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16 results on '"Yu, Senshen"'

13. Modification and synthesis of low pour point plant-based lubricants with ionic liquid catalysis

Author

Yu Senshen, Biqiang Chen, Jingquan Wu, Kaili Nie, Xu Zhang, Yamin Wu, Wei Zhang, and Ying Shen

Subjects
060102 archaeology, Renewable Energy, Sustainability and the Environment, Chemistry, 020209 energy, Pour point, Plant based, 06 humanities and the arts, 02 engineering and technology, Biodegradation, Catalysis, Oleic acid, chemistry.chemical_compound, Ionic liquid, 0202 electrical engineering, electronic engineering, information engineering, Organic chemistry, 0601 history and archaeology, Viscosity index, Efficient catalyst
Abstract

Due to the poor biodegradability and toxicity of mineral-based lubricants, the development and application of plant-based biolubricants are increasing. However, low stability and poor low temperature performance restrict plant oils to use as lubricants directly. Hence, the paper tried to find an efficient and green way to modify the plant oil derivate oleic acid and obtained high-performance biolubricants. This study demonstrated that modification of oleic acid through epoxidation combined with ring opening reaction, and further esterification, was an efficient strategy for modifying unsaturated fatty acids for the biolubricant production. Meanwhile, catalytic effects of ionic liquids were compared with other catalysts. The results indicated that ionic liquid [HMIm][PF6] is an efficient catalyst for the ring opening and esterification for the synthesis of biolubricants with different kinds of fatty acids. Modified biolubricants from this research exhibited excellent viscosity index (>116) and low temperature performance (pour point

Published
2020

14. Synthesis, characterization, and photocatalytic antibacterial activities of porous Ce-doped TiO2 microspheres using pine pollen as novel biotemplates.

Author

Sun, Jiaqi, Yu, Senshen, Cui, Ziheng, Hu, Lin, Sun, Bowen, and Chen, Biqiang

Subjects
*PHOTOCATALYSTS, *ANTIBACTERIAL agents, *POLLEN, *MICROSPHERES, *REFLECTANCE spectroscopy, *ELECTRON paramagnetic resonance spectroscopy, *WATER disinfection
Abstract

Using pine pollen as a new biological template, Ce-doped TiO2 porous microspheres were prepared via the sol–gel method and impregnation method after high-temperature calcination. The samples were characterized using scanning electron microscopy, X-ray energy spectrum analysis, X-ray diffraction, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, electrochemistry, and electron spin resonance spectroscopy. Owing to the doping of cerium, the bionic material showed a better photocatalytic antibacterial performance, and the antibacterial rate against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, and Bacillus subtilis surpassed 99.9% within 120 min under xenon lamp irradiation. In addition, we discuss the photocatalytic sterilization mechanism of porous Ce-doped TiO2 microspheres. The antibacterial activities of this biomimetic material are mainly due to the reactive oxygen species produced by its photocatalysis; these species attack bacteria, causing them to cleave and die. Inspired by natural pollen, the materials were prepared, and they have broad application prospects for photocatalytic disinfection. [ABSTRACT FROM AUTHOR]

Published
2022
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