以绿萝为原料,通过水热法合成了蓝色荧光碳量子点(CQDs),考察了原料质量浓度、水热温度、CQDs浓度对CQDs荧光强度的影响,确定了最佳工艺条件:原料质量浓度3.3g/L、反应温度260℃、反应时间4h,此条件下制备的CQDs荧光强度最高。同时研究了盐离子浓度、紫外灯光照射时间、溶液pH对CQDs荧光强度的影响,结果表明CQDs有较好的盐稳定性和光稳定性,对pH有一定的依赖性,酸性条件下CQDs荧光强度相对较高。傅里叶变换红外光谱、X射线光电子能谱分析表明CQDs表面含有羟基、羧基等官能团,在水中有良好的溶解性。Fe3+对CQDs的荧光有明显的猝灭作用,其他金属离子对其干扰性小,基于荧光强度与Fe3+浓度之间的线性关系,CQDs能快速地检测水溶液中Fe3+浓度,最低检测限为0.77μmol/L。
Blue fluorescent carbon quantum dots (CQDs) were prepared from scindapsus aureus by hydrothermal method.The effects of raw material concentration,hydrothermal temperature and the concentration of CQDs on the fluorescence intensity of CQDs were explored.The optimum process conditions were determined as follows:raw material concentration of 3.3g/L,hydrothermal temperature of 260℃,and reaction time of 4h,resulting in the highest fluorescence intensity of the prepared fluorescent CQDs.Simultaneously,the effects of salt ion concentration,UV light irradiation time and aqueous pH on the fluorescence intensity of CQDs were also studied.The results showed that CQDs had good salt stability and photostability,but had a certain dependence on pH,and the fluorescence intensity of CQDs was relatively high under acidic conditions.The FT-IR and XPS spectra revealed that the surface of CQDs contained hydroxyl and carboxyl groups on the surface,and had good solubility in water.Fe3+ exhibited a significant quenching effect on the fluorescence of CQDs,while other metal ions had little interference.Based on the linear relationship between fluorescence intensity and concentration of Fe3+ ions,the prepared CQDs could quickly detect the concentration of Fe3+ in aqueous solution,with a minimum detection limit of 0.77μmol/L.
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基金资助
国家自然科学基金重大项目(52090033;52090030)
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