化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (5) : 198-202.

科学研究

碳点/TiO₂的制备及对亚甲基蓝的光催化性能

作者信息 +

Preparation of CQDs/TiO₂ and its photocatalytic activity for methylene blue

Li Shengying, Chen Huiwen, Su Hui, Su Zhiheng, Feng Jianhai

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Received
2018-05-15
Issue Date	Revised Date
2019-06-17	2018-05-15

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摘要

碱性条件下以葡萄糖为碳量子碳源,水热法制备碳量子点,碳点与TiO₂通过冷凝回流制备TiO₂复合材料(CQDs/TiO₂),通过分子荧光、扫描电镜等手段对碳点溶液和材料进行表征,并研究CQDs/TiO₂在紫外灯、白炽灯下不同时间、pH下对亚甲基蓝的吸附降解性能及循环性能。结果表明:通过分子荧光成功制备了碳点溶液;CQDs/TiO₂虽然在扫描电镜和X射线衍射中的形貌和结构与纯TiO₂并无明显差异,但其在红外谱图(1090和2354cm^-1)和热重(400～600℃)与纯TiO₂相比均有差异,在一定程度上证明了碳点成分的存在;固体紫外漫反射结果显示在200～800nm波长下CQDs/TiO₂材料对光的吸收都强于TiO₂;CQDs/TiO₂在同种光源下对亚甲基蓝溶液的降解率都比纯TiO₂的高,且白炽灯效果要优于紫外灯;材料对亚甲基蓝的降解率都随pH的增加而提高;CQDs/TiO₂在白炽灯下的循环性能较好。

Abstract

Carbon dots (CQDs)/TiO₂ composites were prepared by condensation reflux with TiO₂ and carbon quantum dots (CQDs) which were prepared by hydrothermal method at alkaline conditions,using glucose as carbon quantum dots' source.The carbon dots' solution and materials were characterized by molecular fluorescence and scanning electron microscopy.The adsorption and degradation of methylene blue by CQDs/TiO₂ at different pH,different time under ultraviolet lamp and white lamp were studied.The results showed that there was no significant difference between the morphology and structure of CQDs/TiO₂ in SEM and XRD,but the difference between CQDs/TiO₂ and pure TiO₂ in infrared spectra (1090cm^-1 and 2354cm^-1) and thermogravimetry (400～600℃) showed the existence of carbon dots components.The results of solid UV diffuse reflection showed that the light absorption of CQDs/TiO₂ was stronger than that of TiO₂ at 200～800nm wavelength.The degradation rate of CQDs/TiO₂ to methylene blue solution at the same light source was higher than that of pure TiO₂,and the effect of white lamp was better than that of UV lamp,and the degradation rate of methylene blue increased with the increase of pH value,the cycle performance of CQDs/TiO₂ at white light was better.

关键词

TiO₂ / 碳量子点 / 光催化

Key words

TiO₂ / carbon quantum dot / photocatalysis

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碳点/TiO₂的制备及对亚甲基蓝的光催化性能[J]. 化工新型材料, 2019, 47(5): 198-202 DOI:

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