Abstract The sorption behavior of Sc(III) on oxidized carbon nanotubes (CNTs) for the separation and preconcentration of trace amounts of scandium ions from aqueous solutions was investigated. The mechanism of separation and the effects of pH, flow rate, sample volume and interferences, with special focus on calcium, on the recovery of Sc were systematically studied and optimized. Generally, the sorption of scandium increases with increasing pH. For pH in the range of 2.5–5.5 the sorption of Sc(III) onto CNTs is quantitative, but its removal in the pH range of 1–3.5 is mainly attributed to sorption, while at pH > 4 there is overlap with the precipitation curve, indicating insignificant sorption. The adsorbed amount of Sc(III) at pH 2.0 was 42.0 mg g− 1. The procedure was applied to the enrichment of scandium with ICP-OES detection for natural water analysis with a preconcentration factor of 250 and a detection limit (3σ) of 0.05 μg L− 1.

中文翻译：

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钙基体存在下碳纳米管富集钪

摘要 研究了 Sc(III) 在氧化碳纳米管 (CNT) 上的吸附行为，用于从水溶液中分离和预浓缩痕量钪离子。系统研究和优化了分离机理以及 pH、流速、样品体积和干扰物（特别是钙）对 Sc 回收率的影响。通常，钪的吸附量随着 pH 值的增加而增加。对于 2.5-5.5 范围内的 pH 值，Sc(III) 在 CNT 上的吸附是定量的，但其在 1-3.5 的 pH 范围内的去除主要归因于吸附，而在 pH > 4 时与沉淀曲线重叠，表明吸附不显着。在 pH 2.0 时，Sc(III) 的吸附量为 42.0 mg g-1。