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Non-stoichiometric Ce -doped nano- SiO_2 / polysulfone composite membrane and its properties

Author: TuZhengYu
Tutor: ZhangYuQing
School: Tianjin University
Course: Chemical Engineering
Keywords: Nano Non-stoichiometric Doping SiO2 Cerium Polysulfone membrane Hydrophilic properties
CLC: TQ028.8
Type: Master's thesis
Year: 2007
Downloads: 54
Quote: 1
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Abstract


Oily waste water as a common source of pollution, environmental protection and ecological balance harm, and water is an important resource for the production and life, so oily waste water separation is very important. The traditional method of treating wastewater and some oil separation efficiency is not high, there is a high energy consumption, high cost. To compensate for these shortcomings, in recent years, membrane separation technology applied to oily wastewater treatment began, it has low energy consumption, high separation efficiency, the device is small. In the use of membrane separation when the oily wastewater treatment, membrane fouling and concentration polarization separation performance degradation caused by restricted its technological potential of the play. Therefore, the development of membrane fouling water has a very important theoretical and practical significance. This is the core technology for membrane modification of membrane material, the preparation having a high activity, strongly hydrophilic properties of Ce-doped SiO2 composite nano-particles filled polysulfone membrane, its surface modified hydrophilic sex. Determine the performance of the hydrophilic composite membrane suitable for film formation conditions: PSF concentration of 16wt.%, PEG400 PSF mass content of 10% of nano-SiO2 composite particle content of 10% weight of PSF, the intermittent ultrasonic conducted pre-evaporation time is 10s, coagulation bath temperature of 20 ℃. Angle by mechanical strength and hydrophilicity of the test, indicating that the strength of the composite membrane and hydrophilic properties are improved; investigated by scanning electron microscopy of the microstructure of the composite membrane, the results show that the composite film is composed of a dense layer and the adjacent surface of the porous support layers, and wherein the nanocomposite particles dispersed; infrared spectroscopy and X-ray diffraction results show that there are a lot of composite membrane surface hydroxyl groups, and nano-composite particles tightly bound to the membrane. Its physical properties, hydrophilic properties, separation performance, anti-pollution performance than pure polysulfone membrane. Separating the composite membrane used in a concentration of 65mg / L of oil in water, influence of different film obtained under the conditions of the oil-water separation composite membrane performance and properties of resistance to pollution, the results that the use of nano-composite particles mass PSF 10% of the prepared composite membrane separation performance, resistant to pollution best performance; retention rate reached 98.89%, the effluent oil content of 0.72 mg / L, up to the national emission standards for water quality, and after using the composite membrane after washing after six , water flux can still be returned to the initial 85%. This paper also antifouling performance composite membranes made a preliminary study, from the rare-earth doped Ce nano-SiO2 composite particles added polysulfone membrane structure of the membrane material and the promotion of film mass transfer inside the angle of in-depth analysis.

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical processes ( physical processes and physical and chemical processes ) > Separation process > New separation method
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