ArticleACS sustainable chemistry & engineering2025
Controlling Selectivity of Surface Electro-Precipitation (SEP) in the Recovery of Rare Earth Elements (REE) from Aqueous Feedstocks.
Article in ACS sustainable chemistry & engineering, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
SEP is an emerging green separation technique for the recovery of REE and other valuable elements from unconventional feedstocks. Its industrial adoption requires comprehensive mechanistic knowledge of its selectivity for REE vs typical background cations to achieve the desired separation. To bridge this gap, we experimentally studied SEP of neodymium Nd in chloride, nitrate, and sulfate solutions, in the absence and presence of calcium, aluminum, iron, zinc, and cobalt. We found that SEP is nonselective in the mass-transfer regime. It becomes selective in the mixed regime, with higher purification factors for elements with larger gaps in precipitation pH. At the same potential and initial pH, the selectivity of SEP in the mixed regime is controlled by the current (OH
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