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质表面的“模块”装置的制备和评价，该装置能高效、简便地收集环境中的污染物。首先，研究了通过电泳沉积（EPD）在金属基底上沉积合成沸石粉末和通过烧制固定。将合成的3A沸石研磨成平均粒径为0.6 μm的细粉，分散在乙醇中，并通过电泳沉积在不锈钢丝（1 mm φ）上，粉末沉积至约0.3mg/cm。此外，还将沸石粉沉积在电泳沉积的钠钙硅酸盐玻璃粉的预沉积层上，并在Ar气氛中于700℃焙烧后，将沸石粉固定在上述两种样品的基体上。通过焙烧，发现玻璃粉虽然增大了沸石层表面的裂纹，但起到了沸石粉与基材之间的连接剂的作用。为了评价沸石模块对污染物的吸附，将合成沸石3A和4A粉分别沉积并固定在直径为4 mm φ的不锈钢螺杆上。将具有沸石层的六个棒机械组装到沸石模块。将沸石模块、沸石粉末和沸石压制颗粒浸泡在含铵离子的溶液中，并通过离子色谱法测量浓度的变化。吸附率大小顺序为粉末>模块>颗粒。该结果表明，沸石模块可以比颗粒、沸石块更快速地从环境中收集污染物，并且比沸石粉末更容易。

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.