Development of a homogeneous/heterogeneous metal recovery system based on reversible association/dissociation between tris(2-aminoethyl)amine and 1,4-bis(hexafluoro-α-hydroxyisopropyl)benzene
Abstract We developed a novel metal recovery system that facilitates homogeneous coordination for metal recovery and then becomes heterogeneous, allowing separation after the recovery, based on reversible association/dissociation between tris(2-aminoethyl)amine (denoted as tren) and 1,4-bis(hexafluoro-α-hydroxyisopropyl)benzene (1,4-bisHFAB). Metal solution containing the tren/1,4-bisHFAB association complex is homogeneous at high temperature due to the scission of hydrogen bonds, which results in efficient coordination of tren to the metal ions. After coordination, the solution is heterogenized by cooling, which results in the regeneration of hydrogen bonds, and the mixture can be separated by filtration. The recovery behavior of Pd(OAc) 2 and CuBr(PPh 3 ) 3 using this system was examined, and the recovery efficiencies were found to be high (Pd II : 100% and Cu I : 100%). The system also allowed the recovery of Pd(OAc) 2 and CuBr(PPh 3 ) 3 catalysts after Suzuki-Miyaura coupling and Huisgen cycloaddition, respectively (Pd II : 100% and Cu I : 100%). Highlights Homogeneous coordination for metal recovery and then heterogeneous for separation. Recovery efficiencies of Pd II and Cu I were high (>99%). Recovery efficiency reached >99% even with a time of just 10s. Recovery of metal catalyst after Suzuki-Miyaura coupling and Huisgen cycloaddition. Graphical abstract [DISPLAY OMISSION]
유료 다운로드의 경우 해당 사이트의 정책에 따라 신규 회원가입, 로그인, 유료 구매 등이 필요할 수 있습니다. 해당 사이트에서 발생하는 귀하의 모든 정보활동은 NDSL의 서비스 정책과 무관합니다.
원문복사신청을 하시면, 일부 해외 인쇄학술지의 경우 외국학술지지원센터(FRIC)에서
무료 원문복사 서비스를 제공합니다.
NDSL에서는 해당 원문을 복사서비스하고 있습니다. 위의 원문복사신청 또는 장바구니 담기를 통하여 원문복사서비스 이용이 가능합니다.
- 이 논문과 함께 출판된 논문 + 더보기