One-pot synthesis of cost-effective dual functional material from solid waste for integrated CO2 capture and utilization

Integrated CO 2 capture and utilization (ICCU) using dual-functional materials (DFMs) offers significant potential for achieving net-zero emissions by reducing the economic costs of CO 2 capture and utilization (CCU). This is accomplished by eliminating the need for temperature-swing processes and bypassing CO 2 compression and transportation steps. However, the current ICCU processes still face challenges related to high economic and energy costs. In this study, a novel method is proposed for synthesizing ICCU DFMs with enhanced CO 2 capture and conversion performance through the recycling of waste eggshells and waste printed circuit boards (PCBs). The synthesis method uniquely integrates metal extraction from waste PCBs and modification of waste eggshells in a single process using organic acid . The characteristics of the DFMs were thoroughly analyzed using techniques such as XRD , SEM, TEM , BET, ICP-OES, in-situ DRIFTS , and TGA . The ICCU performance of the DFMs was evaluated in a fixed-bed system, and a techno-economic analysis was conducted to assess the market viability. The results showed that the DFM derived from waste materials achieved a CO 2 capture capacity of 9.56 mmol/g, a CO 2 conversion of approximately 90 %, and near 100 % CO selectivity at 650 °C, significantly outperforming the raw eggshell benchmark (CO 2 capture capacity < 5.4 mmol/g, CO 2 conversion rate < 75 %). According to the techno-economic analysis, the DFM synthesized from waste materials demonstrated both excellent performance and a reduced production cost for CO in the current ICCU-RWGS process, facilitating the advancement of the ICCU-RWGS technology and contributing to sustainable development.