To provide multifunctional polymer consumables for 4D printing and a new methodology for utilizing waste cooking oil (WCO), a type of photocurable resin based on WCO was synthesized. This WCO-based resin contained epoxy waste oil methacrylate, which is derived from WCO, along with 2phenoxyethyl acrylate (PHEA) and methacrylic acid (MAA) as monomers, which were obtained with a light-curing 3D printer. The 4D printing photocurable resin based on WCO comprised a polymeric network constructed by WCO, a polymeric PHEA segment, and a polymeric MAA segment. It displayed high flexibility (elongation at break: 230.1%), functional pressuresensitive adhesion properties (interfacial adhesion toughness: 72.6 J/m 2 on wood and 58.4 J/m 2 on steel), as well as good thermally induced shape memory performances (deforming and recovering at room temperature; fixing at −12 °C), which could be potentially used for generating products, including wearable devices, intelligent devices, biological supports, folding structures, as well as personalized products such as sticker signs, handmade toys, or ornaments.

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The development of a highly selective, simple, and rapid detection method for nitrofuran antibiotics (NFs) is of great significance for food safety, environmental protection, and human health. To meet these needs, in this work, cyan-color highly fluorescent N-doped graphene quantum dots (N-GQDs) were synthesized using cane molasses as the carbon source and ethylenediamine as the nitrogen source. The synthesized N-GQDs have an average particle size of 6 nm, a high fluorescence intensity with 9 times that of undoped GQDs, and a high quantum yield (24.4%) which is more than 6 times that of GQDs (3.9%). A fluorescence sensor based on N-GQDs for the detection of NFs was established. The sensor shows advantages of fast detection, high selectivity, and sensitivity. The limit of detection for furazolidone (FRZ) was 0.29 μM, the limit of quantification (LOQ) was 0.97 μM, and the detection range was 5−130 μM. The fluorescence quenching mechanism of the sensor was explored by fluorescence spectroscopy, UV−vis absorption spectroscopy, Stern−Volmer quenching constant, Zeta potential, UV−vis diffuse reflectance spectroscopy, and cyclic voltammetry. A fluorescence quenching mechanism of dynamic quenching synergized with photoinduced electron transfer was revealed. The developed sensor was also successfully applied for detecting FRZ in various real samples, and the results were satisfactory.

A fatty acid wax based on waste cooking oil was synthesized and could be a lower-cost alternative of commercial soybean wax.