Digital waste (e-waste) has turn into one of many fastest-growing stable waste streams globally, with most e-waste containing important portions of high-value but environmentally hazardous substances, notably noble metals exemplified by gold (Au). These parts not solely pose potential threats to the atmosphere and human well being but in addition exhibit substantial financial worth. Thus, the environment friendly and eco-friendly restoration of noble metals from e-waste can concurrently mitigate environmental air pollution and generate important financial advantages. On this work, silicon—the second most ample and cost-effective factor within the Earth’s crust—was utilized to synthesize two-dimensional silicon nanosheets (SiNSs) able to extremely environment friendly gold ion extraction. The SiNSs demonstrated distinctive extraction capacities (as excessive as 1500 mg Au per gram of SiNSs) at low concentrations (10 ppm). The redox-mediated mechanism governing Au extraction exhibited decrease power barrier than conventional chemisorption. Moreover, a continuous-flow extraction system was engineered, during which SiNSs membranes maintained exceptional extraction efficiency even for ultralow-concentration Au ions (100 ppb).
