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Simultaneous biosorption of nickel and cadmium by the brown algae Cystoseria indica characterized by isotherm and kinetic models
Applied Biological Chemistry ( IF 3.2 ) Pub Date : 2019-11-15 , DOI: 10.1186/s13765-019-0477-6
Mohammad Khajavian , David A. Wood , Ahmad Hallajsani , Nasrollah Majidian

Biosorption is an effective way of extracting heavy metal ions from aqueous solutions of various compositions. The brown algae, Cystoseria indica, when treated with sodium chloride, demonstrates significant capacity to extract cadmium and nickel, simultaneously, from aqueous solutions. The batch system was running over wide ranges of initial metal ion concentrations (5–150 mg/L), pH (2–6), adsorbent mass (1–4 g/L), and contact times (20–300 min), at a temperature of 25 °C. The results obtained when applying the system in these conditions exhibit higher removal capacities for cadmium than nickel. The optimal conditions of the biosorption process were found as the adsorbent mass of 1 g/L, initial concentration of adsorbates of 100 mg/L and pH of 6. The equilibrium data obtained are better described by the extended-Freundlich isotherm for nickel and cadmium. The maximum biosorption of nickel and cadmium in binary-metal-component system were 18.17 and 55.34 mg/g, respectively. The kinetic data derived from these experiments were evaluated with pseudo-first-order, pseudo-second-order and intra-particle-diffusion kinetic models. Kinetic examination of the equilibrium data derived from these models suggest that the adsorption of nickel and cadmium both follow the intra-particle-diffusion kinetic model.

中文翻译:

等温线和动力学模型表征褐藻Cy藻同时吸附镍和镉。

生物吸附是从各种组成的水溶液中提取重金属离子的有效方法。当用氯化钠处理褐藻(Cystoseria indica)时,它具有从水溶液中同时提取镉和镍的显着能力。该批处理系统的初始金属离子浓度(5-150 mg / L),pH(2-6),吸附剂质量(1-4 g / L)和接触时间(20-300分钟)的范围很广,在25°C的温度下。在这些条件下使用该系统时获得的结果显示出比镍更高的镉去除能力。发现生物吸附过程的最佳条件是:吸附剂质量为1 g / L,吸附物的初始浓度为100 mg / L,pH为6。镍和镉的扩展-弗氏等温线可以更好地描述获得的平衡数据。二元金属组分系统中镍和镉的最大生物吸附分别为18.17和55.34 mg / g。这些实验得出的动力学数据用伪一级,伪二级和粒子内扩散动力学模型进行了评估。从这些模型得出的平衡数据的动力学研究表明,镍和镉的吸附均遵循颗粒内扩散动力学模型。
更新日期:2019-11-15
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