Solar-powered bioelectrochemical system for efficient cadmium remediation and recovery of reusable solids.
AI summary
100% confidenceA solar-powered bioelectrochemical system (PV-BES) was developed for efficient cadmium remediation, achieving 62.3% removal of dissolved Cd2+ ions, outperforming a self-biased microbial fuel cell. The system's efficiency is attributed to localized interfacial alkalization, which favors the formation of crystalline Cd-O solids rather than metallic Cd plating. This approach provides a sustainable, low-energy pathway for heavy metal remediation under mild aqueous conditions.
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Abstract
Cadmium (Cd) is a persistent industrial pollutant that poses severe environmental risks, necessitating remediation technologies that balance efficiency with energy sustainability. This study investigates a solar-powered bioelectrochemical system (PV-BES) as a low-energy strategy for Cd recovery, addressing limitations associated with conventional energy-intensive processes. In batch experiments, the PV-BES achieved 62.3% removal of dissolved Cd 2+ , outperforming the 53.8% efficiency of a self-biased microbial fuel cell. Electrochemical measurements combined with solid-phase characterization indicate that the solar-driven bias is consistent with localized interfacial alkalization, which favors the formation of crystalline Cd-O solids rather than continuous metallic Cd plating under near-neutral bulk pH conditions. These results suggest that coupling photovoltaics with bioanodes provides a synergistic, reagent-free pathway for cadmium immobilization and recovery. Overall, this work supports the potential of PV-assisted BES as a sustainable, low-energy approach for heavy metal remediation under mild aqueous conditions.