| 改性埃洛石材料的制备及其对亚甲基蓝吸附行为的研究 |
| 点此下载全文 |
|
| 基金项目:国家自然科学基金项目(21365012) |
|
| 中文摘要:使用硅烷偶联剂KH550改性埃洛石纳米管获得改性材料HNTs-APTS，并对其吸附亚甲基蓝的行为进行研究。利用傅立叶变换红外光谱仪(FTIR)、X-衍射仪(XRD)对改性前后的埃洛石进行表征。考察了吸附时间和温度对吸附过程的影响，并采用Lagrange 准二级动力学方程、Langmuir 等温线方程及Freundlich 等温线方程对实验数据进行拟合。结果表明，KH550成功负载到埃洛石表面；改性后材料的吸附能力大大提高。改性埃洛石对亚甲基蓝的吸附约在60 min达平衡，最大吸附容量为21.66 mg/g。其吸附过程符合准二级动力学方程，热力学较好地符合Langmuir等温线方程，且吸附过程为自发吸热，升高温度有利于吸附的进行。改性材料可重复再生6次，具有良好的再生性能，可在工业处理亚甲基蓝废水中使用。 |
| 中文关键词:改性埃洛石 硅烷偶联剂 亚甲基蓝 吸附 |
| |
| Fabrication of Modified Halloysite Nanotubes and Their Adsorption Behavior for Methylene Blue |
|
|
| Abstract:Halloysite nanotubes(HNTs) were modified with silane coupling agent 3-triethoxysilylpropylamine(APTS) and their sorption behavior for methylene blue(MB) was investigated.Halloysite nanotubes composites before and after modification were characterized with Fourier transform infrared spectrometer(FTIR) and X-ray diffractometer(XRD).The sorption behavior of the modified halloysite nanotubes for methylene blue was studied as a function of contact time and temperature.The Lagrange pseudo-second order kinetic model,Langmuir isotherm and Freundlich equation were used to fit the data.The results showed that the modified HNTs were successfully obtained and the sorption capacity of the modified HNTs for methylene blue was high.The modified adsorbent had a rather rapid adsorption rate and reached adsorption equilibrium in 60 min.The maximal sorption capacity was 21.66 mg/g,which was higher than that of the unmodified halloysite nanotubes.The sorption process of methylene blue by the modified halloysite followed the pseudo second order kinetic model,and the adsorption process was mainly physical adsorption.The data for methylene blue system were fitter for the Langmuir isotherm model rather than Freundlich model.Thermodynamic parameters depicted the endothermic nature of adsorption and the process was spontaneous,and the sorption of methylene blue was increased with the increase of temperature.Furthermore,the as prepared adsorbent could be reused six times at least,which indicated that the modified HNTs have a potential usage in waste-water treatment. |
| Key Words:modified halloysite silane coupling agent methylene blue adsorption |
| 引用本文：王欣，陈元涛，张炜，赫文芳，王建，陈必清.改性埃洛石材料的制备及其对亚甲基蓝吸附行为的研究[J].分析测试学报,2016,35(6):729-733. |
| 摘要点击次数: 1982 |
| 全文下载次数: 1054 |
| 查看全文 下载PDF阅读器 |
|
|
