Li Wang, Liu Yong, Lu HouFang. Study on the Process and Mechanism of Coating Silica on Titanium Dioxide with Ethyl Orthosilicate[J]. IRON STEEL VANADIUM TITANIUM, 2016, 37(3): 41-47. doi: 10.7513/j.issn.1004-7638.2016.03.008
Citation:
Li Wang, Liu Yong, Lu HouFang. Study on the Process and Mechanism of Coating Silica on Titanium Dioxide with Ethyl Orthosilicate[J]. IRON STEEL VANADIUM TITANIUM, 2016, 37(3): 41-47. doi: 10.7513/j.issn.1004-7638.2016.03.008
Li Wang, Liu Yong, Lu HouFang. Study on the Process and Mechanism of Coating Silica on Titanium Dioxide with Ethyl Orthosilicate[J]. IRON STEEL VANADIUM TITANIUM, 2016, 37(3): 41-47. doi: 10.7513/j.issn.1004-7638.2016.03.008
Citation:
Li Wang, Liu Yong, Lu HouFang. Study on the Process and Mechanism of Coating Silica on Titanium Dioxide with Ethyl Orthosilicate[J]. IRON STEEL VANADIUM TITANIUM, 2016, 37(3): 41-47. doi: 10.7513/j.issn.1004-7638.2016.03.008
1. School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China;
2. Pangang Group Research Institute Co., Ltd., State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua 617000, Sichuan, China
Received Date: 2016-01-06 Available Online:
2023-12-04
Dense SiO2 film was coated on TiO2 pigment by sol-gel method using ethyl orthosilicate(TEOS) as silica source.The effects of main factors on the coating process were studied.Through evaluating the coating results by SiO2 deposition quantity and acid solubility,the optimum parameters were determined.The most excellent coating effect can be obtained with amines as dispersant,parallel flow feeding mode,200 g/L of TiO2 concentration,60℃ of temperature,4% of ammonia amount added as catalyst and 1:6.9 of volume ratio of water to alcohol.Compared with the product coated by sodium silicate,the product coated with TEOS shows lower acid solubility and photocatalytic activity,indicating more compact film and better weatherability for the product coated with TEOS.SiO2 layer is proved to be coated on TiO2 particles via chemical bonding by fourier transformation infrared spectrum(FT-IR) and scanning electron microscopy(SEM) characterizations.Finally,the mechanism for coating process was analyzed based on the results of conductivity tests.
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