当前位置: X-MOL 学术J. Ind. Eng. Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Highly fluorescent silicon quantum dots decorated silica microspheres for selective detection and removal of Au3+ and subsequent catalytic application
Journal of Industrial and Engineering Chemistry ( IF 5.9 ) Pub Date : 2020-04-01 , DOI: 10.1016/j.jiec.2020.01.021
Lu-Shuang Li , Li Xu

Abstract 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.

中文翻译:

高荧光硅量子点装饰二氧化硅微球,用于选择性检测和去除 Au3+ 以及随后的催化应用

摘要 灵敏检测和有效去除 Au3+ 对环境监测和修复具有重要意义。本研究以3-氨基丙基三甲氧基硅烷为硅源,硼酸为掺杂物质,制备了硅量子点(SiQDs),以提高荧光量子产率。获得的 SiQDs 具有 Au3+ 的荧光传感能力,并成功地装饰在介孔二氧化硅微球 (SiO2) 上,得到 SiO2-SiQDs。由于对 Au3+ 的高亲和力和相对较大的表面积,SiO2-SiQDs 不仅表现出对水基质中 Au3+ 的选择性荧光检测,检测限相对较低(13.67 μg L-1),而且对 Au3+ 具有高效吸附最大吸附容量为 530.7 mg g-1。除了,吸附在SiO2-SiQDs上的Au3+可以原位还原成均匀分散的小尺寸金纳米粒子,对4-硝基苯酚的还原具有很高的催化效率。SiO2-SiQDs 在检测、吸附和可重复使用方面的卓越性能证明了其多用途的适用性。
更新日期:2020-04-01
down
wechat
bug