中文摘要：

以Bi（NO3）3·5H2O、NaVO3和La（N03）3．5H20为原料，以葡萄糖为结构导向剂，通过水热法制备La掺杂BiV04微米球。采用XRD、XPS、SEM、FTIR、UV-Vis、BET、光催化技术等对产品进行了表征和分析。结果表明，采用葡萄糖（2．0g）辅助水热法能合成结晶度高且形貌规整的单斜白钨矿La／BiV04微米球，微米球直径范围为2-9gm，均由尺寸为30-65nm纳米颗粒自组装而成。相比BiV04块状颗粒，球状La/BiVO4的紫外一可见光吸收边发生了稍许红移，具有较小的能带隙（〈2．4eV），其中，2．0％La／BiV04（质量分数）微米球表现出最高的光催化活性，其速度常数k为5．63×10^-2min^-1，可见光照射10mg／L亚甲基蓝溶液60min时的光解率达100％。

英文摘要：

Using Bi（NO3）3·5H2O, NaVO3 and La（NO3）3·5H2O as raw materials, La-doped BiVO4 microspheres were characterized and analyzed by hydrothermal process with glucose as the template. The as-prepared samples were investigated by XRD, XPS, SEM, FTIR, UV-Vis, BET and photocatalysis techniques. The results reveal that uniform, well crystallized and microspherical La/BiVO4 monoclinic crystal with the diameter range of 2-9 μm, which is self-assembled by lots of nanoparticles with the size of 30-65 nm, can be obtained via a hydrothermal route assisted by 2.0 g glucose. Compared with BiVO4 irregular particles, La/BiVO4 microspheres show a little red shift in the absorption band, resulting in a narrowed band gap （〈2.4 eV）. For 2.0% La/BiVO4 （mass fraction） microspheres, its photodegradation rate constant k is 5.63 ×10^-2min^-1 and the best photocatalytic activity is found with a 100% degradation of methylene blue （MB） with a concentration of 10 mg/L under visible-light irradiation for 60 min.