Fly ash based geopolymer for heavy metal removal: A case study on copper removal
Fly ash based geopolymer for heavy metal removal: A case study on copper removal
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DOI：
10.1016/j.jece.2015.06.005
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发表时间：
2015-09-01
影响因子：
7.7
通讯作者：
Mahasneh, Mehaysen
中科院分区：
文献类型：
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作者：
Al-Harahsheh, Mohammad S.;Al Zboon, Kamel;Mahasneh, Mehaysen
这项工作旨在评估由废粉煤灰合成的无定形地质聚合物作为水溶液中铜吸附剂的有效性。由于飞灰玻璃相的溶解，所获得的地质聚合物在结构上具有高度无定形性。与原粉煤灰相比，其去除效率要高得多。去除效率受固液比、温度、反应时间和Cu2+初始浓度(C-0)的影响。在 pH 6 时获得最高的 Cu2+ 去除能力。发现动力学数据符合伪二级动力学模型。此外，发现在温度范围（25-45℃）内，Langmuir模型优于Freundlich模型。最大吸附容量 (q(m)) 出现在 45°C 时，达到 152 mg/g 的值。所得地质聚合物的吸附过程本质上是吸热的，在较高温度下更有利，吸附焓为 39.49 kJ/mol。最佳条件下吸附过程的活化能为34.9 kJ/mol。 (C) 2015 Elsevier Ltd. 保留所有权利。
This work aims to evaluate the effectiveness of an amorphous geopolymer, synthesized from waste fly ash, as sorbent material for copper from aqueous solutions. The obtained geopolymer was found to be highly amorphous in structure due to the dissolution of fly ash glass phases. It has much higher removal efficiency compared to the raw fly ash. The removal efficiency was affected by solid/liquid ratio, temperature, reaction time, and Cu2+ initial concentration (C-0). The highest Cu2+ removal capacity was obtained at pH 6. The kinetic data were found fit to the pseudo second order kinetic model. Furthermore, it was found that Langmuir model is better than Freundlich model within the temperature range (25-45 degrees C). The maximum sorption capacity (q(m)) occurred at 45 degrees C, reaching a value of 152 mg/g. The sorption process by the obtained geopolymer is endothermic in nature and more favorable at higher temperatures with enthalpy of adsorption of 39.49 kJ/mol. The activation energy of the sorption process at the optimum conditions was found to be 34.9 kJ/mol. (C) 2015 Elsevier Ltd. All rights reserved.