Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (05): 143-150.doi: 10.13475/j.fzxb.20240506101

• Fiber Materials • Previous Articles     Next Articles

Preparation of alizarin-polylactic acid/collagen nanofiber membrane and its ammonia detection performance

SHI Xiaocong, CHEN Li(), DU Xun   

  1. School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an, Shaanxi 710048, China
  • Received:2024-05-27 Revised:2025-01-23 Online:2025-05-15 Published:2025-06-18
  • Contact: CHEN Li E-mail:fychenli@163.com

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Abstract:

Objective Ammonia is a common toxic gas, widely existing in industrial, agriculture and living environment. Because of the strong corrosive and irritating nature of ammonia, it is a serious threat to human and animal life and health. Therefore, it is particularly important to develop a new type of testing material which is simple in operation, low in cost, and capable of achieving real-time non-destructive testing with visual characteristics.
Method An alizarin-PLA/Col nanofiber membrane was prepared by electrospinning using alizarin as probe and polylactic acid (PLA) and collagen (Col) as substrate. By means of UV-Vis spectrophotometer, scanning electron microscope, differential scanning calorimeter, X-ray diffractometer and contact angle measuring instrument, the color change of the probe and the micro-morphology and chemical composition of the nanofiber membrane were characterized, and the thermal stability, hydrophilicity, degradability, ammonia detection performance and repeatability of the nanofiber membrane were investigated.
Results Alizarin solution was adopted to produce different color changes under different pH conditions, and was used as a probe for ammonia detection. The addition of alizarin demonstrated no significant effect on the appearance of nanofibers, which have average diameter of about 190 nm, and are straight and evenly distributed in fineness. Infrared spectroscopy showed that compared with the PLA/Col nanofiber membrane, a new absorption peak appeared in the alizarin-PLA /Col nanofiber membrane at 896 cm-1 because of the addition of alizarin, proving the successful dopping of alizarin into the nanofiber membrane. According to thermal performance analysis, the melting temperature of alizarin-PLA/Col nanofiber membrane was 341.2 ℃, indicating that the nanofiber membrane has good thermal stability in normal temperature environment. XRD analysis of alizarin-PLA/Col nanofiber membrane showed that the characteristic peaks of alizarin molecules did not appear in the alizarin-PLA/Col nanofiber membrane, indicating either that alizarin was uniformly dispersed in the nanofiber membrane or that alizarin was fully dissolved in the spinning solution, resulting in the disappearance of the original crystallization of alizarin. After addition of alizarin, the contact angle of the nanofiber membrane in water did not change obviously, suggesting that the addition of alizarin did not affect the hydrophilic and hydrophobic properties of the nanofiber membrane. With the increase of ammonia concentration, the color of the nanofiber membrane changes from yellow to red and finally to purple. Alizarin PLA/Col nanofiber membrane demonstrated a good performance of repeated detection of ammonia gas and reusability. In practical applications, the color of alizarin PLA/Col nanofiber membrane for the detection of fish body would visually change with time, and this meets the requirement of detecting the freshness of fish body. The addition of Col improved the hydrophilicity of the nanofiber membrane. The nanofiber membrane is self-degradable and hence environmentally friendly.
Conclusion Alizarin can be used as a probe for the detection of ammonia, which is easily combined with water and is weakly alkaline. The color of alizarin solution changed from light yellow to pink when the pH value was 6-7. With the increase of pH value, the color of alizarin solution gradually deepened, from pink to purple. With the increase of ammonia concentration, the color of the alizarin-PLA/Col nanofiber membrane can be changed from yellow to pink to purple, and the detection performance is good. Alizarin-PLA/Col nanofiber membrane has good biodegradability and will not pollute the environment after waste.In practical application, nanofiber membrane can also meet the freshness detection of fish.

Key words: ammonia detection, electrospinning, alizarin, polylactic acid, collagen, detection probe, nanofiber membrane

CLC Number: 

  • TQ340.64

Fig.1

Preparation process of alizarin-PLA/Col nanofiber membrane"

Fig.2

UV-Vis absorption spectra of alizarin solution"

Fig.3

Appearance of alizarin-PLA/Col nanofiber membranes"

Fig.4

Diameter distribution of alizarin-PLA/Col nanofibers membranes"

Fig.5

Infrared spectra of alizarin-PLA/Col nanofiber membranes"

Fig.6

DSC patterns of alizarin-PLA/Col nanofiber membranes"

Fig.7

XRD patterns of alizarin-PLA/Col nanofiber membranes"

Fig.8

Contact angles of nanofiber membranes"

Tab.1

Color characteristic values of alizarin at different ammonia solution concentrations"

浓度/
(mol·L-1)		 L a b H/(°) ΔE
0 82.1 -2.0 17.0 51.0 0
0.004 81.2 2.4 14.6 38.7 5.09
0.008 77.4 2.6 11.7 35.1 8.45
0.040 76.4 11.0 7.0 8.0 17.36
0.080 76.8 14 -1.4 338.5 24.95
0.400 53.5 9.9 -3.9 323.8 37.37
0.800 52.4 10.0 -5.0 317.0 38.86
1.000 45.9 13.2 -16.0 274.0 51.29

Fig.9

Color change of alizarin-PLA/Col nanofiber membranes with different ammonia solution concentrations"

Fig.10

Repeatability detection of alizarin-PLA/Col nanofiber membrane"

Fig.11

Freshness detection of fish"

Fig.12

Color change mechanism of alizarin"

Fig.13

SEM images of PLA/Col nanofibre membrane soil landfill at different weeks(×60). (a) 1 week; (b) 2 weeks; (c) 3 weeks; (d) 4 weeks"

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