【作者】 陆跃翔； 王哲； 魏国玉； 陈靖；

【Author】 Yuexiang Lu;Zhe Wang;Guoyu Wei;Jing Chen;Institute of Nuclear and New Energy Technology, Tsinghua University;

【机构】 清华大学；

【摘要】 直流常压微等离子体同时具有电化学和等离子体的双重性质,为材料合成提供了一种新型的温和的制备方法。本文用等离子体方法简单、快速制备了具有荧光性质的碳点/介孔二氧化硅（CDs/SBA-NH₂）复合材料。复合材料同时保留了碳点的荧光性质和介孔二氧化硅的介孔结构等性质。将此复合材料应用于铀的吸附,发现在pH为3-6条件下碳点的负载显著增加了介孔硅的吸附容量,并且复合材料的荧光强度随铀吸附量的增加而减小,实现了对铀的吸附行为的实时监测。此外,复合材料对铀具有很好的吸附选择性,且与纯碳点对铀的荧光选择性一致。可根据这一性质快速筛选制备含有碳点的复合材料用于选择性吸附相应的金属离子。本文发展一种基于等离子体电化学制备碳点及其复合材料的方法,提出了用荧光性质实时监测吸附过程的新理念,拓宽了等离子体和碳点复合材料的应用范围及前景。更多还原

【Abstract】 Carbon dots（CDs） were prepared in situ and introduced onto amino-functionalized ordered mesoporous silica（SBA-NH₂） by a facile microplasma method. Compared with bare SBA-NH₂, the CDs/SBA-NH₂ composites showed much improved adsorption ability and excellent selectivity for uranyl ions. Moreover, the fluorescence intensity of the composites decreased along with the increase of uranium uptake, indicating that the CDs/SBA-NH₂ could be used for onsite monitoring of the adsorption behavior. More interestingly, the adsorption selectivity of the composites for metal ions was in good agreement with the selective fluorescence response of the original CDs, which means the adsorption selectivity of CDs based composite materials can be predicted by evaluating the fluorescence selectivity of the CDs for metal ions. As the first study of CDs-based nanocomposites for the adsorption of actinide elements, this work opens a new avenue for the in situ monitoring of adsorption behavior of CDs-based nanocomposites while extending their application areas.更多还原