121st General Meeting of the KCS

Type Poster Presentation
Area Medicinal Chemistry
Room No. Event Hall
Time 4월 19일 (목요일) 11:00~12:30
Code MEDI.P-581
Subject Ultra-rapid and selective detection of Cr(VI) ion using silicon quantum dots via fluorescence quenching mechanism
Authors Le Minh Tu Phan, Seung Hoon Back, kyoung yeol park, Tae Jung Park*
Department of Chemistry, Chung-Ang University, Korea
Abstract Chromium pollution, which is most commonly produced by industrial processes, has been a serious issue because of its toxic effects against the environment and human health. Among the oxidation states, hexavalent chromium Cr(VI) has been identified to be more hazardous due to its high solubility and carcinogenic activity at trace level. Consequently, a simple and rapid analytical system for Cr(VI) detection is highly essential to ensure water quality in terms of safeguarding human health. In this work, a facile one-step hydrothermal method to synthesize fluorescent silicon quantum dots (SiQDs) was developed and used as a probe for ultra-rapid detection of Cr(VI) in environmental water. The SiQDs were synthesized by employing 3-(2-aminoethylamino)propyltrimethoxysilane as a silicon source and ascorbic acid as a reduction agent. The as-prepared SiQDs were well dispersed in water and exhibited blue emission under UV-light irradiation. The resultant SiQDs acted as the fluorescent probe for selective determination of Cr(VI) with minimal volume of sample via fluorescence quenching mechanism. Moreover, this sensor eliminated the use of semiconductor quantum dots and other organic dyes, revealing that it utilized green chemistry approach. Most importantly, the promising practical application of synthesized SiQDs can rapidly discriminate Cr(VI) in water within 30 seconds with a sufficient detection limit as low as 0.65 µM. In summary, SiQDs can be used as good candidates in ultra-rapid sensing of Cr(VI) without any tedious sample preparation step.
E-mail minhtu.yddn@gmail.com