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固定在多孔基材表面的“模块”设备的制备和评价，该设备操作简单，效率高，可以收集环境中的污染物。首先，研究了合成沸石粉体在金属基体上的电泳沉积（EPD）和烧制固定。将合成的3A沸石磨成平均直径为0.6 μm的细粉，分散在乙醇中，用EPD沉积在1 mm φ的不锈钢丝上。粉末沉积量约为0.3 mg/cm。此外，沸石粉末还沉积在EPD沉积的钠钙硅酸盐玻璃粉末的预沉积层上。在700℃氩气中烧制后，将沸石粉固定在上述两种样品的衬底上。通过烧制，发现玻璃粉在沸石粉和衬底之间起到了连接的作用，尽管它扩大了沸石层表面的裂纹。下一步，为了评价沸石模块对污染物的吸收，将合成沸石3A和4A粉末分别沉积并固定在直径为4 mm φ的不锈钢螺杆上。六个带有沸石层的棒材被机械组装成一个沸石模块。将模组、沸石粉和沸石压粒分别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。粉体>模块>级颗粒的吸收率较大。结果表明，沸石组件比颗粒状沸石饼状沸石更能快速地收集环境中的污染物，比粉状沸石更容易收集。

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.