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Surfactant with amphiphilic substance has a vital impact on the synthesis of photocatalysts, which can affect surface property and morphology of materials. Herein, we proposed a Triton X-100 (TX-100)–assisted method for the synthesis of layered BiOBr nanosheet–assembled flower-like nanostructures. It was found that the TX-100 played a key role on the morphology and photocatalytic performance of the product. The prepared multilayered BiOBr nanosheet–assembled flower-like nanostructures exhibited larger specific surface area, broadened light absorption, and enhanced separation rate of photo-generated electrons and holes. The adsorption and photocatalytic degradation properties of ciprofloxacin (CIP) by our prepared BiOBr were investigated, and the results indicated that BiOBr assisted with 7 mL TX-100 exhibited higher adsorption ability and enhanced photocatalytic activity with 94.0% of ciprofloxacin degradation rate within 180 min. Superoxide radicals (·O2−) and holes (h+) were confirmed to be the two main reactive species for the degradation of ciprofloxacin. This work provides a novel surfactant-assisted method for the synthesis of layered nanosheet-assembled flower-like nanostructures, which would have potential applications in the photocatalytic field. The illustration of the photocatalytic degradation mechanism for ciprofloxacin under visible light. [ABSTRACT FROM AUTHOR]

Cellulose acetate film, as a biodegradable and biomass-derived material, has great potential applications in food packaging. However, the poor mechanical and antibacterial properties limit its applications. Herein, a highly flexible carbon nitride-polyethylene glycol-cellulose acetate (CN-PEG-CA) film was successfully prepared by combining graphitic carbon nitride (g-C 3 N 4) photocatalyst with cellulose acetate (CA). The g-C 3 N 4 enables the film with antibacterial activity, as a green photocatalyst. PEG softens the rigid polymer CA and crosslinks CA, PEG, and g-C 3 N 4 together by hydrogen bonding, as a flexible crosslinker. X-ray diffractometer (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectrum (FT-IR) characterizations confirmed the successful preparation of the CN-PEG-CA film. The mechanical property tests demonstrated that adding PEG increased the elongation at break of the film by about 4 times. The composite film had high antibacterial activity, and the bactericidal rates on Escherichia coli and Staphylococcus aureus were 99.98 % and 99.89 %, respectively. It effectively extended the shelf life of strawberries to 96 h and effectively maintained the quality of strawberries during storage. After 96 h, the weight loss rate of strawberries packaged with 15 % CN-PEG-CA film was 21.83 %, vitamin C content was 45.47 %, titratable acidity content was 0.89 %, and color, hardness and total soluble solids were well maintained. And biocompatibility test results showed that the film was safe and nontoxic. From the ecological and economic point of view, the highly flexible and biodegradable films with efficient photocatalytic antibacterial activity synthesized in this paper have great potential in the field of food packaging. [Display omitted] [ABSTRACT FROM AUTHOR]