| With the shortage of fossil fuels and the aggravation of environmental pollution,bioalcohols play an important role.Pervaporation has significant advantages in the separation of bioalcohols.Polydimethylsiloxane（PDMS）membranes are considered as the benchmark for bioalcohol-selective permeable membranes.However,PDMS pervaporation membranes still have some problems,such as slow curing rate,large amount of organic solvents and serious membrane pollution.This topic starts from the preparation and application of PDMS membranes,changes the preparation method of PDMS membranes,realizes the green preparation process of PDMS membranes,further improves the pervaporation and biological pollution resistance of PDMS membranes,and increases the possibility of industrial scale-up.Firstly,two key technical obstacles need to be solved in the preparation process of PDMS,namely:（1）Long membrane preparation time and the use of a large number of organic solvents hinder its industrial application;（2）The trade-off between membrane separation and biological contamination resistance limits the practical application process.In this study,an UV-polymerized fluoromonomer（F-monomer）was introduced into methacrylate modified PDMS（MA-PDMS）membrane forming system to replace the use of organic solvents and realize the ultra-fast green membrane making process（31-72 s）.The results showed that the introduction of fluorine monomer reduced the viscosity of the film and enhanced the coatability of the membrane solution.At the same time,the hydrophobicity of the membrane surface was enhanced by fluorine monomer,and the contact Angle of water reached 112°.The flux(862-1216 g m-2 h-1)and separation factor（34-41）of MA-PDMS-F membranes were enhanced when used for the separation of butanol/aqueous solution.Secondly,the preparation of organic polymer membranes by UV crosslinking method has been widely concerned because of its advantages such as fast curing speed and controllable operation.However,prolonged UV exposure poses a significant threat to both the environment and the operator.Here,we developed a visible light crosslinked polymerized pervaporation membrane for the separation of furfural.The differences among photoinitiator ethyl（2,4,6-trimethylbenzoyl）phenylphosphinate（TPO-L）,diphenyl（2,4,6-trimethylbenzoyl）phosphine oxide（TPO）and 2-hydroxy-2-methylpropiophenone（1173）in the polymerization kinetics,membrane structure and separation performance are compared.The results show that TPO-L matches with visible light at 405 nm.TPO-L has good compatibility with PDMS and high photoinitiation efficiency.Furthermore,the membrane preparation parameters such as TPO-L content and PDMS viscosity were optimized.The optimal membrane flux was 1299.5 g m-2 h-1,and the furfural separation factor was 40.2,which had significant advantages.Most importantly,the membrane was amplified and prepared by a continuous membrane making device in this study.The performance of the amplified membrane was excellent,which indicated its great potential for large-scale application. |
