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首页> 外文期刊>RSC Advances >Adsorption of Cu(II) ions in aqueous solution by aminated lignin from enzymatic hydrolysis residues
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Adsorption of Cu(II) ions in aqueous solution by aminated lignin from enzymatic hydrolysis residues

机译：胺化木质素从酶解残留物中吸附水溶液中的Cu（II）离子

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Aminated lignin (AL) has been prepared by a Mannich reaction for the removal of Cu(II) ions from aqueous solution. Effects of pH, reaction temperature, reaction time and the initial concentration of Cu(II) ions on the adsorption capacity were investigated. The structure and properties of AL were analyzed by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy analysis (SEM), and X-ray photoelectron spectroscopy analysis (XPS). Adsorption kinetic and isotherm models were used to illustrate the adsorption behaviors of AL. AL was more effective than enzymatic hydrolysis residues (EHR) and separated lignin (SL) in removing Cu(II) ions in aqueous solution. The adsorption capacity of AL for Cu(II) ions was better in near-neutral pH. Under the optimum adsorption conditions, the adsorption capacity of AL could reach up to 37.14 mg g?1. The pseudo-second-order model fitted the kinetic data well. The adsorption isotherm was well described by the Langmuir isotherm model. AL exhibited a good adsorption performance for recovery after three cycles. AL could be utilized as a kind of promising feedstock for high value-added products to remove Cu(II) ions in wastewater effectively.
机译：通过曼尼希反应制备了胺化木质素（AL），用于从水溶液中去除Cu（ II ）离子。研究了pH，反应温度，反应时间和Cu（ II ）离子初始浓度对吸附容量的影响。通过傅立叶变换红外光谱（FT-IR），扫描电子显微镜分析（SEM）和X射线光电子能谱分析（XPS）分析了铝的结构和性质。吸附动力学和等温线模型用来说明铝的吸附行为。 AL在去除水溶液中的Cu（ II ）离子方面比酶水解残留物（EHR）和分离的木质素（SL）更有效。在近中性pH下，AL对Cu（ II ）离子的吸附能力更好。在最佳吸附条件下，AL的吸附量可达37.14 mg g ？1 。拟二阶模型很好地拟合了动力学数据。 Langmuir等温线模型很好地描述了吸附等温线。在三个循环后，AL表现出良好的吸附性能以进行回收。铝可作为一种有前途的原料，用于高附加值产品，可有效去除废水中的Cu（ II ）离子。

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