| 1. |
- Wu, Zheng, et al.
(author)
-
Solar Thermal Swing Adsorption on Porous Carbon Monoliths for High-performance CO2 Capture
- 2023
-
In: Nano Research. - : Springer. - 1998-0124 .- 1998-0000. ; 16:7, s. 10617-10625
-
Journal article (peer-reviewed)abstract
- Utilizing solar energy for sorbent regeneration during the CO2 swing adsorption processes could potentially reduce CO2 capture costs. This study describes a new technique−solar thermal swing adsorption (STSA) for CO2 capture based on application of intermittent illumination onto porous carbon monolith (PCM) sorbents during the CO2 capture process. This allows CO2 to be selectively adsorbed on the sorbents during the light-off periods and thereafter released during the light-on periods due to the solar thermal effect. The freestanding and mechanically strong PCMs have rich ultramicropores with narrow pore size distributions, displaying relatively high CO2 adsorption capacities and high CO2/N2 selectivities. Given the high CO2 capture performance, high solar thermal conversion efficiency and high thermal conductivity, the PCM sorbents could achieve high CO2 capture rate of up to 0.226 kgCO2 kgcarbon−1 h−1 from a gas mixture of 20v% CO2/80v% N2 under STSA conditions with a light intensity of 1,000 W m−2. In addition, the combination of STSA with the conventional vacuum swing adsorption technique further increases the CO2 working capacity.
|
|
| 2. |
- Xu, Qinqin, et al.
(author)
-
Gold recovery from E-waste using freestanding nanopapers of cellulose and ionic covalent organic frameworks
- 2023
-
In: Chemical Engineering Journal. - : Elsevier. - 1385-8947 .- 1873-3212. ; 458, s. 1-8
-
Journal article (peer-reviewed)abstract
- The ever-increasing production of electronic devices generates a huge amount of electronic waste (E-waste). Therefore, there is an urgent need for advanced recycling technology for E-waste that provides both economic and environmental benefits. Herein, we describe the preparation of flexible, freestanding CF-COF nanopapers consisting of cellulose fibers (CFs) and guanidinium-based ionic covalent organic framework (COF) that can be used for recovering gold from E-waste leaching solutions via a membrane separation technique. Due to the synergetic effects of physical adsorption, ion exchange and chemical reduction, the COF has an extremely high capture capacity (up to 1,794 mg of Au per gram of COF), is highly selective and has fast kinetics for adsorbing trace amounts of [AuCl4]− in aqueous solution. The high COF loadings (∌50 wt%) and hierarchical porosity of the CF-COF nanopapers resulted in excellent performance when capturing gold species from the E-waste leaching solution. This study provides new possibilities for developing sustainable membrane materials, and highly efficient and cost-effective techniques for the recovery of precious metals from E-waste.
|
|
