摘要
以Na_2WO_4·2H_2O和Pb(NO_3)_2为前驱体,利用不同的修饰剂以及超声辅助下于常温合成了不同形貌的PbWO_4纳米粒子,通过X射线粉末衍射、扫描电镜、透射电镜、紫外-可见漫反射光谱等对其结构、形貌进行了表征。测定了不同形貌的样品在近紫外光(λ≥310 nm)下的光催化活性。结果表明:不同修饰剂下制得的样品均为纳米PbWO_4晶体,形貌各不相同。无修饰剂条件下制得的样品可在紫外光下90min内降解20mg/L的橙黄Ⅱ溶液。电子泛函理论计算可知,PbWO_4催化剂的紫外吸收带可归结为O2p轨道向W5d轨道跃迁所产生的。
Using Na2WO4·2H2O and Pb（NO3）2 as precursors and adding different modifiers, nanocrystalline lead tungstate （PbWO4） nanopowders were synthesized by an ultrasonic assisted process at room temperature. The structure, morphology and spectral property of samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and ultraviolet-visible diffuse reflection spectroscopy （UV-Vis DRS）. The photocatalytic activities of samples with different morphology were evaluated under near-UV light irradiation （λ≥310 nm）. The results show that the samples with different modifiers are all PbWO4 nanocrystals and have different morphologies. The sample prepared without modifier can completely degrade 20 mg/L orange Ⅱ solution under near-UV light irradiation for 90 min. The density functional theory calculation result shows that the absorption of PbWO4 in the UV region can be explained by the transition of the O2p orbital to a W 5d orbital.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第11期1503-1507,共5页
Journal of The Chinese Ceramic Society
基金
江苏省社会发展基金(BS2006038)资助项目。
关键词
超声合成
钨酸铅
光催化剂
ultrasonic synthesis
lead tungstate
photocatalyst
