Basic technology for fabrication of large-scale porous absorbent for wide-area environmental remediation

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K12303
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 64030:Environmental materials and recycle technology-related
• Research Institution: Akita University
• Principal Investigator: Hayashi Shigeo 秋田大学, 理工学研究科, 教授 (20218572)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 環境浄化材料 / 天然ゼオライト / イオン吸着 / 電気泳動堆積法 / ジオポリマー法 / 堆積膜 / 固定化 / 耐剥離性

Outline of Final Research Achievements

In order to prepare porous and integrated adsorbent materials that can be used for wide-area environmental remediation, we attempted to prepare deposition and immobilization membranes of natural zeolite powder using the electrophoretic deposition (EPD) and geopolymer methods, and investigated means to improve the exfoliation resistance of the prepared membranes.
The effects of metakaolin from different raw materials as an immobilization accelerator were compared, and the effects of the type of impurity (with or without kaolin minerals) on the EPD deposition rate and the delamination resistance of the films were clarified. It was also shown that unburned kaolin outperforms metakaolin in terms of EPD deposition rate and film peeling resistance. Furthermore, the “undried method,” in which the deposited film is immobilized without drying after EPD, was found to be effective in preventing the detachment of the deposited film during immobilization.

Free Research Field

無機材料工学

Academic Significance and Societal Importance of the Research Achievements

学術的意義としては，高温による焼結が困難な無機物質である天然ゼオライト粉末の堆積・固定化膜を，エネルギー消費の少ない電気泳動堆積（EPD）法ならびにジオポリマー法によって作製するための手法を様々な方面から検討し，作製した膜の耐剥離性を従来より大きく向上させることができた点が挙げられる。
また社会的意義としては，環境中の汚染物質を高効率で吸着除去することができる大型で一体型の多孔質吸着剤を作製するための基礎技術について検討し，河川・湖沼などにおいて従来より広い領域において汚染物質を高効率に吸着・除去する環境浄化を行うための新しい技術の開発に貢献することができた点が挙げられる。