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Fishing for uranium﻿

The world’s oceans contain more than 4 billion metric tons of dissolved uranium, a reserve 1,000 times as great as terrestrial deposits. Scientists would like to tap this almost-limitless fuel supply for nuclear reactors, but uranium’s low concentration in seawater—just 3.3 ppb—makes it a formidable challenge to extract the valuable element. Researchers in China hope that some new fishing gear will help land this prize catch. Ning Wang at Hainan University and his colleagues have combined synthetic spider silk and a uranium-adsorbing protein to make strong threads with the highest uranium-uptake capacity of any fiber adsorbents tested in natural seawater. The material also works more quickly than previous systems, taking days rather than weeks to reel in its quarry (Angew. Chem., Int. Ed. 2019, DOI: 10.1002/anie.201906191). The ideal adsorbent should snag lots of uranyl ions in a short time and shun competing metal ions such as vanadyl (VO2+). It should