Florian Auras

Dec 30, 2024 | nature.com | Florian Auras |Ataf Ali Altaf |Amin Zarei |Saeed Amirjalayer |Alireza Abbaspourrad |Amin Zadehnazari | +1 more

The rising demand for gold requires innovative methods for its recovery from e-waste. Here we present the synthesis of two tetrazine-based vinyl-linked covalent organic frameworks: TTF-COF and TPE-COF that adsorb gold ions and nanoparticles and catalyze the carboxylation of terminal alkynes. These covalent organic frameworks have low band gaps and high photocurrent responses. TTF-COF has an adsorption capacity toward aqueous Au(III) of 2440 mg g–1, and TPE-COF’s Au(III) adsorption capacity is 1639 mg g–1. The gold source is metal flakes isolated from waste computer processing units. Of the gold present, > 99% is selectively captured by TTF-COF whereas only 5% of the Ni and 2% of the Cu in the solution is adsorbed. The Au-loaded covalent organic frameworks catalyze the carboxylation of terminal alkynes and are stable and reusable for six reuse cycles. Our covalent organic frameworks convert e-waste into a valuable catalyst for a useful green organic transformation. The rising demand for gold requires innovative methods for its recovery from e-waste. Here, the authors describe tetrazine-linked covalent organic frameworks loaded with recovered gold from mixed metal e-waste which serve as efficient, reusable catalysts for CO2 carboxylation of alkynes.

May 3, 2024 | nature.com | Florian Auras |Volodymyr Bon |Simon M. Vornholt |Simon Krause |Karena Chapman |Stefan Kaskel | +1 more

AbstractPorous covalent organic frameworks (COFs) enable the realization of functional materials with molecular precision. Past research has typically focused on generating rigid frameworks where structural and optoelectronic properties are static. Here we report dynamic two-dimensional (2D) COFs that can open and close their pores upon uptake or removal of guests while retaining their crystalline long-range order.

Jan 26, 2024 | nature.com | Shuai Yuan |Linjie Dai |Yuqi Sun |Florian Auras |Yun Liu |Cathal Cassidy | +10 more

AbstractPerovskite light-emitting diodes (LEDs) show promises for next-generation displays owing to their excellent luminescent properties and low cost. Despite substantial progress with green- and red-emitting devices, the development of efficient blue perovskite LEDs has lagged behind.