纳米银/蒙脱土催化剂的制备及对亚甲基蓝的催化降解

以层状蒙脱土为载体及抗坏血酸为还原剂合成出了纳米银/蒙脱土催化剂，在剥离后蒙脱土片层上均匀分散着粒径为30-40 nm 的银颗粒。该催化剂具有优异的室温降解亚甲基蓝的活性。通过不同温度下对催化剂的热处理和催化活性的评价，并用X光衍射（XRD）、透射电镜（TEM）和原子吸收光谱（AAS）等进行了结构表征，结果表明纳米银在蒙脱土上的分散性和负载量是影响其催化活性的主要因素，在低于200℃的焙烧温度下催化剂仍具有较高的催化活性。

Preparation of nanosilver/montmorillonite catalysts and their use in catalytic degradation of methylene blue

The preparation of a highly-dispersed nanosilver/montmorillonite (MMT) catalyst with uniform distribution of particle size of silver ranging from 30~40 nm located on the platelets of exfoliated MMT as the catalyst support and using ascorbic acid as the reducing agent is described. The catalyst shows excellent activity for the catalytic degradation of methylene blue near room temperature. The catalytic activity of materials prepared at different calcination temperatures were compared and the materials were characterized by X-ray diffraction (XRD), transmission Electron Microscopy (TEM) and atomic absorption spectrometry (AAS). The results indicate that the catalytic activity mainly depends on the dispersivity and loading amount of nanosilver on MMT. High dispersivity can be maintained at calcination temperatures below 200℃.