Jiaxing University

Replacing artificial fibers with natural fibers to fabricate fiber-reinforced resin matrix composites is a research hotspot at present. How to improve the poor compatibility between plant fiber and resin matrix is hot spots in this area. Our work is aim to modify RFF reinforced epoxy resin (RFF/EP) composite laminates with silicon polymer (PSOL) and improve the performance of the composite laminates. The results indicate that the interfacial adhesion between EP and RFF was effectively improved after PSOL modification, which enhance the mech. properties (including interlaminar shear strength, flexural strength and tensile strength) of the PSOL/RFF/EP composite laminates. And the thermal stability of the modified composite laminates is maintained as the RFF/EP composite laminate. This method further expands the potential application for natural fibers to replace artificial fibers.

The upgraded poly(ethylene terephthalate) (PET) glycolysis catalyzed by Zinc-doped magnetic ferrite nanoparticles (Zn-MNPs) was applied in recycling of PET textiles colored by different disperse dyes. As bi-functional catalysts, Zn-MNPs acted as Lewis acid in PET glycolysis and dispersion electrodes in dye decolorization. The decomposition of dyes kept pace with PET glycolysis in the presence of Zn-MNPs because of the cleavage of azo chromophores in azo dyes and the loss of substituent groups in anthraquinone dyes, resulting in color removal rates of 71.91% and 54.85%, resp. In order to improve the recyclability of excessive ethylene glycol (EG) in glycolysis liquid (GL), electro-Fenton process was further applied to eliminate the benzene ring and stubborn additives in residual dyes. The decolorization rate of both azo and anthraquinone dyes can be increased to more than 97.54% in 2 h, with 2.6 vt% of H₂O₂ concentration, 0.35 wt% of Zn-MNPs dosage, and 0.19 A/cm² of c.d. The discolored GL can be purified by rectification to recover EG and reused in PET glycolysis. The results reveal that simultaneously PET degradation and decolorization can be realized through the upgraded glycolysis combined with electro-Fenton process catalyzed by Zn-MNPs.

In this work, sulfhydryl functionalized carbon dots (SH-CDs) were synthesized for the first time by a two-step hydrothermal method. The sulfhydryl group in SH-CDs can be converted efficiently and reversibly in a few minutes under redox conditions. On this basis, ochratoxin A (OTA) induced hybrid chain reaction amplification and alk. phosphatase enzymic hydrolysis to produce ascorbic acid (AA). AA reduced the aggregated SH-CDs, thereby realizing the dual-mode rapid quant. anal. of the OTA concentration by measuring the changes in the fluorescence intensity and absorbance of the SH-CDs solution The proposed sensor has a good linear relationship with the OTA concentration in the range of 2.0-5.0 nM, and the lowest detection limit is 2.0 nM. Addnl., the visual color change of the solution can improve the simplicity and accuracy of semi-quant. detection of OTA with the naked eye. In short, this method has the advantages of rapidity, sensitivity, reversibility and visualization.