Gold recovery at ultra-high purity from electronic waste using selective polymeric film
발표자
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초록
내용
Gold (Au) is extremely valuable in a variety of areas; however, its inadequacy increases the desire to recover it from any possible source, such as virgin mines and electronic waste (e-waste). Here we propose a sustainable Au recovery technology from e-waste with high purity and probe recyclability, which is established on selective 1:1 coordination-based colorimetric probes immobilized on the surface of a quartz substrate to form a thin polymeric film (F1). The presence of Au(III) in various e-waste samples was determined via the color changes from yellow to brick-red of F1, and this is used to decide if further Au recovery is lucrative. Thereafter, trace amounts of Au at ultra-high purity (23.97 K) are rapidly recovered (in 10 min) even with approximately 100-fold excess of other metal ions (copper and nickel) commonly found in e-waste without the use of harsh acids, bases, or toxic methods. Au(III)-liberated F1 can be used to further separate Au(III), and this process was repeated for multiple cycles.