The Preparation and Photocatalytic Properties of MoS2@ZnO Heterojunction Nanomaterials
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摘要: 本论文通过超声法制备了形貌均一的MoS2@ZnO异质结光催化材料. 采用X射线粉末衍射(XRD)、扫描电镜(SEM)、光致发光光谱（PL）、光电流密度测试等方法对样品的形貌和结构进行表征. 扫描电镜结果表明，MoS2@ZnO异质结复合材料是由直径约50～100 nm的ZnO纳米球包裹MoS2纳米片组成的. 光致发光光谱（PL）、光电流密度测试结果表明，MoS2(1.0%)@ZnO异质结能更有效地分离光生电子和空穴对，使得它们的复合机率降低，提高其光催化效率. 以初始质量浓度为15 mg/L的亚甲基蓝(MB)为模拟废水，研究纯ZnO纳米球和MoS2纳米片质量分数为0.5%、1.0%和2.0%的MoS2@ZnO异质结复合材料在250 W Xe灯下的光催化活性，研究结果表明 MoS2(1.0%)@ZnO 异质结材料对亚甲基蓝的光催化降解效率相比纯ZnO纳米球提高了15.2%. 并且经3次循环实验后，MoS2(1.0%)@ZnO异质结材料的光催化性基本不受影响，说明了MoS2(1.0%)@ZnO 异质结光催化材料的稳定性.Abstract: MoS2@ZnO heterojunction nanomaterials were synthesized by ultrasonic method．The structures and morphologies of MoS2@ZnO heterojunction were characterized by X-ray diffraction (XRD), scanning electron microscopy ( SEM), photoluminescence spectra (PL), and photocurrent density measurement. The SEM results shown that MoS2@ZnO heterojunction composite was composed of ZnO nanospheres about 50 ~ 100 nm in diameter wrapped in MoS2 nanosheets. The results of PL spectra, and photocurrent density measurement shown that the heterojunction between MoS2 and ZnO can effectively separate photogenerated electrons and hole, reduced their recombination probability, and improved their photocatalytic activity. The photocatalytic activity of ZnO, and MoS2@ZnO that the mass ratios of MoS2 were 0.5%、1.0% and 2.0% heterojunction nanomaterials were evaluated by the degradation of Methylene blue (MB) (15 mg/L) solution under 250 W Xe lamp irradiation, the results shown that photocatalytic degradation of MB by MoS2(1.0%)@ZnO heterojunction nanomaterials is 15.2% more efficient than pure ZnO. The photocatalytic stability and the reuse of the catalyst were crucial, recycled experiments for the photodegradation of MB were conducted to study the photostability of the MoS2@ZnO heterojunction nanomaterials, which the mass ratio of MoS2 was 1.0%. The photocatalytic activity of MoS2(1.0%)@ZnO had no significant change after three cycles, MoS2(1.0%)@ZnO exhibited excellent photostability.
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Keywords:
- MoS2@ZnO /
- heterojunction /
- methylene blue /
- photocatalysis
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