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以P25为原料,通过水解热解法制备得到二氧化钛纳米管(TN)。采用SEM和TEM分析了TN的形貌,TN的管径为6nm,长度为1~1.2μm。以氧化石墨、TN、硫酸亚铁为原料,通过一步水热合成法,制备得到石墨烯二氧化钛纳米管-铁水凝胶(GO-TN-H),将其冷冻干燥后得到石墨烯二氧化钛纳米管-铁气凝胶(GO-TN-G)。采用BET分析了TN和GO-TN-G的孔结构,结果表明,TN的平均孔径为14nm,孔的容积为0.6cm~3/g,比表面积为160m~2/g;GO-TN-G的比表面积为162m~2/g。通过吸附等温线测定实验,研究了GO-TN-H对环丙沙星的吸附性能。GO-TN-H对环丙沙星的最大吸附容量可达750mg/g,Langmuir方程比Freundlich方程能更好拟合其吸附行为。结合SEM、TEM、BET等分析结果,推断认为水凝胶表面存在的官能团与环丙沙星表面基团之间的物理和化学吸附作用,使得GO-TN-H对环丙沙星有较强的吸附性能。该水凝胶吸附剂对环丙沙星的最大吸附容量是国内文献报道数值的3~3.5倍,是国外现有报道数值的1~1.5倍。该吸附剂具有制备过程简单,吸附量大,应用前景广阔等特点。
With P25 as raw material, titania nanotubes (TN) were prepared by hydrolytic pyrolysis. The morphology of TN was analyzed by SEM and TEM. The diameter of TN was 6nm and the length was 1 ~ 1.2μm. Graphene titania nanotubes-ferric hydrogel (GO-TN-H) was prepared by one-step hydrothermal synthesis using graphite oxide, TN and ferrous sulfate as raw materials, which were freeze-dried to obtain graphene titania nanotubes- Iron Airgel (GO-TN-G). The pore structure of TN and GO-TN-G was analyzed by BET. The results showed that the average pore diameter of TN was 14nm, the pore volume was 0.6cm ~ 3 / g and the specific surface area was 160m ~ 2 / g. The specific surface area of 162m ~ 2 / g. The adsorption of GO-TN-H on ciprofloxacin was studied by adsorption isotherm experiment. The maximum adsorption capacity of GO-TN-H to ciprofloxacin was up to 750 mg / g. The Langmuir equation fitted the adsorption behavior better than the Freundlich equation. Combined with the results of SEM, TEM and BET, it is concluded that the physical and chemical adsorption between the functional groups on the surface of hydrogels and the surface groups of ciprofloxacin can be deduced, which makes GO-TN-H stronger for ciprofloxacin The adsorption performance. The maximum adsorption capacity of the hydrogel adsorbent for ciprofloxacin is 3 to 3.5 times that reported in the domestic literature, which is 1 to 1.5 times the reported value in foreign countries. The adsorbent has the advantages of simple preparation process, large adsorption amount and broad application prospect.