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About the Cover:On the cover: A nano-iron reactor is applied to recover silver from aqueous solution. Experimental results demonstrate that nanoscale zero-valent iron could sequester Ag+ (ca. 1 mg/L) and be transformed into high-grade (32.0 mg/g) silver “ore”, with valuable silver nanoparticles produced. The performance of the “reaction- separation-reuse” system can be easily regulated with the oxidation reduction potential in reaction zone. [Zhang, Wei-xian et al. on page 991-997.]
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