Zhang Liting, Liu Wanpeng, Zhuang Haifeng, Zhang Jin, Chen Chao, Wang Yibing, Shan Shengdao
Zhejiang Province Key Laboratory of Recycling and Eco-treatment of Waste Biomass, Zhejiang University of Science and Technology Hangzhou 310023 China
State Key Laboratory of Bioreactor Engineering, Biomedical Nanotechnology Center, School of Biotechnology, East China University of Science and Technology Shanghai 200237 China.
RSC Adv. 2019 Jul 12;9(38):21653-21659. doi: 10.1039/c9ra03001h. eCollection 2019 Jul 11.
Single-step environmentally friendly synthesis of biochar dots (BCDs) was developed using hydrothermal treatment of waste biomass. Using soy residue as the carbon precursor, the resultant BCDs had strong and stable photoluminescence. Characterization by atomic force microscopy (AFM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy indicates that the BCDs prepared were water soluble, spherical, oxygenous and nitrogen-doped carbon nanoparticles with 10-20 nm in diameter. The fluorescence quantum yield of the BCDs was 3.7%. The use of the BCDs as a very effective fluorescent probe for label-free, rapid, and selective detection of Hg and Fe ions was further demonstrated with good linear relationships at 0-50 μM and 10-50 μM, respectively. The minimum detection limits of Hg and Fe were 100 nM and 30 nM. Furthermore, the feasibility of using the BCDs for monitoring of Hg and Fe in open waters was also established.
采用废弃生物质水热法一步合成了生物炭量子点（BCD）。以豆渣为碳前驱体，所得BCD具有强且稳定的光致发光性能。通过原子力显微镜（AFM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）和红外光谱表征表明，制备的BCD是直径为10 - 20 nm的水溶性、球形、含氧且氮掺杂的碳纳米颗粒。BCD的荧光量子产率为3.7%。进一步证明了BCD作为一种非常有效的荧光探针用于无标记、快速且选择性地检测Hg和Fe离子，在0 - 50 μM和10 - 50 μM范围内分别具有良好的线性关系。Hg和Fe的最低检测限分别为100 nM和30 nM。此外，还证实了使用BCD监测开放水域中Hg和Fe的可行性。
