Metal removal by novel foam separation method in which ionic polymers are adsorbed on vesicle carriers

2024 Fiscal Year Final Research Report

• Project/Area Number: 22K05185
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: Saitama University
• Principal Investigator: Matsuoka Keisuke 埼玉大学, 教育学部, 准教授 (90384635)
• Project Period (FY): 2022-04-01 – 2025-03-31
• Keywords: 泡沫分離 / 界面活性剤 / セシウム / 除去速度

Outline of Final Research Achievements

The foam separation method can remove substances dissolved in a water solution by generating gas bubbles in a solution containing surfactants. We conducted research to improve the removal rate of Cs by adding polyacrylic acid with many ion functional groups to the foam separation system.　 When polyacrylic acid was added to the SDS system, it resulted in hindering the removal of Cs.　 On the other hand, in the diSLSS system that forms vesicles in aqueous solution, the adsorption of polyacrylic acid onto the vesicle surface increased the removal rate of Cs. The low molecular weight polyacrylic acid showed a slightly higher removal efficiency. Additionally, the effectiveness of polyacrylic acid decreases beyond proper concentration. The addition of ionic polymers showed to affect metal removal depending on the combination with surfactants. Developing foam separation methods is expected to be one of the approaches to solving environmental problems.

Free Research Field

界面化学

Academic Significance and Societal Importance of the Research Achievements

泡沫分離は水に溶解している物質を吸着除去できる数少ない方法であるが、時間を要することが欠点である。多数の吸着サイトをもつイオン官能基をもつポリアクリル酸ポリマーを界面活性剤とともに汚水に添加して、Csの除去速度を増加させる研究を行った。ポリマー分子の性質上、表面への吸着に有利でないため、一般的な界面活性剤（SDS）と併用した場合、効果が高くないことが判明した。そこで、水溶液中でベシクル形成をする界面活性剤（Disodium lauryl sulfosuccinate）を用いて、粒子間にポリマーを吸着させることで、除去速度が増加することを確かめた。