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.

To achieve the full utilization of waste rice noodle (WRN) without secondary pollution, activated carbon (AC) and carbon quantum dots/titanium dioxide (CQDs/TiO2) composite were simultaneously synthesized by using WRN as raw material. Both of the two materials showed potential applications in water pollution control. The AC based on WRN displayed a porous spherical micro-morphology, which could absorb heavy metal elements like Pb(II) and Cr(VI) efficiently, with a maximum equilibrium uptake of 12.08 mg·g−1 for Pb(II) and 9.36 mg·g−1 for Cr(VI), respectively. The adsorption of the resulted AC could match the Freundlich adsorption isotherm and the pseudo-second-order kinetics mode. On the other hand, the CQDs/TiO2 composite based on WRN displayed a high efficient photocatalytic degradation effect on various water-soluble dyes such as methylene blue, malachite green, methyl violet, basic fuchsin, and rhodamine B under visible light irradiation, which showed better photocatalytic performance than commercial TiO2. The introduction of CQDs based on WRN to TiO2 could result in efficient electron-hole pair separation and enable more photogenerated electrons to reduce O2 and more photogenerated holes to oxidize H2O or OH−, which could cause stronger abilities in producing O2·− and ·OH radical and better photocatalytic activity.

A CQDs/ZnO composite based on waste rice noodles displayed a highly efficient photocatalytic degradation effect on various organic pollutants.

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