Search

Polyester fibers have been applied in many industrial fields, such as plastic furniture, automotive parts, medical devices, and liquid crystal displays. However, polyester has been inherently resistant to dyeing owing to the absence of active staining sites. Herein, we present the preparation of new photoluminescent fibers starting from recycled polyester waste using plasma-assisted dyeing with the recyclable lanthanide-doped strontium aluminate nanoparticles. Nanostructured thin film of lanthanide-doped strontium aluminate nanoscale particles (3–8 nm) was immobilized onto polyester surface after plasma pretreatment, which generates reactive dyeing spots on the fibrous surface. Using photoluminescence spectra and CIE (Commission Internationale de L'éclairage) Lab parameters, the photoluminescent polyester fibers displayed various colors, including white in visible light and green under ultraviolet rays. After excitation at 382 nm, the photoluminescent thin layer on the fiber surface exhibited an emission peak of 439 nm. Various methods were utilized to inspect the morphology and elemental contents of the polyester fibers immobilized with phosphor nanoparticles. The superhydrophobicity of the phosphor-dyed polyester fibers was found to increase in direct proportion to the phosphor content, displaying improved sliding and static contact angles up to 155.8° and 8°, respectively. The results demonstrated that the dyed fibers had improved colorfastness, ultraviolet (UV) shielding, superhydrophobicity and antimicrobial activity. Both bending-length and air-permeability of dyed polyester fibers was evaluated to indicate good mechanical and comfort properties.

Tetracycline antibiotic has been widely used in veterinary and aquafarming medicines to prevent and treat infectious diseases. However, the overall use of tetracycline results in its accumulation in the organism organs, which then migrates to food and eventually increases the risk of developing various diseases. As one of the most well-known contaminants, sugarcane bagasse (SCB) agricultural waste has been a serious problem worldwide. In order to develop luminous carbon dots doped with nitrogen (NCDs), a simple and environmentally friendly approach was devised to reprocess sugarcane bagasse agricultural waste. A passivating agent, ammonium hydroxide (NH4OH), was used during the hydrothermal carbonization of NCDs in a single-pot procedure. Carbon dots nanoparticles (5–8 nm) embedded in cellulose paper assay were used to prepare the testing strip. With an emission wavelength of 447 nm upon excitation at 355 nm and, NCDs displayed a quantum yield (QY) of up to 24.81%. As a result of the inner filter effect (IFE), the fluorescence of NCDs was clearly quenched by tetracycline, demonstrating their exceptional tetracycline selectivity. The detection limit was set in the concentration range of 0–110 μM. Tetracycline is detected and measured using the current cellulose paper strip, which contains a fluorescent signal that could be turned off to eliminate the signal. The fluorescence quenching feature of cellulose carbon dots in the existence of tetracycline affects the fluorescence activity of the paper strip assay.

Adsorption of dyes on solid surfaces has been given considerable interest as one of the most efficient water treatment procedures owing to their low cost, simplicity, recyclability and adsorption efficiency. In this contribution, we report a simplified synthetic route of a novel bipyridinium-based viologen polymer from the polymerization of a viologen-based dialdehyde with aryl-based dihydrazide in an acidic aqueous solution. The developed polyviologen was exposed to the simple freeze-drying process to introduce the corresponding fibrous-like aerogel with high surface area. The chemical structure of the acylhydrazone-based viologen polymer (AHVP) was fully characterized using different spectroscopic techniques. AHVP displayed excellent affinity to form assembled hydrogel. Interestingly, the produced polymers introduced AHVP-linked covalent organic hydrogel framework that is organized in the form of nanofibers. Due to large surface area and surface functionalization, the ability of the active freeze-dried AHVP to adsorb Reactive Blue 19 (RB19) from an aqueous solution worth to be examined. Fourier-transform infrared (FTIR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), scanning electron microscope (SEM), and UV–Vis absorption spectra were utilized to examine the aerogel surface morphology of the three-dimensional metal–organic viologen framework before and after adsorption of Reactive Blue 19.

Novel organogelators based on fluorescent alkoxy-substituted 1,4-diarylated 1, 2, 3-triazoles are reported. The findings monitored in the current study promoted the development of inventive compacted supramolecular architectures generated by self-assembly of the prepared triazole-based organogelators. The synthesis, characterization and gelation properties of the current novel alkoxy-substituted 1,4-diarylated 1, 2, 3-triazole arms were described. The synthesis procedures were accomplished by using Cu-catalyzed azide-alkyne cycloaddition (CuAAC) of alkoxy-substituted aryl azide with aryl bearing terminal alkyne subtituents and alkoxy chains of different lengths. The alkoxy-substituted of 1, 4-diarylated 1, 2, 3-triazole derivatives bearing different alkoxy chains were characterized by FTIR, 1H/13C NMR, and elemental analysis. The 1, 4-diarylated 1, 2, 3-triazoles with longer alkoxy terminal groups demonstrated improved gelation properties compared to those with shorter alkoxy terminals. The morphologies of the self-assembled alkoxy-substituted 1, 4-diarylated 1, 2, 3-triazoles were investigated using scanning electron microscopy (SEM), which demonstrated arrangements of highly ordered nanofibers, forced by π-stacks and van der Waals interactions. The antibacterial activity and cytotoxicity of the newly synthesized triazoles was investigated to verify the potential use of the present triazole gelators for a variety of applications, such as drug delivery.