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Preparation and Properties Research of PSU/nano-sized Alumina（Al2O3） Blend Ultrafiltration Membrane

Author: YuZuo
Tutor: LiDongLiang
School: Xi'an University of Architecture and Technology
Course: Applied Chemistry
Keywords: ultrafiltration membrane blending modification nano-Al2O3 preparation properties
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 83
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Abstract


Ultrafiltration is the sieve pole separation process using pressure as the driving force,which is between the range of nanofiltration and microfiltration.The special nano-aperture range determines that the ultrafiltration membrane has the especial application in the field of solution purification,concentration,preparation of drinking water and material recovery currently.The main research target of the paper is to prepare the organic-inorganic blend ultrafiltration membrane using the blends of inorganic nano-Al2O3 particles and the polymer（PSU）after modification in order to improve the separatory properties,properties of physical and chemical,hydrophicity and anti-fouling of the membrane then extend its’ service life.Using polysulfone（PSU）as the materials of ultrafiltration membrane,determined the optimal process conditions and prepared the PSU ultrafiltration membrane according to investigate the various single factors on the effects of structure and performance of PSU ultrafiltration membrane in process.The factors include solvent species,concentration of PSU,additive species and content,temperature and evaporation time of casting solution,species and temperature of coagulation bath and so on.Further more,PSU and the inorganic materials of nano-Al2O3 were used to prepare blend ultrafiltration membrane in order to improve the performance of ultrafiltration membrane.Studied the factors such as concentration of PSU,content of nano-Al2O3,additive species and content and temperature of coagulation bath on the effects of structure and performance of blend films,ascertained the optimum conditions and prepared PSU/nano-Al2O3 blend ultrafiltration membrane,which has the favorable separatory properties.Investigated the structure and properties of PSU ultrafiltration membrane and PSU/nano-Al2O3 blend ultrafiltration membrane comparatively.Observed the surface morphology of films by SEM,determined the porosity to illuminate the distribution of pore,characterized the chemical composition of the membrane by FT-IR,emphatically studied the hydrophilicity,pollution resistibility and compared PSU ultrafiltration membrane with PSU/nano-Al2O3 blend ultrafiltration membrane in the change of separatory properties,and researched the physical and chemical properties of two types of ultrafiltration membranes by testing the mechanical properties,thermal stability and chemical stability.According to the results,it can be seen that the water flux of PSU ultrafiltration membrane prepared under the optimum condition and the PEG800 flux were 66.9 L·m-2·h-1 and 59.1 L·m-2·h-1 respectively,and the retention rate was 65.6%.And the flux for water and PEG800 of PSU/nano-Al2O3 blend ultrafiltration membrane were 181.8 L·m-2·h-1 and 171.0 L·m-2·h-1.Then,the retention rate was reached up to 69.2%. It was indicated that the flux and retention of ultrafiltration membrane were improved to some extent when adding the nano-Al2O3 particles into PSU membrane and blending modification.The blend ultrafiltration membrane of superior performances was prepared.

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