X型Gemini表面活性剂改性类水滑石的制备及其吸附对甲酚性能

传统表面活性剂-类水滑石(HTlc)纳米复合物可有效吸附水中主要有机污染物酚类污染物,如酚类污染物,以高性能Gemini双子表面活性剂代替传统表面活性剂有望提高其去除效率。本文采用剥离-重组法制备了X型Gemini表面活性剂(MXC_6)-HTlc纳米复合物,并采用粉末X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、比表面和元素分析等技术手段对样品进行了表征。结果表明,MXC_6成功重组于HTlc层间。分别从吸附动力学和热力学研究了MXC_6-HTlc纳米复合物对对甲酚的吸附行为:吸附动力学曲线符合准一级动力学方程;吸附等温线符合Linear方程;吸附量显著高于HTlc,且随p H值和温度的增加而降低。实验表明,MXC_6-HTlc纳米复合物是一种新型高效水中酚类污染物处理剂。

Adsorption of p-Cresol on X-Type Gemini Surfactant-modified Hydrotalcite-like Nanocomposite

Traditional surfactant-hydrotalcite-like(HTlc) nanocomposites can effectively adsorb the main organic pollutants, such as phenolic pollutants, in water. With high performance Gemini surfactant instead of traditional surfactant, an improved removal efficiency of surfactant-HTlc nanocomposites for organic pollutants is expected. In this paper, Gemini surfactant(MXC₆)-HTlc nanocomposite was prepared by delamination/reassembling method. The material was characterised by powder X-ray diffraction, Fourier transform infrared spectroscopy, specific surface area, atomic absorption spectrometry, and elemental analysis. The results show that MXC₆ anions are reassembled in the layers of HTlc. The adsorption behavior of p-cresol on MXC₆-HTlc nanocomposite was then investigated. The adsorption kinetics and adsorption isotherm of p-cresol on MXC₆-HTlc nanocomposite well fitted pseudo-first order kinetics and Linear equation, respectively. These results indicate that the adsorption amount of p-cresol on MXC₆-HTlc nanocomposite, is much higher than that on HTlc, and is decreased by increasing either pH(5.00~10.00) or temperature. The adsorption mechanism was discussed in detail. It is confirmed that MXC₆-HTlc nanocomposite can be as a new kind of highly effective adsorbent for phenolic pollution from water.