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首页> 外文期刊>Journal of Encapsulation and Adsorption Sciences >Synthesized Goethite and Natural Iron Oxide as Effective Absorbents for Simultaneous Removal of Co(II) and Ni(II) Ions from Water
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Synthesized Goethite and Natural Iron Oxide as Effective Absorbents for Simultaneous Removal of Co(II) and Ni(II) Ions from Water

机译：合成针铁矿和天然氧化铁可有效去除水中的Co（II）和Ni（II）离子

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This study reports on the adsorption efficiency of a natural iron oxide from Mballam-Cameroon in comparison with synthesized goethite to simulta-neously remove cobalt and nickel ions from aqueous solutions. Chemical analysis on the natural iron oxide sample revealed iron as the main element and hematite (58.52%) goethite (19.42%), kaolinite (12.69%) and quartz (7.79%) as the component phases in the iron oxide sample. The iron oxide was found to be microporous (BET surface area 43.27 m ~(2) /g) with fairly spherical polydisperse particles. Results show maximum absorption for Co(II) and Ni(II) ions for both adsorbents occurred at an equilibrium contact time of 80 mins, dose rate of 0.1 g/L, and pH = 7. Goethite was slightly more efficient at removing target metal ions with maximal adsorbed quantities at 117.8 mg/g of Co(II) and 100.6 mg/g of Ni(II), and 103.9 mg/g of Co(II) and 85.2 mg/g of Ni(II) ions for natural iron oxide. Equilibrium modelling presented the Freundlich isotherm as the best fit model for both adsorbents and metal ions, indicating heterogeneity of the surface binding sites during adsorption. The pseudo-second order kinetic model was the best-fit model, indicating chemical adsorption between the adsorbent surface and metal ions, hence a good correlation between equilibrium and kinetics. The findings indicate that the efficacy of the natural iron oxide from Mballam is almost equivalent to that of synthetic goethite, validating its applicability for the simultaneous removal of cobalt and nickel ions from aqueous solution.
机译：这项研究报告了与合成针铁矿相比，姆巴拉姆-喀麦隆的天然氧化铁从水溶液中同时去除钴和镍离子的吸附效率。对天然氧化铁样品的化学分析显示，铁是主要元素，赤铁矿（58.52％）针铁矿（19.42％），高岭石（12.69％）和石英（7.79％）是氧化铁样品的组成相。发现氧化铁为微孔状（BET表面积为43.27 m〜（2）/ g），具有相当球形的多分散颗粒。结果表明，两种吸附剂对Co（II）和Ni（II）离子的最大吸收均发生在80分钟的平衡接触时间，0.1 g / L的剂量率和pH = 7的条件下。针铁矿去除目标金属的效率略高天然铁的最大吸附量为117.8 mg / g的Co（II）和100.6 mg / g的Ni（II），103.9 mg / g的Co（II）和85.2 mg / g的镍离子氧化物。平衡模型表明Freundlich等温线是吸附剂和金属离子的最佳拟合模型，表明吸附过程中表面结合位点的不均一性。拟二级动力学模型是最佳拟合模型，表明吸附剂表面与金属离子之间存在化学吸附，因此平衡与动力学之间具有良好的相关性。研究结果表明，来自Mballam的天然氧化铁的功效几乎与合成针铁矿的功效相当，这证明了其在从水溶液中同时去除钴和镍离子的适用性。

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