Photodegradation of Azo Dyes in Sunlight Promoted by Nitrogen–Sulfur–Phosphorus Codoped Carbon Dots,ACS Applied Nano Materials

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Photodegradation of Azo Dyes in Sunlight Promoted by Nitrogen–Sulfur–Phosphorus Codoped Carbon Dots
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2021-08-24 , DOI: 10.1021/acsanm.1c01810
Deepika Saini ₁ , Ruchi Aggarwal ₁ , Amit Kumar Sonker ₂ , Sumit Kumar Sonkar ₁

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Removal of organic contaminants such as azo dyes is highly desirable because of their toxicity, stability, and mutagenic properties. Herein an efficient method for the photodegradation of two well-known model azo dyes, namely metanil yellow (MY) and methyl orange (MO), under sunlight by multiple-heteroatom-doped carbon dots (CD) (nitrogen-, sulfur-, and phosphorus-doped-CD (NSP-CD)) is presented. The photodegradation results favored sunlight as a sustainable light source, as its value of t_1/2 is significantly less than that of artificial light (100 W tungsten bulb). Various parameters, such as the concentrations of individual dyes (20–100 ppm), a mixture of both dyes, changes in pH, and foreign/interfering ions, were investigated to understand the photocatalytic activity of NSP-CD. Under sunlight, photodegradation of ∼20 ppm of dye was observed in ∼60 min (for MY) and ∼90 min (for MO), respectively. A comparative NMR investigation was performed to confirm the photodegradation of the complex structural framework of azo dyes by NSP-CD. Moreover, to explore the real-life utility of the process, sunlight-promoted photodegradation experiments were conducted by externally spiking four different types of industrial samples. Spiking of MY and MO dyes with concentrations in the range of ∼15–23 ppm showed similar results of photodegradation.

中文翻译：

氮-硫-磷共掺杂碳点促进偶氮染料在阳光下的光降解

由于偶氮染料的毒性、稳定性和致突变性，因此非常需要去除有机污染物，例如偶氮染料。这是一种在阳光下通过多杂原子掺杂的碳点 (CD)（氮、硫和介绍了掺磷-CD (NSP-CD))。光降解结果有利于阳光作为可持续光源，因为其t _1/2值明显低于人造光（100 W 钨丝灯泡）。研究了各种参数，例如单个染料的浓度 (20-100 ppm)、两种染料的混合物、pH 值的变化以及外来/干扰离子，以了解 NSP-CD 的光催化活性。在阳光下，分别在约 60 分钟（对于 MY）和约 90 分钟（对于 MO）内观察到约 20 ppm 染料的光降解。进行了比较 NMR 研究以确认 NSP-CD 对偶氮染料的复杂结构框架的光降解。此外，为了探索该过程的实际效用，通过外部加标四种不同类型的工业样品进行了阳光促进的光降解实验。掺入浓度在 15-23 ppm 范围内的 MY 和 MO 染料显示出类似的光降解结果。

更新日期：2021-09-24

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