聚苯胺/凹凸棒石负载纳米铁降解水溶液中甲基橙

以聚苯胺/凹凸棒石(PANI/ATP)为载体,采用液相还原法合成了负载型纳米零价铁(nZVI),用扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X射线光电子能谱分析仪(XPS)等技术手段对纳米复合材料进行表征,考察了反应时间和pH值对甲基橙降解性能的影响,对降解过程进行了动力学分析,探讨了nZVI/PANI/ATP复合材料对甲基橙的降解机理。 结果表明,nZVI/PANI/ATP复合材料在较大pH值范围内能有效降解水中甲基橙并具有降解长效性,当催化剂用量1.0 g/L,降解体积50 mL,甲基橙的浓度20 mg/L,降解时间30 min时,复合材料对甲基橙的降解率达到95.8%以上,对甲基橙的降解过程符合准二级动力学模型。

Polyaniline/attapulgite-supported Nanoscale Zero-valent Iron for Removing Methyl Orange in Aqueous Solution

In this paper, a kind of polyaniline/attapulgite(PANI/ATP)-supported nano sized zero valence iron(nZVI) composites were synthesized by the liquid-phase chemical reduction method. The as-prepared nZVI/PANI/ATP nanocomposites were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM) and X-ray photoelectron energy spectrum analyzer(XPS). The effects of the degradation time and pH on the adsorption of methyl orange on synthetic materials were investigated. Kinetic analysis and degradation mechanism were discussed. The results show that the nZVI/PANI/ATP composites can effectively degrade methyl orange over a wide range of pH and keep degradation activity in a long storage term. It is shown that more than 95.8% of methyl orange with an initial concentration of 20 mg/L and volume of 50 mL is removed from the aqueous solution after 30 min when the catalysts amount is 1 g/L. The process of the degradation of methyl orange was well described by the pseudo-second order reaction kinetics.