锐钛型TiO_2纳米管与石墨烯复合水凝胶对氟离子的吸附性能研究  

STUDY ON THE ADSORPTION OF FLUORINION WITH COMPOSITE HYDROGEL CONSISTING OF ANATASE TiO_2 NANOTUBES AND GRAPHENEOXIDE

作　　者：郑凯[1] 张俊[1] 郑兴业[1] 徐莎莎[1] 黄健榕[1] 李文月[1] 

机构地区：[1]南京工程学院环境工程学院,南京211167

出　　处：《离子交换与吸附》2016年第5期472-480,共9页Ion Exchange and Adsorption

基　　金：2015年度南京工程学院大学生实践训练计划(201511276038Y);南京工程学院创新基金面上项目(CKJB201410)

摘　　要：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。Titania nanotubes （TN） were prepared by the hydrolysis of titanium dioxide as raw materials. BET was used to analyze the pore structure of the material. The results showed that the specific surface area of TiO2 nanotubes was164cm2/g, the pore volume was 0.7cm3/g. These parameters have a great degree of improvement compared with Titanium dioxide powder of commercial product （the specific surface area is about 40cm2/g, the pore volume was 0. lcm3/g）. Hydrothermal method （GO-TN-H） could be preparared by titanium dioxide nanotubes and grapheme oxide with the reduction of ferrous sulfate. The experiment was determined by adsorption isotherm. The adsorption properties of fluorine ion in water by GO-TN-H were studied. The experimental results showed that the maximum adsorption capacity of fluoride ion by GO-TN-H was 105.59mg/g, the adsorption behavior is better fitted with Freundlich model than that of Langmuir model. The recovery efficiency of sodium hydroxide solution to GO-TN-H was determined by regeneration experiment. The results indicated that GO-TN-H desorption rate reached 87.5% by 0.5mol/L sodium hydroxide solution for 8h and achieved the desired target.

关 键 词：氧化石墨烯 锐钛型二氧化钛纳米管 复合水凝胶 氟离子 吸附 再生 

分 类 号：O647.3[理学—物理化学]