具有可见光催化活性的MoS2量子点/NH2-MIL-125复合材料的制备及性能表征

doi:10.15541/jim20190010

摘要/Abstract

摘要：

采用水热法合成金属-有机骨架材料NH₂-MIL-125, 并修饰硫化钼量子点, 从而构筑具有增强电荷分离的二硫化钼量子点/NH₂-MIL-125复合光催化材料(MoS₂ QDs/NH₂-MIL-125)。利用XRD、HRTEM、DRS、PL对材料性能进行分析, 通过降解甲基橙MO染料测试MoS₂ QDs/NH₂-MIL-125复合材料的光催化性能。结果表明：尺寸约 4 nm的MoS₂ QDs均匀分散在NH₂-MIL-125上, 在可见光照射下, MoS₂ QDs/NH₂-MIL-125复合材料的光催化性能极大优于单一的Bulk MoS₂和NH₂-MIL-125, 降解常数分别是它们的5.8和7.4倍。循环光催化实验结果表明, MoS₂ QDs/NH₂-MIL-125复合材料的光催化能力具有良好的稳定性。DRS和PL的测试结果表明, MoS₂ QDs/NH₂-MIL-125复合材料优异的可见光催化性能主要归因于异质结构的形成, 抑制了光生电子-空穴的复合, 进而提高了光催化性能。

关键词: 二硫化钼量子点, 金属-有机骨架材料, 异质结构, 光催化

Abstract:

MoS₂ quantum dots (QDs) decorated NH₂-MIL-125 (MoS₂ QDs/NH₂-MIL-125) heterostructures were successfully fabricated by a facile method. XRD results exhibit that NH₂-MIL-125 and MoS₂ form crystals in the synthesis process of MoS₂ QDs/NH₂-MIL-125 heterojunctions. TEM results demonstrated clearly that the MoS₂ Quantum dots with size of about 4 nm successfully disperse on the surface of NH₂-MIL-125 plate. Compared with bulk MoS₂ and NH₂-MIL-125, the MoS₂ QDs/NH₂-MIL-125 heterostructures exhibit enhanced photocatalytic performance in degradation of methyl orange under visible light irradiation, about 5.8 and 7.4 times higher that of pure bulk MoS₂ and NH₂-MIL-125, respectively. Meanwhile, MoS₂ QDs/NH₂-MIL-125 composites exhibit good stability and reusability during cycle experiment. The excellent photocatalytic activity of MoS₂ QDs/NH₂-MIL-125 heterostructures is attributed to the formation of heterojunctions between MoS₂ QDs and NH₂-MIL-125, Tacilitating separation of the photogenerated charge carries. PL results prove that MoS₂ QDs/NH₂-MIL-125 composites own lower recombination of photogenerated electrons and holes, resulting in superior photocatalytic ability.

Key words: MoS₂ quantum dots(QDs), metal-organic frameworks, heterojunction, photocatalysis

中图分类号:

TB34

韩丽, 张晓敏, 吴德勇. 具有可见光催化活性的MoS₂量子点/NH₂-MIL-125复合材料的制备及性能表征[J]. 无机材料学报, 2019, 34(11): 1205-1209.

HAN Li, ZHANG Xiao-Min, WU De-Yong. MoS₂ Quantum Dots Decorated NH₂-MIL-125 Heterojunction: Preparation and Visible Light Photocatalytic Performance[J]. Journal of Inorganic Materials, 2019, 34(11): 1205-1209.

图/表 5

Fig. 1 TEM images (a, b), HRTEM images (c, d) and the partial element mappings (e, f) of MoS2 QDs/NH2-MIL-125 composites

Fig. 2 XRD patterns of bulk MoS2, NH2-MIL-125 and MoS2 QDs/NH2-MIL-125 composites

Fig. 3 (a) Photocatalytic activity and (b) plot of -ln(C/C0) of bulk MoS2, NH2-MIL-125 and MoS2 QDs/NH2-MIL-125 composites over MO as a function of irradiation time

Fig. 4 UV-Vis diffuse reflectance spectra (a) and PL spectra (b) of NH2-MIL-125 and MoS2 QDs/NH2-MIL-125 composites

Fig. 5 Stability test of MoS2 QDs/NH2-MIL-125 composites for MO degradation under visible light irradiation

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具有可见光催化活性的MoS₂量子点/NH₂-MIL-125复合材料的制备及性能表征

MoS₂ Quantum Dots Decorated NH₂-MIL-125 Heterojunction: Preparation and Visible Light Photocatalytic Performance

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