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首页> 美国卫生研究院文献>Scientific Reports >Selected Heavy Metals Removal From Electroplating Wastewater by Purified and Polyhydroxylbutyrate Functionalized Carbon Nanotubes Adsorbents
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Selected Heavy Metals Removal From Electroplating Wastewater by Purified and Polyhydroxylbutyrate Functionalized Carbon Nanotubes Adsorbents

机译：纯化和聚羟基丁酸酯官能化碳纳米管吸附剂从电镀废水中去除某些重金属的选择

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This research investigated the removal of heavy metals (As, Pb, Cr, Cd, Ni, Cu, Fe, and Zn) via batch adsorption process from industrial electroplating wastewater using two different nano-adsorbents; purified carbon nanotubes (P-CNTs) and polyhydroxylbutyrate functionalized carbon nanotubes (PHB-CNTs), both produced through catalytic chemical vapour deposition (CCVD) method. HRSEM, HRTEM, XRD, DLS, BET, FTIR, XPS, TGA, pH drift and Raman spectroscopy were used to characterize the developed nano-adsorbents. In the batch adsorption process, the effects of contact time, dosage, temperature and pH were studied. Both nano-adsorbents gave optimum contact time, equilibrium time, optimum dosage, and pH of 10 minutes, 70 minutes, 20 mg, and 5.63–5.65 respectively. The heavy metals removal efficiencies by the nano-adsorbents followed the order of PHB-CNTs > P-CNTs based on ion exchange and electrostatic forces mechanism. For P-CNTs and PHB-CNTs, the equilibrium sorption isotherm suits temkin model, kinetic data fitted to pseudo-second order based on the linear regression correlation coefficient, and the thermodynamic study established spontaneity and endothermic nature of the adsorption process. The findings in this research conclude that both nano-adsorbents have exceptional capacity to remove heavy metals from the adsorbate, with PHB-CNTs possessing better quality. The treated adsorbate meets the standard for industrial or irrigation re-use.
机译：本研究研究了使用两种不同的纳米吸附剂通过间歇吸附法从工业电镀废水中去除重金属（As，Pb，Cr，Cd，Ni，Cu，Fe和Zn）的方法。纯化的碳纳米管（P-CNT）和聚羟基丁酸酯官能化的碳纳米管（PHB-CNT），均通过催化化学气相沉积（CCVD）方法生产。 HRSEM，HRTEM，XRD，DLS，BET，FTIR，XPS，TGA，pH漂移和拉曼光谱被用来表征已开发的纳米吸附剂。在间歇吸附过程中，研究了接触时间，剂量，温度和pH值的影响。两种纳米吸附剂的最佳接触时间，平衡时间，最佳剂量和pH分别为10分钟，70分钟，20 mg和5.63–5.65。基于离子交换和静电力机理，纳米吸附剂对重金属的去除效率遵循PHB-CNTs> P-CNTs的顺序。对于P-CNT和PHB-CNT，平衡吸附等温线适合temkin模型，基于线性回归相关系数将动力学数据拟合为伪二级，热力学研究确定了吸附过程的自发性和吸热性。这项研究的发现得出结论，两种纳米吸附剂均具有从吸附物中去除重金属的出色能力，PHB-CNT具有更好的质量。处理过的吸附物符合工业或灌溉重复使用的标准。

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