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Titanium tetrafluoride was dissolved (20 mM to 400 mM) in water (pH= 2.1) to which was added the ionic liquid 1-methylimidazolium tetrafluoroborate (180 mM), and 650 mg of the pre-treated silica template for 50 ml of TiF4 solution in a 125-ml-volume autoclave lined with Teflon (PTFE, poly(tetrafluroethane); Parr Instruments). The silica template was selectively etched in 2 M aqueous NaOH at 80 uC for 60 min in a polypropylene beaker and the TiO2 product collected by centrifugation (3,000 r.p.m. for 60 min) and washed several times in water and ethanol. ׼ȷ·ÒëÕâ¶Î»°£¬²¢Ïêϸ˵Ã÷Õâ¸öʵÑéÔõô½øÐеģ¬·Ç³£¸Ðл£¡ ½ð±Ò¿ÉÒÔ×·¼Ó |
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