摘要本文采用水热法合成二氧化钛纳米管,用透射电子显微镜(TEM)、X射线衍射仪(XRD)以及比表面积测试仪(BET)对二氧化钛纳米管的粒径、形貌和比表面积进行表征并研究二氧化钛纳米管对全氟辛烷磺酸(PFOS)的吸附效果。63815
二氧化钛纳米管的性能表征结果说明:合成的二氧化钛纳米管主要以管状形式存在,晶型主要是锐钛矿相晶体。孔径为24.02 nm,比表面积为302.62 m2/g。
根据实验结果,可以得到当PFOS的初始浓度为300 mg/L,pH为2.5,温度为25 ℃,二氧化钛纳米管的投加量为0.02 g,吸附时间为24 h时,可达到最佳吸附,最大吸附量为340 mg/g。实验还发现,溶液的pH值对PFOS在二氧化钛纳米管上的吸附效果影响较大,当溶液的pH为2.5时,吸附量最大;而背景离子浓度对PFOS在二氧化钛纳米管上的吸附效果的影响则可以忽略不计。研究二氧化钛纳米管对PFOS吸附的吸附等温线和吸附动力学发现,吸附过程满足Langmuir吸附等温线和准二级吸附动力学。
毕业论文关键词 全氟辛烷磺酸 二氧化钛纳米管 吸附
毕业设计说明书(论文)外文摘要
Title Study on the adsorption properties of TiO2 nanotubes adsorping PFOS in water
Abstract In this paper, the TiO2 nanotubes are prepared by hydrothermal method. The particle size, morphology and specific surface area of the TiO2 nanotubes are characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and specific surface area the tester (BET) and the adsorption effect of the PFOS on the TiO2 nanotubes is studied.
The results of Characterization of TiO2 nanotubes are that synthesis of TiO2 nanotubes exists in tubular form, crystalline form is mainly anatase crystals. The pore size is 24.02 nm and the specific surface area is 302.62 m2/g.
According to the experimental results, the best adsorption can be achieved when the initial concentration of PFOS is 300 mg/L, pH is 2.5, the temperature is 25 ℃, the TiO2 nanotubes dosage is 0.02 g and the adsorption time is 24 h. The maximum adsorption amount is 340 mg/g. It is also found that the effect of the pH on the adsorption is large. When the pH of the solution becomes 2.5, the maximum amount of adsorption can be got. While the effect of the background ion concentration on TiO2 nanotubes adsorping PFOS is negligible. Studying the adsorption isotherm and adsorption kinetics of PFOS adsorption on TiO2 nanotubes, it can be got that the adsorption process fits the Langmuir adsorption isotherm and pseudo-second order kinetic model.
Keywords PFOS TiO2 nanotubes adsorption
1 绪论·1
1.1 PFOS的概述·1
1.1.1 PFOS的来源·1
1.1.2 PFOS的危害·1
1.1.3 PFOS的处理·2
1.2 吸附理论·2
1.2.1 吸附理论2
1.2.2 吸附材料3
1.3 PFOS的吸附处理·3
1.4 二氧化钛纳米管概述·3
1.4.1 二氧化钛纳米管的简介4
1.4.2 二氧化钛纳米管的应用4
1.4.3 二氧化钛纳米管的制备方法4
1.5 本文的研究思路及主要内容·6
2 实验药品、仪器和研究方法·7
2.1 实验药品及仪器·7
2.2 二氧化钛纳米管的制备·7
2.3 材料结构的表征方法·8
2.3.1 X-射线衍射(XRD)8
2.3.2 透射电镜(TEM)测试分析·8
2.3.3 比表面积(BET)测试分析·8
2.4 PFOS的测试方法·8