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首页> 外文期刊>Advances in Environmental Technology >Cadmium removal from wastewater using nano-clay/TiO2 composite: kinetics, equilibrium and thermodynamic study
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Cadmium removal from wastewater using nano-clay/TiO2 composite: kinetics, equilibrium and thermodynamic study

机译：纳米粘土/ TiO2复合材料去除废水中的镉：动力学，平衡和热力学研究

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In this research, commercial nano-clay (NC) was modified with TiO2 functional groups and characterized via XRD and FTIR methods. The modified nano-clay was applied as an adsorbent for the removal of cadmium from wastewater solutions. The effects of the operating parameters including initial pH, cadmium concentration and adsorbent concentration were analyzed by the Taguchi method. The optimum conditions for cadmium removal by the nanoclay/TiO2 composite were an initial feed pH of 6, an initial concentration of 30 mg/L, and an adsorbent concentration of 4.5 g/L. Under these conditions, nearly 90% of the cadmium ions were removed by modified nano-clay after one hour. The equilibrium results showed that the Freundlich model could well fit the experimental data, and this indicated the multilayer adsorption process. The adsorption capacity of the nano-clay for cadmium improved from 8.92 mg/g to 16.20 mg/g by modification with TiO2. The kinetic data were analyzed using the pseudo-first order, pseudo-second-order, and intraparticle kinetics models. Thermodynamic studies indicated the exothermic and spontaneously nature of the adsorption process.
机译：在这项研究中，用TiO2官能团修饰了商用纳米粘土（NC），并通过XRD和FTIR方法对其进行了表征。改性的纳米粘土被用作吸附剂，用于从废水溶液中去除镉。使用Taguchi方法分析了包括初始pH值，镉浓度和吸附剂浓度在内的操作参数的影响。通过纳米粘土/ TiO2复合材料去除镉的最佳条件是初始进料pH为6，初始浓度为30 mg / L，吸附剂浓度为4.5 g / L。在这些条件下，一小时后，将近90％的镉离子被改性的纳米粘土去除。平衡结果表明，Freundlich模型可以很好地拟合实验数据，这表明了多层吸附过程。通过用TiO 2改性，纳米粘土对镉的吸附能力从8.92 mg / g提高到16.20 mg / g。使用伪一级，伪二级和粒子内动力学模型分析动力学数据。热力学研究表明了吸附过程的放热性和自发性。

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