标题： 燃煤电厂燃煤尘中碳点的形成机制和荧光特性 显示英文标题

标题： Formation mechanisms and fluorescence properties of carbon dots in coal burning dust from coal fired power plants

摘要： 碳点（CDs）因其独特的优异性能而显示出巨大的应用潜力。 煤及其衍生物富含芳环结构，适合用于制备具有微结构的CDs。 燃煤电厂的飞灰可作为一种丰富的资源来分离和提取CDs。 我们的结果显示，煤燃烧飞灰中形成CDs主要有两种可能机制。 一种是煤中含有的多环芳烃或煤不完全燃烧产生的多环芳烃的自组装。 另一种机制是煤中连接不同芳环结构的桥键断裂，在高温下燃烧时会形成带有不同功能基团的CDs。 在310-340 nm紫光激发或610-640 nm红光激发下，从煤燃烧飞灰中提取的CDs可以在约410 nm处发射紫光荧光。 CDs的上转换荧光发射机制是由于双光子吸收过程。 从燃煤电厂回收煤燃烧飞灰中的CDs不仅有助于环境保护，也有助于CDs的大规模生产。 显示英文摘要

摘要： Carbon dots (CDs) shows great application potential with their unique and excellent performances. Coal and its derivatives are rich in aromatic ring structure, which is suitable for preparing CDs in microstructure. Coal burning dust from coal-fired power plants can be utilized as a rich resource to separate and extract CDs. It has been shown in our results that there have two main possible mechanisms for the formation of CDs in coal burning dust. One is the self-assembly of polycyclic aromatic hydrocarbons contained in coal or produced by incomplete combustion of coal. The other mechanism is that the bridge bonds linking different aromatic structures in coal are breaking which would form CDs with different functional groups when the coals are burning at high temperature. Under violet light excitation at 310-340 nm or red light at 610-640 nm, CDs extracted from coal burning dust can emit purple fluorescence around 410 nm. The mechanism of up-conversion fluorescence emission of CDs is due to a two-photon absorption process. The recycling of CDs from coal burning dust from coal-fired power plants are not only good to protect environment but also would be helpful for mass production of CDs.