The goal of this work was to study the viability of the application of biosorption using the brown alga in the recovery of scandium from red mud. The highest affinity of the biosorbent for scandium and aluminium was at pH 3. Sorption isotherms fitted to the Langmuir model for scandium and aluminium with adsorption capacities as high as 1.04 mmol·g for both metals but with higher affinity for scandium than for aluminium. The performance of the biomass in fixed-bed columns was evaluated in different experimental conditions (flow rate, bed height and inlet metal concentration). Metal desorption was achieved with different inorganic and organic acids. After three consecutive sorption–desorption cycles using 0.1 N citric acid and deionized water during the regeneration step, the brown alga showed a progressive increase in scandium uptake due to the cross-linking citric acid and the alginate chains. The biomass was characterized before and after biosorption using Fourier transforms infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) coupled with an energy dispersive elemental analyser (EDS). The sorption involves different functional groups, such carboxylate and sulphonic groups by chelation and electrostatic interactions.

中文翻译：

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使用藻类墨角藻选择性生物吸附和回收钪


这项工作的目的是研究使用褐藻生物吸附从赤泥中回收钪的可行性。生物吸附剂对钪和铝的最高亲和力在 pH 3 时。钪和铝的吸附等温线符合 Langmuir 模型，对两种金属的吸附容量高达 1.04 mmol·g，但对钪的亲和力高于对铝的亲和力。在不同的实验条件（流速、床高度和入口金属浓度）下评估固定床柱中生物质的性能。使用不同的无机酸和有机酸实现金属解吸。在再生步骤中使用 0.1 N 柠檬酸和去离子水进行三个连续吸附-解吸循环后，由于柠檬酸和藻酸盐链的交联，褐藻的钪吸收量逐渐增加。使用傅里叶变换红外（FTIR）光谱和扫描电子显微镜（SEM）结合能量色散元素分析仪（EDS）对生物吸附前后的生物质进行表征。吸附涉及不同的官能团，例如通过螯合和静电相互作用的羧酸根和磺酸基。