Fatty acid photodecarboxylase, recently found in Chlorella variabilis NC64A ( Cv FAP), could efficiently catalyze C16-C18 fatty acids into C1-shortened hydrocarbons under visible light. This provides an alternative approach for hydrocarbon fuels production in mild conditions compared with hydrotreating of oils. In this study, a cascade system integrating lipase hydrolysis and Cv FAP decarboxylation was demonstrated for the efficient production of hydrocarbon fuels from waste oils. The continuous Cv FAP-catalyzed decarboxylation characteristics and performance of free fatty acids derived from waste oil were investigated for the first time. A hydrocarbon fuel production rate of 18.4 mM/h was obtained at a residence time of 50 min. The regulation of pH value from 6.8 to 8.5 significantly improved the activity of Cv FAP, thereby obtaining an optimal conversion of 61.2%. The precipitation of palmitic acid caused a low conversion (37.9%) compared with the other fatty acids, further inhibiting hydrocarbon production. In such a cascade system, various oils can be converted to hydrocarbon fuels with a concentration of 8.97–15.3 mM. A high energy production rate of 204.3 kJ/L/h was achieved, which exhibited the advancement in high-quality biofuel production.
Yang Wan,Huijie Wang,Jiejing Liu,Xin Liu,Xianghai Song,Weiqiang Zhou,Jisheng Zhang,Pengwei Huo
Waste plastics have posed enormous to the environment, but their recycling, especially polyethylene terephthalate plastics, was still a huge challenge. Here, CdS/CeO 2 was used as the photocatalyst to promote the degradation of PET-12 plastics by activating peroxymonosulfate (PMS) synergistic photocatalytic system. The results showed that 10 % CdS/CeO 2 had the best performance under the illumination condition, and the weight loss rate of PET-12 could reach 93.92 % after adding 3 mM PMS. The effects of important parameters (PMS dose and co-existing anions) on PET-12 degradation were systematically studied, and the excellent performance of the photocatalytic-activated PMS system was verified by comparison experiments. SO 4 •− contributed the most to the degradation performance of PET-12 plastics, which was demonstrated by electron paramagnetic resonance (EPR) and free radical quenching experiments. Furthermore, the results of GC showed that the gas products including CO, and CH 4 . This indicated that the mineralized products could be further reduced to hydrocarbon fuel under the action of the photocatalyst. This job supplied a new idea for the photocatalytic treatment of waste microplastics in the water, which will help recycle waste plastics and recycle carbon resources.
危险品化学品经营许可证（带存储）