Electrophoretic Deposition and Fixing of Functional Mineral Fine Powder-Examination of the Technique to Prepare a Throw-in Type Environmental Cleaning Module -

功能性矿物细粉的电泳沉积与固定-投入式环境清洁模块制备技术的检验-

• 批准号: 14550698
• 负责人: HAYASHI Shigeo
• 金额: $ 2.3万
• 依托单位: Akita University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550698/
• 关键词: Environmental cleaning; Mineral; Adsorption; Fine powder; Electrophoretic Deposition; Fixing; Solid-liquid reaction; Zeolite; 吸着材; モジュール化; オパールCT; 成形

Environmental pollution is still a serious problem in the society in these days. There is a possibility that some natural minerals can be used to clean the environment because they have large surface area for adsorbing various chemicals and/or superior ion-exchange ability. In order to remove harmful materials from the environment with high efficiency, the electrophoretic deposition (EPD) and fixing of various functional mineral powders on porous substrate to prepare a throw-in type environmental cleaner was investigated ; such deposited materials can be exposed to a large amount of polluted natural water rapidly. We studied : (1)the fixing of a natural zeolite (clinoptilolite, yielded in Akita prefecture, Japan) ~fine powder by a solid-liquid chemical reaction, (2)the effect of the chemical composition of reacting materials with the natural zeolite in the reaction (1), and (3)the EPD of opal-CT fine powder, which is difficult to be deposited by a normal EPD process. In the experiments, mineral powders finely ground with a planetary potmill around <1μm were used. As a result of the studies, the following results have been cleared : (1)the natural zeolite (clinoptilolite) fine particles can be grew and fixed each other by a solid-liquid chemical reaction using Na_2O-Al_2O_3-SiO_2-H_2O reacting materials in the reaction at 90℃ for longer than 24 h, (2)the clinoptilolite particle was changed into various zeolite by changing the composition (mainly in the ratio SiO_2/Al_2O_3) of the reacting material, and (3)very fine opal-CT powder can be deposited on an electrode by the co-deposition with a soda-lime glass powder with larger particle size which can be deposited easily by the EPD. As stated above, the the possibility of the preparation of a high-performance adsorbing material prepared from natural minerals was proved in this study.

环境污染仍然是当今社会的一个严重问题。一些天然矿物具有吸附各种化学物质的大表面积和/或上级离子交换能力，因此有可能用于清洁环境。为了高效去除环境中的有害物质，采用电泳沉积（EPD）技术将多种功能性矿物粉体固定在多孔基材上，制备了一种投入式环境净化剂，该净化剂可快速接触大量受污染的天然水。我们研究了：（1）通过固-液化学反应固定天然沸石（斜发沸石，产自日本秋田县）-细粉末，（2）在反应（1）中与天然沸石反应的反应材料的化学组成的影响，和（3）难以通过常规EPD工艺沉积的蛋白石-CT细粉末的EPD。在实验中，使用了用行星式球磨机精细研磨的小于1μm的矿物粉末。研究结果表明，以下结果已被清除：（1）天然沸石以Na_2 O-Al_2 O_3-SiO_2-H_2O为反应原料，在90℃下反应24 h以上，可使斜发沸石细颗粒生长并相互固定，（2）通过改变斜发沸石的组成，（主要是SiO_2/Al_2O_3），（3）通过与碳酸钠共沉积，可以在电极上沉积非常细的蛋白石-CT粉末，具有较大粒径的石灰玻璃粉，其易于通过EPD沉积。如上所述，本研究证明了由天然矿物制备高性能吸附材料的可能性。