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CNTs-anchored Cellulose Fluorescent Nanofiber Membranes as Fluorescence Sensor for Cu2+ and Cr3+

Abstract

1,4-Dihydroxyanthraquinone (1,4-DHAQ, a fluorophore) doped carbon nanotubes@cellulose (1,4-DHAQ-doped CNTs@CL) nanofibrous membranes have been prepared via electrospining and subsequent deacetylating in this work. It has been successfully applied for highly sensitive detection of Cu2+ in aqueous solution. The surface area per unit mass (S/M) ratio of the nanofibrous membrane was enhanced by incorporating the CNTs into cellulose. Moreover, the excellent metal ions sorption capability of CNTs improved the sensitivity of the sensing materials. Both of the two points mentioned above significantly improved the lower detection limit of fluorescence sensing as expected. As the resultant byproduct of Cu2+-contaminated 1,4-DHAQ-doped CNTs@CL nanofibrous membranes showing recovered fluorescence by extra addition of Cr3+ in solution, 1,4-DHAQ and Cu2+ co-doped CNTs@CL (denoted as 1,4-DHAQ/Cu2+ co-doped CNTs@CL) mircoporous nanofibrous membranes have been further fabricated for fluorescence enhancement detection of Cr3+ in aqueous solution. It was found that the fluorescence intensity of the 1,4-DHAQ-doped CNTs@CL nanofibrous membranes linearly decreased with Cu2+ concentration in the range of 0―2.2×10―8 M, while that of the 1,4-DHAQ/Cu2+ co-doped CNTs@CL nanofibrous membranes linearly increased with Cr3+ concentration in the range of 0―2.4×10―8 M. The excellent fluorescence sensing property of the 1,4-DHAQ-doped CNTs@CL and 1,4-DHAQ/Cu2+ co-doped CNTs@CL nanofibrous membranes for Cu2+ and Cr3+ were further demonstrated by using polluted lake waters, proving their potential applications in environmental monitoring areas. The design concept mentioned in this work might also open a door to the design of other effective fluorescence probes with high sensitivity.

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Supplementary files

Publication details

The article was received on 22 Aug 2017, accepted on 29 Sep 2017 and first published on 29 Sep 2017


Article type: Paper
DOI: 10.1039/C7AY01994G
Citation: Anal. Methods, 2017, Accepted Manuscript
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    CNTs-anchored Cellulose Fluorescent Nanofiber Membranes as Fluorescence Sensor for Cu2+ and Cr3+

    Y. Gu, M. Wang and G. LI, Anal. Methods, 2017, Accepted Manuscript , DOI: 10.1039/C7AY01994G

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