title: Electrospun 1,4-DHAQ-doped cellulose nanofiber films for reusable fluorescence detection of trace Cu2+ and further for Cr3+.
abstract: 1,4-Dihydroxyanthraquinone (1,4-DHAQ, a fluorophore) doped cellulose (CL) (denoted as 1,4-DHAQ@CL) microporous nanofiber film has been achieved via simple electrospinning and subsequent deacetylating, and used for highly sensitive and selective fluorescence detection of Cu(2+) in aqueous solution. As the resultant byproduct of Cu(2+)-contaminated 1,4-DHAQ@CL nanofiber film showed recovered fluorescence by extra addition of Cr(3+) nitrate solution, 1,4-DHAQ and Cu(2+) codoped CL (denoted as (1,4-DHAQ)-Cu(2+)@CL)) microporous nanofiber film has been further fabricated for the detection of Cr(3+) in aqueous solution. It was found that the fluorescence intensity of the 1,4-DHAQ@CL microporous nanofiber film linearly decreases with Cu(2+) concentration ranging from 2.5 × 10(-9) to 3.75 × 10(-8) M, while that of the codoped (1,4-DHAQ)-Cu(2+)@CL nanofiber film linearly increases with Cr(3+) concentration from 2.5 × 10(-9) to 2.5 × 10(-8) M, both with high selectivity over many other common heavy metal ions. The sensing mechanism for Cu(2+) is ascribed to the formation of phenolate between 1,4-DHAQ and Cu(2+), while that for Cr(3+) is attributed to the reversing reaction from Cu(2+)-based phenolate to Cu(2+) and Cr(3+)-based excited complex with recovered fluorescence. The sensitive and selective detection of Cu(2+) and Cr(3+) by using the 1,4-DHAQ@CL and the (1,4-DHAQ)-Cu(2+)@CL nanofiber films was further demonstrated in polluted lake waters, thus indicating their potential applications in environmental monitoring of Cu(2+) and Cr(3+) in polluted water. Additionally, both the 1,4-DHAQ@CL and (1,4-DHAQ)-Cu(2+)@CL microporous nanofiber films are reusable for the detection of Cu(2+) and Cr(3+), respectively, after simple treatment. The design concept in this work might also open a door to the design of effective fluorescence probes for other heavy metal ions.
authors: Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China.
authors: Meiling
authors: M
authors: Wang
authors: Guowen
authors: G
authors: Meng
authors: Qing
authors: Q
authors: Huang
authors: Yiwu
authors: Y
authors: Qian
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry* / Q000648:ultrastructure; D002857:Chromium / Q000032:analysis*; D003116:Color; D003300:Copper / Q000032:analysis*; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D016062:Porosity; D059027:Recycling; D012996:Solutions; D013050:Spectrometry, Fluorescence; D014131:Trace Elements / Q000032:analysis*
chemical_list: D000880:Anthraquinones; D012996:Solutions; D014131:Trace Elements; D002857:Chromium; D003300:Copper; C034890:1,4-dihydroxyanthraquinone; D002482:Cellulose