| 不同晶型Bi2O3可见光光催化降解罗丹明B的研究 |
| Visible-Light Photocatalytic Degradation of RhB by Bi2O3 Polymorphs |
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| 摘要: 采用化学沉淀法制备了α、β、γ 3种晶体结构的Bi2O3光催化剂。利用XRD、TEM、氮气吸附、TG-DSC、紫外-可见漫反射光谱对样品的晶体结构、微观形貌、光学吸收特性进行了表征，并以罗丹明B(RhB)作为模型污染物，研究了不同的粉体光催化剂在可见光(λ>420 nm)照射下的光催化能力。结果表明：制备的α-Bi2O3为长3 μm、宽1 μm的板条状颗粒，带隙为2.84 eV；β-Bi2O3为粒径约150 nm的不规则颗粒，带隙为2.75 eV；γ-Bi2O3为直径6 nm、长度150~200 nm的纳米管，带隙为2.68 eV。在可见光照射下Bi2O3光催化降解RhB的活性如下：γ-Bi2O3>β-Bi2O3>α-Bi2O3，其中γ-Bi2O3在辐照60 min后对罗丹明B的脱色率可达97%以上。 |
| 关键词: Bi2O3 可见光 光催化 纳米管 |
| 基金项目: |
| Abstract: The α, β, and γ-Bi2O3 were obtained by a chemical precipitation method. The crystal structures, morphologies and optical properties of Bi2O3 polymorphs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption method, thermal gravimetry-differential scanning calorimetry (TG-DSC) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The photocatalytic performance of Bi2O3 was evaluated using rhodamine B (RhB) as a model pollutant under visible light illumination (λ>420 nm). The result showed that the lath-shaped α-Bi2O3 with a band gap of 2.84 eV was 3 μm in length and 1 μm in width; the irregular β-Bi2O3 with a band gap of 2.75 eV had a particle size of approximately 150 nm; the nanotube γ-Bi2O3 with a band gap of 2.68 eV was 6 nm in diameter and 150 nm to 200 nm in length. The photocatalytic degradation of RhB by Bi2O3 polymorphs under visible light illumination were as follows: γ-Bi2O3>β-Bi2O3>α-Bi2O3. The γ-Bi2O3 nanotube exhibited the best photocatalytic performance which can effectively degrade 97% RhB within 60 min. |
| Keywords: Bi2O3 visible light photocatalytic nanotube |
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| 邹 文,郝维昌,信 心,王天民.不同晶型Bi2O3可见光光催化降解罗丹明B的研究[J].无机化学学报,2009,25(11):1971-1976. |
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