BiFe_(1-x)Mn_(x)O_(3)纳米粉末的制备及光催化性能  

Preparation and Photocatalytic Properties of BiFe_(1-x)Mn_(x)O_(3)Nano-powders

作　　者：杜泽 赵尉伶 匡代洪 侯亮[1] 严超 杨方源 DU Ze;ZHAO Yuling;KUANG Daihong;HOU Liang;YAN Chao;YANG Fangyuan(College of Resources and Environment,Xinjiang Agricultural University,Urumqi 830052,China;College of Mathematics and Physics,Xinjiang Agricultural University,Urumqi 830052,China)

机构地区：[1]新疆农业大学资源与环境学院,乌鲁木齐830052 [2]新疆农业大学数理学院,乌鲁木齐830052

出　　处：《材料导报》2023年第13期56-63,共8页Materials Reports

基　　金：新疆维吾尔自治区自然科学基金(2022D01A201)。

摘　　要：采用溶胶凝胶法制备了一系列BiFe_(1-x)Mn_(x)O_(3)(x=0.000、0.015、0.020、0.025、0.030)纳米粉末,利用XRD、SEM、BET、XPS、DRS、PL、VSM等对样品进行表征分析。结果表明,掺Mn的BiFeO_(3)晶粒尺寸和光致发光强度有不同程度的减小,比表面积和总孔容增加;磁性增强,便于回收利用;掺入的Mn以Mn 4+的形式均匀存在,氧空位或表面吸附氧增加,Fe^(2+)所占比例减小。光催化性能研究结果表明:Mn的掺杂提高了BiFeO_(3)对刚果红的光催化降解效率,尤其在550℃煅烧下制备的掺杂2%Mn的BiFeO_(3)纳米粉末对刚果红的去除率达到93%,使污水中的化学需氧量(COD)浓度下降51%;随着pH的降低,光催化效果不断增强,当pH为4时,光照30 min刚果红就完全被降解;无机阴离子HCO 3-和H 2PO 4-对光催化降解刚果红的抑制效果最明显。最后光催化机理探究实验表明在BiFeO_(3)中起光催化作用的主要活性物种是H 2O 2和·OH。BiFe_(1-x)Mn_(x)O_(3)nanopowder samples(x=0.000,0.015,0.020,0.025,0.030)were prepared by the sol-gel method.The characters of the samples were analyzed by XRD,SEM,BET,XPS,DRS,PL,VSM,and so on.The results showed that the grain size and photoluminescence intensity of Mn-doped BiFeO_(3)were decreased in different degree compared with BiFeO_(3),and the specific surface area and total pore volume were both increased.Meanwhile,Mn-doped BiFeO_(3)had stronger magnetism,which was recycled easily.The doped Mn was existed in the form of Mn 4+,oxygen vacancy or adsorbed oxygen was increased,and the proportion of Fe^(2+)was decreased in BiFeO_(3).The photocatalytic performance research results show that the photocatalytic degradation efficiency of Congo red was increased in Mn-doped BiFeO_(3).Especially,the removal rate of Congo red was reached 93%for 2%Mn-doped BiFeO_(3)nanopowders prepared at 550℃,and the COD concentration in sewage was reduced by 51%.The photocatalytic effect of Mn-doped BiFeO_(3)was enhanced with the decrease of pH value of the solution.The Congo red was completely degraded by illumination for 30 min at pH=4.The most obvious inhibitory effects on the photocatalytic degradation of Congo red were HCO 3-and H 2PO 4-.Finally,the photocatalytic mechanism exploration experiments showed that the main active species in photocatalysis of BiFeO_(3)were H 2O 2 and·OH.

关 键 词：BiFeO_(3) 掺杂 光催化 刚果红 COD 

分 类 号：O643[理学—物理化学]