance of all samples were improved after the co-doping,of which Co^(2+)and Gd^(3+)co-doped BiFeO_(3) was the best in catalytic activity:the degradation rate of MO(20 mg/L)could attain 68%under the light irradiation for the time of three hours.In addition,all co-doped products exhibited excellent magnetic properties.