1, 2-dithioglycol functionalised carbon nitride quantum dots as a "turn – off" fluorescent sensor for mercury ion detection. Issue 8 (21st June 2019)

• Record Type: Journal Article
• Authors: Wang, Jun; Cao, Yu; Wang, Chengyin; Chong, Hui; Wang, Guoxiu
• Is Part Of: International journal of environmental analytical chemistry. Volume 99:Issue 8(2019)
• Page Start: 796
• Page End: 807
• Publication Date: 2019-06-21
• Subjects: DTG-CNQDs -- surface functionalisation -- fluorescent probe -- mercury ion; Ecology -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental chemistry -- Periodicals; Pollution -- Periodicals; 577.14
• DOI: 10.1080/03067319.2019.1611800
• Languages: English
• ISSNs: 0306-7319

Abstract

ABSTRACT: A kind of 1, 2-dithioglycol (DTG) functionalised carbon nitride quantum dots (DTG-CNQDs) was designed for the first time by modifying DTG on the surface of carbon nitride quantum dots (CNQDs). The as-prepared DTG-CNQDs exhibit strong blue fluorescence under ultraviolet light and have a high quantum yield of 27%. Experiments show that Hg 2+ has a good quenching effect on the fluorescence of DTG-CNQDs. In phosphate buffer (PBS, 10 mM, pH 6.0), the fluorescence quenching rate (F0 /F) has a good linear relationship with the concentration of Hg 2+ in the range of 0.020–0.50 μM with detection limit of 0.63 nM. This fluorescent probe possesses high sensitivity and good selectivity, which can be applied in the rapid detection of Hg 2+ in tap and lake water samples.