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Green synthesis of biomass-derived carbon quantum dots for photocatalytic degradation of methylene blue

机译:生物质衍生碳量子点的绿色合成用于光催化降解亚甲蓝

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摘要

Water pollution, significantly influenced by the discharge of synthetic dyes from industries, such as textiles, poses a persistent global threat to human health. Among these dyes, methylene blue, particularly prevalent in the textile sector, exacerbates this issue. This study introduces an innovative approach to mitigate water pollution through the synthesis of nanomaterials using biomass-derived carbon quantum dots (CQDs) from grape pomace and watermelon peel. Utilizing the hydrothermal method at temperatures between 80 and 160 °C over periods ranging from 1 to 24 h, CQDs were successfully synthesized. A comprehensive characterization of the CQDs was performed using UV–visible spectroscopy, Fourier-transform infrared spectroscopy, dynamic light scattering, Raman spectroscopy, and luminescence spectroscopy, confirming their high quality. The photocatalytic activity of the CQDs in degrading methylene blue was evaluated under both sunlight and incandescent light irradiation, with measurements taken at 20 min intervals over a 2 h period. The CQDs, with sizes ranging from 1–10 nm, demonstrated notable optical properties, including upconversion and down-conversion luminescence. The results revealed effective photocatalytic degradation of methylene blue under sunlight, highlighting the potential for scalable production of these cost-effective catalytic nanomaterials for synthetic dye degradation.
机译:水污染受到纺织等工业排放合成染料的严重影响,对人类健康构成持续的全球威胁。在这些染料中,亚甲蓝尤其普遍地存在于纺织行业,加剧了这一问题。本研究介绍了一种创新方法,通过使用葡萄渣和西瓜皮中的生物质衍生碳量子点 (CQD) 合成纳米材料来减轻水污染。利用水热法在 80 至 160 °C 的温度下 1 至 24 h 成功合成了 CQDs。使用紫外-可见光谱、傅里叶变换红外光谱、动态光散射、拉曼光谱和发光光谱对 CQD 进行了全面表征,证实了它们的高质量。在阳光和白炽灯照射下评估 CQDs 在降解亚甲蓝中的光催化活性,在 2 小时内以 20 分钟的间隔进行测量。尺寸范围为 1-10 nm 的 CQD 表现出显著的光学特性,包括上转换和下转换发光。结果揭示了亚甲基蓝在阳光下的有效光催化降解,突出了这些具有成本效益的催化纳米材料用于合成染料降解的可扩展生产的潜力。

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