三种膨胀方式对蛭石结构及Pb吸附的影响

Effect of Three Expansion Modes on Vermiculite Structure and Pb Adsorption

摘要: 本论文以蛭石作为主要原料，进行高温、微波辐射、双氧水浸泡三种处理方式使蛭石膨胀，通过X射线衍射(XRD)、傅里叶红外光谱法(FTIR)、扫描电镜(SEM)对膨胀蛭石物相结构及表面官能团进行表征，探索三种膨胀方式对蛭石结构造成的影响，并对膨胀蛭石进行Pb(II)吸附实验。结果表明：高温处理会破坏蛭石晶体结构，微波辐射使蛭石-OH消失。原样及三种样品对Pb(II)的吸附量分别为25.26 mg/g、30.81 mg/g、31.69 mg/g、35.64 mg/g，吸附效果均优于原样，其中双氧水浸泡为最优方法其次为微波辐射、高温。

Abstract: In this thesis, vermiculite was expanded by three treatments: high temperature, microwave radiation, and hydrogen peroxide. The physical phase structure and surface functional groups of the expanded vermiculite were characterized by X-ray diffraction (XRD). Fourier infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) were used to explore the effects of different methods on the structure. The results showed that high temperature treatment destroyed the crystal structure of vermiculite and microwave radiation caused the disappearance of vermiculite-OH. The adsorption of Pb(II) was 25.26 mg/g, 30.81 mg/g, 31.69 mg/g and 35.64 mg/g for the original and three samples. And the hydrogen peroxide immersion was the best.