The aim of this work is to investigate the biosorption of Cu(II) by an acidified waste product from the alginate extraction of algae in batch system and fixed bed columns. The results showed that the maximum copper biosorption capacity verified for the acidified biosorbent at 313 K was 3.580 mmol g^–1 and equilibrium isotherms were best described by the Dubinin–Radushkevich model. Thermodynamic analysis showed that the process presented positive values of biosorption enthalpy (22.91 kJ mol^–1) and biosorption entropy (114.98 J mol^–1 K^–1), indicating that the process is endothermic with dissociative mechanisms. Fixed bed experiments provided a higher percentage removal of copper at the feed flow rate of 0.5 mL min^–1 and the inlet concentration of 1.0 mmol L^–1. Column data were best described by the Yan et al. model. Copper desorption was performed using four different eluents. Among the eluents, HNO₃ presented the highest value of elution efficiency in batch system.

中文翻译：

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酸化藻类废物生物质对铜的分批和固定床生物吸附

这项工作的目的是研究分批系统和固定床色谱柱中藻类藻酸盐提取物中酸化废品对Cu（II）的生物吸附。结果表明，经酸化的生物吸附剂在313 K下验证的最大铜生物吸附容量为3.580 mmol g ^–1，并且用Dubinin–Radushkevich模型可以最好地描述平衡等温线。热力学分析表明，该过程呈现出生物吸附焓（22.91 kJ mol ^–1）和生物吸附熵（114.98 J mol ^–1 K ^–1）的正值，表明该过程是吸热的，具有解离机理。固定床实验以0.5 mL min ^–1的进料流速提供了更高百分比的铜去除率入口浓度为1.0 mmol L ^–1。Yan等人最好地描述了色谱柱数据。模型。使用四种不同的洗脱液进行铜的解吸。在洗脱液中，HNO ₃在间歇系统中的洗脱效率最高。