Issue 38, 2019

Environmentally friendly synthesis of photoluminescent biochar dots from waste soy residues for rapid monitoring of potentially toxic elements

Abstract

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 Hg2+ and Fe3+ ions was further demonstrated with good linear relationships at 0–50 μM and 10–50 μM, respectively. The minimum detection limits of Hg2+ and Fe3+ were 100 nM and 30 nM. Furthermore, the feasibility of using the BCDs for monitoring of Hg2+ and Fe3+ in open waters was also established.

Graphical abstract: Environmentally friendly synthesis of photoluminescent biochar dots from waste soy residues for rapid monitoring of potentially toxic elements

Article information

Article type
Paper
Submitted
23 Apr 2019
Accepted
04 Jul 2019
First published
12 Jul 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 21653-21659

Environmentally friendly synthesis of photoluminescent biochar dots from waste soy residues for rapid monitoring of potentially toxic elements

L. Zhang, W. Liu, H. Zhuang, J. Zhang, C. Chen, Y. Wang and S. Shan, RSC Adv., 2019, 9, 21653 DOI: 10.1039/C9RA03001H

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