石墨烯二氧化钛纳米管-铁水凝胶对环丙沙星吸附性能的研究  

ADSORPTION CAPACITY OF GRAPHENE TITANATENANOTUBE-Fe HYDROGEL TO CIPROFLOXACIN

作　　者：戴荣[1] 郑兴业[2] 曹力涛 吴宵[2] 张满盛 韩永忠[1] 郑凯[2] 

机构地区：[1]南京大学环境学院,污染控制与环境化研究国家重点实验室,南京210023 [2]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4期368-376,共9页Ion Exchange and Adsorption

基　　金：2015年度南京工程学院大学生科技创新项目基金(N20151201)

摘　　要：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。Titanate nanotube （TN） was prepared by hydrolytic and pyrolytic method with P25 as raw material. SEM and TEM images showed that the diameter of TN was 6nm and the length was ranged from 1μm to 1.2μm. Graphenetitanate nanotube-Fe hydrogel （GO-TN-H） was prepared by hydrothermal synthesis method with graphite oxide （GO） TN and ferrous sulfate as raw materials, and then graphenetitanate nanotube-Fe aerogel （GO-TN-G） was obtained by freeze-drying. The pore characteristics of TN and GO-TN-G was obtained by BET method. The results showed that （1） the average pore diameter, pore volume and the specific surface area of TN wasl4nm, 0.6cm3/g and 160m2/g, respectively; （2） the specific surface area of GO-TN-G was 162m2/g. The adsorption isotherm of ciprofloxacin in aqueous solution onto GO-TN-H was investigated and the resultsindicated that the maximal adsorption capacity was 750mg/g, and the adsorption isotherm of GO-TN-H was better fitted with Langmuir model than with Freundlich model. The adsorption properties of GO-TN-H for ciprofloxacin were attributed to physical and chemical adsorption interaction between functional groups on the surface of hydrogels and groups of ciprofloxacin. The maximal adsorption capacity of ciprofloxacin onto GO-TN-H was 3 to 3.5 times of the recent data reported domestically, and 1-1.5 times of the latest results reported abroad. The adsorbent of GO-TN-H was a facile preparation technique with higher adsorption capacity and extensive application prospect.

关 键 词：石墨烯 二氧化钛纳米管 水凝胶 环丙沙星 强化吸附 

分 类 号：TQ425[化学工程]