检出限
催化作用
化学
碳纳米管
X射线光电子能谱
激进的
水热碳化
二硫化钼
核化学
碳化
光化学
无机化学
纳米技术
化学工程
材料科学
有机化学
色谱法
吸附
工程类
作者
Luping Feng,Lixiang Zhang,Yushuang Gong,Zhongling Du,Xi Chen,Xiaoyu Qi,Xiaoqing Zhang,Guojiang Mao,Hua Wang
标识
DOI:10.1016/j.snb.2022.131725
摘要
C@MoS 2 nanocomposites with hollow nanotube structures were synthesized through the hydrothermal sulfuration of molybdenum precursor along with the carbonization of glucose. Interestingly, it was found that the so-obtained C@MoS 2 nanzymes could specifically exhibit much enhanced oxidase-like catalysis after the addition of Hg 2+ . Herein, carbon might not only play a role in accelerating charge transfer, but also conduct the synergistic effects with MoS 2 to provide more catalytic active sites of nanzymes as compared with pristine MoS 2 . Especially, the introduction of Hg 2+ could induce C@MoS 2 nanozyme to produce more quantities of highly oxidative superoxide radicals through the strong Hg-S chelation in the catalysis reactions, as confirmed by the electron spin-resonance spectroscopy, X-ray photoelectron spectroscopy, photoluminescence spectra, and radical capturing experiments. A catalysis-based colorimetric platform with C@MoS 2 nanozyme was thereby constructed for the quantitative analysis of Hg 2+ ions, showing linear responses to Hg 2+ in the range of 0.010–100 μM with the detection limit of 2.7 nM, which is lower than those of current analysis methods. More importantly, the proposed colorimetric assay could be applied for detecting Hg 2+ in environmental wastewater with the satisfactory detection recoveries, showing great potential applications for environmental monitoring, biomedical sensing, and food detection fields. • Hollow C@MoS 2 nanotubes with Hg 2+ -enhanced oxidase-like activity were synthesized. • Carbon might conduct the synergistic effects with MoS 2 yielding more active sites of C@MoS 2 . • Hg 2+ could endow C@MoS 2 nanozyme with more superoxide radicals by the Hg-S chelation. • An effective C@MoS 2 -based colorimetric assay is established for the analysis of Hg 2+ ions. • The developed strategy enables the evaluation of Hg 2+ ions in the wastewater.
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