| Effect of SiO2 sol content on Al2O3-SiO2-TiO2 composite membrane |
| Authors: Tong Zhi,Wang Sai,Chen Fang-fang,Wang Jie |
| Units: School of Environmental and Chemical Engineering,Xi’an Polytechnic University,Xi’an 710048,China |
| KeyWords: Al2O3-SiO2-TiO2 composite membrane; sol-gel method;preparation; Characterization |
| ClassificationCode:TQ174.75 |
| year,volume(issue):pagination: 2014, 34(1):34-38 |
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Abstract: |
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Using sol-gel prepared Al2O3-SiO2-TiO2 composite membrane by different proportions of Al2O3, SiO2 and TiO2 sol. A comprehensive analysis of the stability of the sol, the thermal stability of the composite membrane, structural characteristics and surface morphology has conducted by characterization means of gel time, TG-DTG, FT-IR and AFM . Experimental results show that: SiO2 sol content is the main factor that affect the stability of the composite sol .With the increase of the content of SiO2 sol, the stability of the composite sol is smaller, the shorter the gel time, shortening the time of membrane formation; TG-DTG analysis showed that, after 350°C,no significant thermal effects, we can see a three-component composite membrane has better thermal stability; FT-IR showed that the Si-O-Si is main frame structure for the entire composite system ,and a more stable oxygen-bridge bonds (Si-O-Al and Ti-O-Al-O-Si, etc.)has formed network Structure; AFM analysis showed that the higher porosity of the composite membrane having nano-sized pores, within the range of 5μm, the membrane surface is not flat, the defects can be reduced by repeating the coating membrane, the average pore size is about 54nm. |
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Funds: |
| 陕西省科技厅工业攻关项目(2009K06-27) |
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AuthorIntro: |
| 同 帜( 1963- ) ,男,高级工程师.主要从事无机陶瓷膜制备的研究. E- mail: tongzhi63@ Yahoo.com.cn |
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Reference: |
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[1] 吴建锋,张欣,徐晓虹等.Al2O3-SiO2-ZrO2-TiO2复合薄膜结构及形貌的研究.[J].武汉理工大学学报,2006,28(7):1~4。 |
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