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以二氧化钛为原料,通过水解热解法制备得到二氧化钛纳米管(TN)。采用BET分析了孔的结构,结果表明,二氧化钛纳米管的比表面积164cm2/g,孔的容积0.7cm~3/g,这些参数与商业化销售的二氧化钛粉末(比表面积为40cm~2/g,孔的容积为0.1cm3/g)相比较,有很大程度的提高。再以氧化石墨烯、二氧化钛纳米管、硫酸亚铁为原料,通过水热合成法制备得到锐钛二氧化钛纳米管氧化石墨烯复合水凝胶(GO-TN-H)。通过吸附等温线分析研究,研究了GO-TN-H对水中氟离子的吸附性能。研究结果表明,GO-TN-H对氟离子的最大吸附容量达到了105.59mg/g,Freundlich方程比Langmuir方程能更好地拟合其吸附行为。通过再生实验考察了氢氧化钠溶液对GO-TN-H的再生效率。结果表明,复合水凝胶在0.5mol/L的氢氧化钠溶液中,经过8h浸泡,GO-TN-H脱附率达到87.5%,达到了预期效果。
With titanium dioxide as raw material, titanium dioxide nanotubes (TN) were prepared by hydrolytic pyrolysis. The pore structure was analyzed by BET. The results showed that the specific surface area of titania nanotube was 164cm2 / g and the pore volume was 0.7cm ~ 3 / g. These parameters were in good agreement with those of commercially available titania powders (specific surface area 40cm2 / g, Hole volume of 0.1cm3 / g) compared to a significant increase. Then anatase titania nanotube graphene oxide hydrogel (GO-TN-H) was prepared by hydrothermal synthesis using graphene oxide, titania nanotube and ferrous sulfate as raw materials. By adsorption isotherm analysis study, GO-TN-H on fluoride ion adsorption properties. The results showed that the maximum adsorption capacity of GO-TN-H to fluoride ions reached 105.59mg / g, and the Freundlich equation better fitted the adsorption behavior than Langmuir equation. The regeneration efficiency of GO-TN-H by sodium hydroxide solution was investigated through regeneration experiments. The results showed that the composite hydrogel in 0.5mol / L sodium hydroxide solution, after 8h soaking, GO-TN-H desorption rate of 87.5%, to achieve the desired results.