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首页> 美国卫生研究院文献>Beilstein Journal of Nanotechnology >Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation
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Sugarcane juice derived carbon dot–graphitic carbon nitride composites for bisphenol A degradation under sunlight irradiation

机译：甘蔗汁衍生的碳点-石墨碳氮化物复合物在阳光照射下降解双酚A

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Carbon dots (CDs) and graphitic carbon nitride (g-C3N4) composites (CD/g-C3N4) were successfully synthesized by a hydrothermal method using urea and sugarcane juice as starting materials. The chemical composition, morphological structure and optical properties of the composites and CDs were characterized using various spectroscopic techniques as well as transmission electron microscopy. X-ray photoelectron spectroscopy (XPS) results revealed new signals for carbonyl and carboxyl groups originating from the CDs in CD/g-C3N4 composites while X-ray diffraction (XRD) results showed distortion of the host matrix after incorporating CDs into g-C3N4. Both analyses signified the interaction between g-C3N4 and CDs. The photoluminescence (PL) analysis indicated that the presence of too many CDs will create trap states at the CD/g-C3N4 interface, decelerating the electron (e−) transport. However, the CD/g-C3N4(0.5) composite with the highest coverage of CDs still achieved the best bisphenol A (BPA) degradation rate at 3.87 times higher than that of g-C3N4. Hence, the charge separation efficiency should not be one of the main factors responsible for the enhancement of the photocatalytic activity of CD/g-C3N4. Instead, the light absorption capability was the dominant factor since the photoreactivity correlated well with the ultraviolet–visible diffuse reflectance spectra (UV–vis DRS) results. Although the CDs did not display upconversion photoluminescence (UCPL) properties, the π-conjugated CDs served as a photosensitizer (like organic dyes) to sensitize g-C3N4 and injected electrons to the conduction band (CB) of g-C3N4, resulting in the extended absorption spectrum from the visible to the near-infrared (NIR) region. This extended spectral absorption allows for the generation of more electrons for the enhancement of BPA degradation. It was determined that the reactive radical species responsible for the photocatalytic activity were the superoxide anion radical (O2 •−) and holes (h+) after performing multiple scavenging tests.
机译：以尿素和甘蔗汁为原料，通过水热法成功地合成了碳点（CDs）和石墨氮化碳（g-C3N4）复合物（CD / g-C3N4）。使用各种光谱技术以及透射电子显微镜对复合材料和CD的化学组成，形态结构和光学性质进行了表征。 X射线光电子能谱（XPS）结果表明，来自CD / g-C3N4复合材料中CD的羰基和羧基的新信号，而X射线衍射（XRD）结果表明，将CD掺入g-C3N4后主体基质发生变形。 。两项分析均表明g-C3N4与CD之间存在相互作用。光致发光（PL）分析表明，太多CD的存在会在CD / g-C3N4界面上形成陷阱态，从而降低电子（e -）的传输。但是，具有最高CD覆盖率的CD / g-C3N4（0.5）复合材料仍然达到了最佳的双酚A（BPA）降解速率，是g-C3N4的3.87倍。因此，电荷分离效率不应成为引起CD / g-C 3 N 4 的光催化活性增强的主要因素之一。相反，光吸收能力是主要因素，因为光反应性与紫外可见漫反射光谱（UV-vis DRS）的结果相关性很好。尽管CD没有显示上转换光致发光（UCPL）特性，但是π共轭CD可以作为光敏剂（像有机染料一样）来敏化gC 3 N 4 和注入的电子gC 3 N 4 的导带（CB），导致吸收光谱从可见光到近红外（NIR）区域扩展。这种扩展的光谱吸收允许产生更多的电子，以增强BPA的降解。已确定，负责光催化活性的反应性自由基是超氧阴离子自由基（O 2 •-）和空穴（h + ）执行多个清除测试后。

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