利用反应釜制备碳量子点并通过氨水和乙二胺使其表面氨基化,在水热反应条件下制备二氧化钛,然后将氨基化碳量子点与二氧化钛复合得到复合催化剂。氨基化碳量子点荧光强度增强；复合催化剂的荧光猝灭,可见光区吸收增强。在可见光的照射下单独的量子点和二氧化钛没有明显的催化作用,而复合催化剂加快了亚甲基蓝的降解。氨水修饰的碳量子点与二氧化钛复合能够在15 min内降解完亚甲基蓝,乙二胺修饰的碳量子点与二氧化钛复合只需要10 min,由此可见氨基化量子点与二氧化钛复合能够促进对可见光的利用。
Carbon quantum dots (CQDs)and their surface amine modification were prepared in a autoclave,and TiO2 was produced in the hydrothermal conditions,then CQDs was incorporated intoTiO2 .Fluorescence intensi-ty of amino-functional CQDs was higher than original CQDs,while the fluorescence of composite catalysts was quenched under the same conditions,and absorption capacity was strengthened in visible solar wavelength range.Photocatalytic property of single CQDs and TiO2 were both weak,composite catalysts can accelerate the degradation of methylene blue (MB).Ammonia-capped CQDs and TiO2 composite catalyst can degrade MB completely in 15 minutes,and ethylenediamine-capped CQDs and TiO2 composite catalyst only need 10 minutes. This showed that the availability of visible light increased.
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