The Creation of Oxidative Transfer Fluorination Contributing to Mineralization of Environmentally Persistent Fluorinated Organic Compounds

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K15328
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 34030:Green sustainable chemistry and environmental chemistry-related
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Shimoyama Yoshihiro 国立研究開発法人産業技術総合研究所, 材料・化学領域, 研究員 (70859082)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: コアシェル構造 / PFOA代替基質 / テトラフルオロホウ酸イオン / パラジウム / セリウム / 逐次含浸法

Outline of Final Research Achievements

SiO2 supported by sequential impregnation of palladium and cerium oxides was prepared as a catalyst. TEM measurements showed that a core-shell structure with Pd as the nucleus and CeOx as the shell was formed on the SiO2. In the presence of persulfate, BF4 ion was produced from B(OH)3 in the oxidative degradation of PFOA alternative substrate, and F ion was produced by the decomposition. In addition, catalytic oxidation of pentafluorophenylsulfonate was carried out using hydrogen peroxide as an sacrificial oxidant, and the conversion yields and the yields of fluorinated compounds were determined. As a result, except for cerium, it was found that the substrate conversion yields and the yields of tetrafluoroborate ion tended to improve as the elemental number of the added rare earth increased.

Free Research Field

無機・錯体化学

Academic Significance and Societal Importance of the Research Achievements

パーフルオロアルキルスルホン酸(PFAS)等は、その安定性に基づき、環境中で分解を受けずに半永久的に堆積する。PFASは通例の分解処理法では厳しい条件を必要とし、分解が進行しても有害なフッ化物イオンが生成し、環境・人体に対して依然として重篤な悪影響をもたらしうる。そこで希土類金属や貴金属の特異な反応性を利用することで、より温和な条件で分解することが可能になり、また生成するフッ化物イオンを他の化合物に付加させることで、有害物から有価物への変換をワンポットで行うことができる。セリウムは希土類元素の中でも安価なため、大スケール反応への展開も見据えることが可能である。