화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.84, 375-383, April, 2020
DOI10.1016/j.jiec.2020.01.021  Export Citation
Highly fluorescent silicon quantum dots decorated silica microspheres for selective detection and removal of Au3+ and subsequent catalytic application
Lu-Shuang Li1, 2, and Li Xu1, †
  • 1Tongji School of Pharmacy, Huazhong University of Science and Technology, Wuhan 430030, China
  • 2Key Laboratory of Tropical Biological Resources of Ministry of Education, School of Life and Pharmaceutical Sciences, Hainan University, Haikou 570228, China
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Sensitive detection and efficient removal of Au3+ are important for environmental monitoring and remediation. In this study, silicon quantum dots (SiQDs) were prepared with 3-aminopropyl trimethoxysilane as the silicon source and boric acid as the doping substance to enhance fluorescence quantum yield. The obtained SiQDs possessed fluorescence sensing ability of Au3+ and were successfully decorated on the mesoporous silica microspheres (SiO2), giving SiO2-SiQDs. Owing to the high affinity for Au3+ and the relatively large surface area, the SiO2-SiQDs exhibited not only selective fluorescence detection of Au3+ in water matrix with a relatively low limit of detection (13.67 μg L-1), but also efficient adsorption of Au3+ with a maximal adsorption capacity of 530.7 mg g-1. Besides, the Au3+ adsorbed on the SiO2-SiQDs could be in-situ reduced into evenly dispersed small-size gold nanoparticles, showing high catalytic efficiency for the reduction of 4-nitrophenol. The remarkable performance of SiO2-SiQDs on detection, adsorption and reusability demonstrated its multi-purposed applicabilities.
Keywords:Silicon quantum dots;Au3+;Fluorescence sensor;Adsorption;Catalysis
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