论文部分内容阅读
以新疆五彩湾煤炭为原料,通过混酸(H_2SO_4+HNO_3)/超声结合法制得煤基碳点(C-dots),对其结构进行了表征,考察了其作为荧光探针检测水体中金属离子的性能。结果表明,此煤基C-dots是一类具有sp~2碳构筑的多层石墨烯碎片结构环壁,且链接了硝基等含氧基团的稠环芳烃结构粒子,粒径为(8±4)nm,具有良好的吸收和荧光发射能力及水分散性;在痕量Cu~(2+)存在下,此C-dots能够选择性地发生荧光猝灭,对Cu~(2+)的检出限低至9.6 nmol/L,是一种极为有效的Cu~(2+)荧光检测剂。
The coal-based carbon dots (C-dots) were synthesized by mixed acid (H_2SO_4 + HNO_3) / ultrasound with Wucaiwan coal in Xinjiang as the raw material, and its structure was characterized. It was investigated as a fluorescent probe to detect metal ions in water performance. The results show that this coal-based C-dots is a kind of polycyclic aromatic hydrocarbon structural particles with multi-layer graphene fragment structure with sp ~ 2 carbon structure and linked with oxygen-containing groups such as nitro groups. The particle size is (8 ± 4) nm, and has good absorption and fluorescence emission ability and water dispersibility. In the presence of trace Cu 2+, this C-dots can selectively quench fluorescence, Detection limit as low as 9.6 nmol / L, is a very effective Cu ~ (2+) fluorescence detector.