Ag/BiVO_4脱氮光催化剂的制备与表征  

Preparation and Characterization of Ag/BiVO_4 Photocatalyst for Denitrification

作　　者：黄莹莹[1] 郑柳萍[1] 颜桂炀[1,2] 李玲[1] 

机构地区：[1]福建师范大学化学与化工学院,福建福州350007 [2]宁德师范学院,福建宁德352100

出　　处：《石油化工》2013年第4期441-444,共4页Petrochemical Technology

基　　金：福州市科技计划项目(CE0015);宁德师范学院服务海西项目(2010H103)

摘　　要：以硝酸铋为铋源、偏钒酸铵为钒源,采用水热法制备了Ag掺杂改性的粉体钒酸铋(Ag/BiVO4)催化剂,采用XRD,UV-Vis DRS,SEM等手段对其理化性能进行了表征,并以模拟含氮油品为目标降解物,在可见光下评价其光催化脱氮性能。表征结果显示,Ag掺杂不会改变BiVO4催化剂典型的单斜白钨矿结构,可提高Ag/BiVO4催化剂对可见光的吸收能力,从而使其催化性能明显优于未改性的BiVO4催化剂,对模拟油品中的吡啶表现出良好的可见光降解效果。对于50 mL吡啶含量为50μg/g的模拟油品,当Ag掺杂量(理论计算值)为5%(w)时,催化剂最佳用量为0.05 g,在可见光下照射2.5 h,模拟油品中吡啶的降解率可达86.7%。Ag/BiVO4 powder photocatalysts were prepared by a hydrothermal method from bismuth nitrate, ammonium metavanadate and silver nitrate, and characterized by means of XRD, UV-Vis DRS and SEM. Their photocatalytic activity for oil denitrification under visible light was evaluated with pyridine degradation as the probe reaction. The results showed that the Ag doping did not change the typical monoclinic scheelite structure of BiVO4 but improved the visible light absorption of the catalysts. So the photocatalytic activity of Ag/BiVO4 for the degradation ofpyridine under visible light was evidently higher than that of the BiVO4. The photocatalytic degradation rate of 50 pg/g pyridine（50 mL pyridine solution） could reach 86.7% under the conditions of Ag doping amount（theoretical value） 5%（w）, Ag/BiVO4 dosage 0.05 g and visible light irradiation for 2.5 h.

关 键 词：银 钒酸铋催化剂 光催化 油品脱氮 吡啶 

分 类 号：TQ426[化学工程]