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Controlled synthesis and photocatalytic performance of biocompatible uniform carbon quantum dots with microwave absorption capacity

机译：具有微波吸收能力的生物相容性均匀碳量子点的可控合成和光催化性能

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摘要

Carbon quantum dots (CQDs) were successfully prepared via a facile microwave-assisted method combined with a controlled drainage time using glucose as the carbon source. XRD analysis, FT-IR spectroscopy, UV spectroscopy, XPS, and PL spectroscopy were performed to characterize the structures and properties of the samples. The results showed that the average particle size of the prepared CQDs was about 2 nm, and there were two UV absorption at the wavelengths of 228 nm and 280 nm, respectively, corresponding to the pi-pi* transition of C=C (atomic group) and the n-pi* transition of the oxygen containing group (C=O) on the surface of the carbon core. According to the unique optical and microwave absorption properties of the CQDs, a suitable photocatalytic system, namely, a microwave electrodeless discharge lamp (MEDL) system was used. In the MEDL system, the degradation rate of rhodamine B (RhB, 50 mL, 30 mg L-1) by 0.02 g CQDs-2 in 10 min could reach 85.79%. The photocatalytic activity of CQDs-2 was about twice that of P25. In addition, the biocompatibility of the CQDs was investigated, which revealed that the CQDs could be absorbed by microorganisms as a carbon source. The prepared CQDs are a promising environmentally friendly photocatalyst.
机译：碳量子点（CQDs）是通过一种简便的微波辅助方法结合葡萄糖的碳源控制排放时间而成功制备的。进行了XRD分析，FT-IR光谱，UV光谱，XPS和PL光谱以表征样品的结构和性质。结果表明，制备的CQD的平均粒径约为2 nm，分别在228 nm和280 nm的波长处有两个UV吸收，对应于C = C的pi-pi *跃迁（原子团）和碳核表面上含氧基团（C = O）的n-pi *跃迁。根据CQD独特的光学和微波吸收特性，使用了合适的光催化系统，即微波无电极放电灯（MEDL）系统。在MEDL系统中，若在10分钟内用0.02 g CQDs-2降解若丹明B（RhB，50 mL，30 mg L-1），降解率可达到85.79％。 CQDs-2的光催化活性约为P25的两倍。另外，对CQDs的生物相容性进行了研究，结果表明CQDs可以被微生物作为碳源吸收。制备的CQD是一种有前途的环保光催化剂。

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  • 来源
    《Applied Surface Science》 |2020年第may15期|145751.1-145751.9|共9页
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  • 作者单位

    Heilongjiang Univ Key Lab Funct Inorgan Mat Chem Minist Educ Sch Chem & Mat Sci Harbin 150080 Heilongjiang Peoples R China;

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  • 正文语种 eng
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  • 关键词

    CQDs; Microwave; Photocatalytic; Biocompatibility;

    机译：CQD;微波;光催化;生物相容性;

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