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Shuyi Chu,Yilei Yao,Xinggan Sun,Jibo Xiao,Xiao Ma,Hongcai Guan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-
A novel magnetic polyurethane (PU) composite, PU/OA@Fe3O4 (MPU), was synthesized using oleic-acidcoatedFe3O4 nanoparticles. The response surface method based on the Box-Behnken design wasemployed to optimize the synthesis of MPU. Scanning electron microscopy, X-ray diffraction, X-ray photoelectronspectroscopy, Fourier-transform infrared spectroscopy, thermogravimetry, and saturated magnetizationwere employed to characterize the MPU. The conditions for optimal synthesis of MPU were asfollows: 0.65 g of catalyst A, 0.42 g of catalyst B, 2.11 g of organic silicon resin FS-05, and a toluene diisocyanateindex of 112. The saturated magnetization of MPU at an OA@Fe3O4 of 8% and 10% were 21.19 and32.83 emu/g, respectively. The improvement in removal performance of a sequencing batch biofilm reactorwith MPU compared to conventional PU was also investigated. Removal of ammonia nitrogen, totalnitrogen, chemical oxygen demand, and total phosphorus were all improved, compared to PU, by11.73%, 9.13%, 11.22%, and 10.34%, respectively. At the end of the experiment, total and volatile biomassof MPU were 542 and 375 mg/g, respectively, which were 30 and 100 mg/g greater than those of PU. Inaddition, the biofilms growing on MPU contained considerably more proteins and tightly bound extracellularpolymeric substances than those growing on PU.
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