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首页> 外文期刊>Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications >CO3O4 nanoparticles assembled coatings synthesized by different techniques for photo-degradation of methylene blue dye
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CO3O4 nanoparticles assembled coatings synthesized by different techniques for photo-degradation of methylene blue dye

机译：不同技术合成的CO3O4纳米粒子组装涂料对亚甲基蓝染料的光降解

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摘要

CO3O4 nanoparticles assembled coatings have been synthesized by physical (pulsed laser deposition (PLD) and electron beam deposition) and chemical (sol-gel and electroless) techniques. The morphological, structural, and optical properties of all the coatings were analyzed by SEM, XRD, Raman spectroscopy, XPS, and UV-vis spectroscopy. The catalytic activities of the several Co3O4 heterogeneous catalyst coatings have been compared by looking at their efficiency on degradation of methylene blue dye that occurs via photo Fenton reaction in presence of H2O2 or oxone oxidants. The coating synthesized by PLD exhibits the best photo-degradation rate of dye in presence of H2O2 (4 h) or oxone (8min). The NPs produced by PLD process exhibit smaller average size (18 nm), narrow size distribution (σ = 3 nm), perfect spherical shape, low degree of agglomeration, and mixed amorphous-nanocrystalline phase. These special features of NPs, along with better visible light absorption, are the main factors responsible for the enhanced photocatalytic activity of the PLD CO3O4 NPs assembled coating. It is also observed that although the concentration of oxone (0.5 mM) was very small as compared to H2O2 (100 mM) the photo-degradation of MB dye solution is much faster for oxone.
机译：已通过物理（脉冲激光沉积（PLD）和电子束沉积）和化学（溶胶-凝胶和化学镀）技术合成了CO3O4纳米颗粒组装涂层。通过SEM，XRD，拉曼光谱，XPS和UV-vis光谱分析所有涂层的形态，结构和光学性质。通过观察几种Co3O4非均相催化剂涂层对亚甲基蓝染料降解的效率进行了比较，这些降解是通过在H2O2或oxone氧化剂存在下通过光芬顿反应进行的。在H2O2（4 h）或oxone（8min）的存在下，PLD合成的涂层表现出最佳的染料光降解速率。通过PLD工艺生产的NP表现出较小的平均尺寸（18 nm），窄的尺寸分布（σ= 3 nm），完美的球形，低聚集度以及混合的非晶-纳米晶相。 NP的这些特殊功能以及更好的可见光吸收是造成PLD CO3O4 NP组装涂层增强光催化活性的主要因素。还观察到，尽管与H2O2（100 mM）相比，丙酮（0.5 mM）的浓度非常小，但是MB染料溶液的光降解对于丙酮而言要快得多。

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