碳量子点修饰石墨相氮化碳光催化降解罗丹明B的研究

刘帅; 李学雷; 王烁天; 王彦娟; 苑兴洲; 张健; 梁飞雪; 胡绍争

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中国环境科学 ›› 2020, Vol. 40 ›› Issue (7) : 2909-2916.

水污染与控制

碳量子点修饰石墨相氮化碳光催化降解罗丹明B的研究

刘帅¹, 李学雷², 王烁天¹, 王彦娟¹, 苑兴洲¹, 张健¹, 梁飞雪¹, 胡绍争¹

作者信息 +

Photocatalytic degradation of rhodamine B by carbon quantum dot modified graphite phase carbon nitride

LIU Shuai¹, LI Xue-lei², WANG Shuo-tian¹, WANG Yan-juan¹, YUAN Xing-zhou¹, ZHANG Jian¹, LIANG Fei-xue¹, HU Shao-zheng¹

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摘要

利用抗坏血酸（AA）对石墨相氮化碳（g-C₃N₄）进行改性，制备出表面含有碳量子点（CQDs）的催化剂CQDs/g-C₃N₄.通过X射线衍射（XRD）、紫外可见光漫反射（UV-Vis DRS）、透射电镜（TEM）、光致发光光谱（PL）、X射线光电子能谱（XPS）对催化剂进行结构、形貌、光学性能测试.发现CQDs很好的负载到了g-C₃N₄表面，增加了催化剂表面活性位点.UV-Vis DRS表明碳量子点能够使催化剂的吸收光谱发生红移，同时缩小了催化剂的带隙宽度，增强了对光的吸收能力.光致发光光谱则显示了碳量子点的修饰能够有效的抑制光生电子空穴对的复合，从而提高光催化性能.通过光降解实验表明0.01g CQDs/g-C₃N₄催化剂在80℃下，3h对罗丹明B（RhB）的降解率为57.2%.捕获剂实验则说明了超氧自由基（·O₂^-）在光降解体系中起到了促进反应速率的作用.

Abstract

In this study, CQDs/g-C₃N₄ was prepared by using ascorbic acid and urea as precursors. The characterizations of CQDs/g-C₃N₄ were carried out by X-ray diffraction (XRD), ultraviolet visible light diffuse reflection (UV-vis), transmission electron microscopy (TEM), fluorescence spectrum (PL), X-ray photoelectron spectroscopy (XPS). The results showed that carbon quantum dots were well loaded onto the surface of graphite phase carbon nitride bringring about the active sites of g-C₃N₄ increase. The CQDs modification could effectively improve the visible light absorbance of g-C₃N₄, as well as decrease its band gap. At the same time, the addition of carbon quantum dots could inhibit the recombination of photogenerated electron-hole pair in catalyst. Under simulated light irradiation, the RhB photodegradation ability of CQDs/g-C₃N₄ was significantly higher than that of single g-C₃N₄. 56.7% of RhB could be degraded over 0.01g of CQDs/g-C₃N₄ at 80℃ in 3h. Capture agent experiment result showed that superoxide radical played a major role in the photodegradation reaction system.

导出引用

刘帅, 李学雷, 王烁天, 王彦娟, 苑兴洲, 张健, 梁飞雪, 胡绍争. 碳量子点修饰石墨相氮化碳光催化降解罗丹明B的研究[J]. 中国环境科学. 2020, 40(7): 2909-2916

LIU Shuai, LI Xue-lei, WANG Shuo-tian, WANG Yan-juan, YUAN Xing-zhou, ZHANG Jian, LIANG Fei-xue, HU Shao-zheng. Photocatalytic degradation of rhodamine B by carbon quantum dot modified graphite phase carbon nitride[J]. China Environmental Science. 2020, 40(7): 2909-2916

中图分类号： X703.1

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