| 纺锤形BiVO4微米管：低温离子熔盐合成及光催化性能 |
| Spindle Like BiVO4 Microtubes： Synthesis in Deep Eutectic Solvent and Photocatalytic Properties |
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| 摘要: 以Bi(NO3)3·5H2O和NH4VO3为原料，以氯化胆碱和尿素组成的低温离子熔盐为反应介质，采用离子热合成法成功制备出了具有纺锤状外形的BiVO4微米管。利用XRD，SEM，UV-Vis DRS，光催化测试等手段考察了BiVO4颗粒的物相、形貌和光催化性能。结果表明，在离子熔盐环境下可以制备出结晶良好的BiVO4纺锤形微米管，该BiVO4微米管长10~15 μm，直径为1.5 μm左右，管壁厚约为200 nm。同时，研究了pH值对BiVO4颗粒物相与形貌的影响，发现随着pH值的变化可分别合成出具有柱状、纺锤形微米管、柱状微米管和针柱状单斜相BiVO4颗粒。光催化测试结果表明，这些单斜白钨矿BiVO4颗粒在可见光范围都具有一定的光催化活性，其中纺锤状微米管对罗丹明B的降解效果最佳，可见光照射4.5 h后罗丹明B的降解率可达到93％。 |
| 关键词: 钒酸铋 离子热合成 纺锤形微米管 光催化 |
| 基金项目: |
| Abstract: Spindle like crystalline bismuth vanadate(BiVO4) microtubes were ionothermally synthesized in the deep eutectic solvent(DES) of choline chloride/urea mixture. The crystal phases, morphology and photocatalytic property of as-prepared products were characterized by XRD, SEM, UV-Vis DRS and photocatalytic tsets. The results show that the crystalline monoclinic BiVO4 spindle like microtubes with a length of 10~15 μm, a diameter of ca.1.5 μm and a wall thickness of 200 nm, were obtained at 150 ℃ for 15 h. In addition, the effect of pH value on the phase and morphology of samples was studied. The monoclinic BiVO4 samples with rod, spindle like microtubes, microtubes or needle shapes could be obtained by controlling the pH value in the synthesis process. A much higher photocatalytic activity of the spindle like microtubes is found under visible light irradiation with a 93% degradation of rhodamin B after visible light irradiation for 4.5 h. |
| Keywords: BiVO4 deep eutectic solvent spindly microtube photocatalyst |
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| 柳 伟,于亚芹,曹立新,苏 革,张 岚,王永刚.纺锤形BiVO4微米管：低温离子熔盐合成及光催化性能[J].无机化学学报,2010,26(3):379-384. |
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