Journal of Textile Research ›› 2024, Vol. 45 ›› Issue (03): 11-18.doi: 10.13475/j.fzxb.20220906701

• Fiber Materials • Previous Articles     Next Articles

Preparation and performance of electrospun membrane for Cu(Ⅱ) detection

ZHAO Meiqi, CHEN Li(), QIAN Xian, LI Xiaona, DU Xun   

  1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
  • Received:2022-12-26 Revised:2023-03-31 Online:2024-03-15 Published:2024-04-15
  • Contact: CHEN Li E-mail:fychenli@163.com

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Abstract:

Objective Excessive Cu(Ⅱ) content may cause gastrointestinal disorders, liver and kidney damage, and even death. Therefore, the study of convenient Cu(Ⅱ) detection method is significant for maintaining human health. At present, the Cu(Ⅱ) detection is faced with problems of high detection cost, difficult on-site detection and pollution of detection probes. In order to solve the above problems, this study proposed a convenient Cu(Ⅱ) detection material for more intuitively detecting Cu(Ⅱ) content to avoid the inability so as to timely understand the Cu(Ⅱ) content of water that poses potential health risks.

Method In this study, the natural dye lac red (Lac) was used as the Cu(Ⅱ) detection probe, and polyacrylonitrile (PAN) and polyvinylpyrrolidone (PVP) were used as the carrier of the detection probe, and the Lac/PAN/PVP fiber membrane was prepared by electrospinning method. By means of rotational viscometer, scanning electron microscope, X-ray diffractometer and infrared spectrometer, the influences of spinning solution mass fraction and blending ratio on the structures and properties of fiber membranes were studied, and the Cu(Ⅱ) detection performance of fiber membrane was investigated.

Results When the mass fraction of PAN/PVP in spinning solution was increased from 7% to 19%, the corresponding viscosity was changed from 52.5 mPa·s to 4 316.7 mPa·s. When the mass fraction of PAN/PVP in the spinning solution was 7%, a lot of beads appeared on the surface of the fiber, and the fiber diameter was (102.3±1.8) nm. As the mass fraction of PAN/PVP in spinning solution was increased to 19%, the fiber formation tended to be uniform and smooth, and the fiber diameter increases to (546.3±7.4) nm. The fibers can be formed well at different mass ratios of PAN to PVP. The fiber diameter was decreased from (220.7±2.4) nm when the mass ratio of PAN to PVP was 5∶5 to (113.9±1.3) nm when the mass ratio of PAN and PVP was 9∶1. The water contact angle of the fiber membrane was decreased from 102.2° when the mass ratio of PAN to PVP was 10∶0 to 43.0° when the mass ratio of PAN to PVP was 5∶5. The addition of PVP improved the hydrophilicity of Lac/PAN/PVP fiber membrane. The infrared spectra showed that the absorption peak at 1 041 cm-1 was enhanced in the Lac/PAN/PVP fiber membrane, caused by the introduction of more hydroxyl groups on the lac red molecule to enhance the stretching of C—O in C—OH. It meant that lac red was successfully mixed into the fiber membrane. Two crystalline structures were found in the Lac /PAN/PVP fiber membrane. The Lac/PAN/PVP fiber membrane had no significant diffraction peaks at 2θ of 32°, 46° and 56°. It was found that the lac red was fully dissolved and evenly distributed in the fiber membrane by electrospinning. Only Cu(Ⅱ) can change the hue value of Lac/PAN/PVP fiber membrane from 338.0° to 22.3°, accompanied by a color response from red to yellow. It showed that the Lac/PAN/PVP fiber membrane has good anti-interference ability. The Lac/PAN/PVP fiber membrane hue value gradually changed from 349.9° red to 38.1° yellow. 0.03 mmol/L Cu(Ⅱ) solution was able to produce an obvious color response of Lac/PAN/PVP fiber membranes, and the color response intensity was increased with the Cu(Ⅱ) concentration from 0.03 mmol/L to 0.09 mmol/L.

Conclusion Lac/PAN/PVP fibers with a good morphology and a diameter of (149.7±0.7) nm were produced when the mass fraction of PAN/PVP was 10% and the mass ratio of PAN to PVP was 7∶3. The Lac/PAN/PVP fibers were able to specifically recognize Cu(Ⅱ) in solutions containing a variety of metal ions, producing a clear color response from red to yellow. Lac/PAN/PVP fiber membranes were capable of detecting Cu(Ⅱ) up to 0.03 mmol/L with the naked eye. The use of Lac/PAN/PVP fiber membranes for Cu(Ⅱ) detection enables the visualization of Cu(Ⅱ) detection and improves the convenience of Cu(Ⅱ) detection. Lac/PAN/PVP membranes have the advantages of good interference immunity and low detection limits, thus has potential applications in the field of Cu(Ⅱ) detection.

Key words: electrospinning, lac red, polyacrylonitrile, polyvinylpyrrolidone, copper ion detection, color response, fiber membrane

CLC Number: 

  • TS159

Fig.1

Viscosities of spinning solutions with different PAN/PVP mass fractions"

Fig.2

SEM images of Lac/PAN/PVP fiber membranes with different PAN/PVP mass fractions"

Fig.3

Diameter distribution of Lac/PAN/PVP fiber membranes with different PAN/PVP mass fractions"

Fig.4

SEM images of Lac/PAN/PVP fiber membranes with different PAN to PVP mass ratios"

Fig.5

Diameter distribution of Lac/PAN/PVP fiber membranes with different PAN to PVP mass ratios"

Fig.6

Contact angles of Lac/PAN/PVP fiber membranes with different PAN to PVP mass ratios"

Fig.7

FT-IR spectra of lac red and fiber membranes"

Fig.8

XRD patterns of lac red powder and fiber membranes with different components"

Tab.1

Hue values of Lac/PAN/PVP fiber membranes in different metal ion solutions"

金属离子溶液 色相值H/(°) 金属离子溶液 色相值H/(°)
原膜 338.0 Cu2+ 22.3
Li+ 336.7 Zn2+ 337.2
Na+ 336.4 Cd2+ 337.5
Mg2+ 336.5 Ba2+ 335.0
Al3+ 331.6 Pb2+ 336.4
K+ 339.0 Co2+ 339.6
Ca2+ 338.3 Ni2+ 340.4
Fe2+ 339.9 La3+ 336.6

Tab.2

Hue values of Lac/PAN/PVP fiber membrane in Cu2+ solution of different concentrations"

铜离子浓度/
(mmol·L-1)		 色相值
H/(°)		 铜离子浓度/
(mmol·L-1)		 色相值
H/(°)
0 349.9 0.05 32.4
0.01 0.3 0.06 32.9
0.02 0.1 0.07 36.2
0.03 16.2 0.08 36.3
0.04 23.3 0.09 38.1

Fig.9

Optical photographs of color changes of Lac/PAN/PVP fiber membrane in different solutions. (a) Color changes in different metal ion solutions; (b) Color changes in 0-0.09 mmol/L Cu2+ solution"

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