Preparation of Module Equipment using Functional Ceramic Fine Powder by Electrophoretic Deposition for Depollution of the Environment

研究了一种将沸石粉末固定在多孔衬底表面、操作简单、效率高、能从环境中收集污染物的“模块”设备的制备和评价。首先，研究了用电泳法和烧结法在金属基片上沉积合成沸石粉末的方法。合成3A沸石经EPD研磨成平均粒径为0.6μm的细粉，分散在乙醇中，沉积在1 mmφ的不锈钢丝上，沉积量约为0.3 mg/cm。此外，还在EPD沉积的钠钙硅酸盐玻璃粉的预沉积层上沉积了沸石粉，在700℃的Ar气氛中焙烧后，将沸石粉固定在上述两种样品的衬底上。烧结法发现，玻璃粉在沸石层表面扩大了裂纹，但在沸石粉和基质之间起到了连接作用，下一步，为了评价沸石模块对污染物的吸收，分别将合成的3A和4A沸石粉末沉积并固定在直径为4 mmφ的不锈钢螺杆上。将具有沸石层的六根棒材机械组装成沸石模块。将模板剂、沸石粉和压片沸石浸泡在含铵离子的溶液中，用离子色谱法测定其浓度的变化。吸收速率由大到小依次为粉剂、模组、微丸。这一结果表明，沸石模块比沸石颗粒更快地从环境中收集污染物，而且比沸石粉末更容易收集污染物。

Preparation and evaluation of a "module" equipment, in which a zeolite powder is fixed on the surface of a porous substrate and which can collect pollutants from the environment with an easy operation and high efficiency, was investigated. First, the deposition of a synthetic zeolite powder on a metal substrate by electrophoretic deposition (EPD) and fixing by firing were studied. Synthetic zeolite 3A was ground to a fine powder with an average diameter of 0.6 μm, dispersed in ethanol, and deposited on a stainless steel wire (1 mm φ) by EPD.The powder was deposited up to about 0.3 mg/cm. Furthermore, the zeolite powder was also deposited on the pre-deposited layer of a soda-lime silicate glass powder deposited by EPD.After firing in Ar atmosphere at 700℃, the zeolite powder was fixed on the substrate for the two types of samples mentioned above. The glass powder was found to serve as a connector between the zeolite powder and the substrate by firing, even though it enlarged crack on the surface of the zeolite layer.In the next step, for the evaluation of the absorption of pollutant by the zeolite module, synthetic zeolite 3A and 4A powder were deposited and fixed on stainless steel screw bars of 4 mm φ diameter, respectively. Six bars with the zeolite layer were mechanically assembled to a zeolite module. The module, the powder of the zeolite and the pressed pellet of the zeolite were soaked in solutions containing ammonium ion and the change of the concentration were measured by ion chromatography. The rate of absorption was larser in the order of powder>module>pellet. This result shows that the zeolite module can collect pollutants from the environment more rapidly than pellet, a cake of zeolite, and more easily than the powder of zeolite.