(1. 玉林師范學院 新材料研發(fā)和化學生物傳感技術所，玉林 53700；
2. 中南大學 粉末冶金國家重點實驗室，長沙 410083；
3. 中南大學 化學化工學院，長沙 410083)
摘 要: 以Bi(NO3) 3·5H2O和NH4VO3為原料，EDTA為絡合劑，輔助水熱法合成BiVO4方形納米片；采用X 射線衍射(XRD)、掃描電鏡(SEM)、高分辨透射電鏡(HRTEM)、拉曼光譜(Raman)、紫外−可見漫反射光譜(DRS)、比表面分析(BET)等測試手段對產(chǎn)品進行表征和分析；探討pH值對BiVO4顆粒物相與形貌的影響。結果表明：EDTA輔助水熱法能夠合成結晶良好單斜白鎢礦BiVO4方形納米片，該BiVO4方形納米片寬度約為0.6~1.0 μm，厚度約為200~300 nm；相比m-BiVO4顆粒，該片狀樣品的紫外−可見光吸收邊稍微發(fā)生紅移，其能帶隙減小至2.37 eV；變化溶液pH值可制備出片狀、方片狀、方塊狀和磚塊狀BiVO4顆粒。這些BiVO4顆粒在可見光范圍內(nèi)都具有一定的光催化活性，其中BiVO4方形納米片對亞甲基藍具有最強的可見光催化降解活性，可見光照射120 min后濃度為10mg·L−1亞甲基藍溶液的降解率可達到100 %。
關鍵字: BiVO4；水熱法；EDTA；光催化性能
（1. Institute of Advanced Materials and Chembiosensing Technology, Yulin Normal University, Yulin 537000, China;
2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
3. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:Using Bi(NO3)3·5H2O and NH4VO3 as raw materials, square BiVO4 nanosheet were synthesized by hydrothermal method with ethylenediamine tetraacetic acid (EDTA) as chelating agent. The properties of the as-prepared samples were investigated by XRD, SEM, HRTEM, Raman, DRS and BET tests. The effect of pH on the phase and morphology of samples was studies. The results show that high crystallinity BiVO4 nanosheet shapes with crystalline monoclinic structure, whose width varies in the range of 0.6−1.0 μm and length in the range of 200−300 nm, can be obtained via a hydrothermal route assisted by EDTA. Compared with m-BiVO4 particle, the absorption band of the microrod assisted by 2.0 g EDTA presents a little red shift and its band gap is narrowed to 2.37 eV. The BiVO4 samples with platelike, square shape, square massive, brick-shaped structure can be obtained by controlling the pH value in the synthesis process. These BiVO4 samples have certain photocatalytic activity under the visible light irradiation. A much higher photocatalytic activity of the square nanosheet is found under visible light irradiation with a 100% degradation of methylene blue (MB) of 10 mg·L−1 solution after visible light irradiation for 120 min.
Key words: BiVO4; hydrothermal synthesis; EDTA; photocatalyst property
