Synthesis of novel adsorbents for cesium ion and development of a process for treating polluted water

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04755
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 27010:Transport phenomena and unit operations-related
• Research Institution: University of Hyogo
• Principal Investigator: Yamamoto Takuji 兵庫県立大学, 工学研究科, 教授 (30358288)
• Co-Investigator(Kenkyū-buntansha): 田口 翔悟 兵庫県立大学, 工学研究科, 助教 (40844270)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: イオン交換樹脂 / 吸着剤合成 / セシウムイオン / 固定層吸着

Outline of Final Research Achievements

First, we synthesized resorcinol-formaldehyde gel beads (RFGBs) with great adsorption capacity for cesium cation (Cs+), then we evaluated the adsorption performance of RFGBs in a packed bed for trapping aqueous Cs+. The target particle size of RFGBs was determined as 450 um based on the pressure drop when an aqueous solution of Cs+ was introduced by the gravity to the bed packed with uniform RFGBs of the size. Of the examined synthesis conditions, the effect of the viscosity of the resorcinol-formaldehyde (RF) solution as the starting material was found to be the greatest, and we could obtain the RFGBs with the target size by adjusting the viscosity of the RF solution. The RFGBs showed the greater adsorption performance than those reported in the previous study. The adsorption capacity of the bed packed with RFGBs was 51.1 mg-Cs+/g-RFGBs.

Free Research Field

単位操作（化学工学）

Academic Significance and Societal Importance of the Research Achievements

エネルギー安全保障の観点から脱原発は未だ困難であり、不安定な世界情勢を鑑みても更なる放射能汚染のリスクは拭えない状況が続いている。広範囲の土壌や水圏が汚染された場合の除去技術としては吸着が最も効果的な方法であり、安価で高機能な吸着剤の開発は今後ますます重要度を増すと考えられる。本研究成果は未だ小規模ながら、汚染水除去のための実用的な吸着剤とその使用方法を提案・実証するものであり、上で述べたような社会的要請に応えるものと考えている。