Faculty of Physics, Semnan University, P.O. Box: 35195-363, Semnan, Iran.
Sci Rep. 2023 Apr 15;13(1):6131. doi: 10.1038/s41598-023-33266-0.
Alumina (AlO) nanoparticles (NPs) are particularly adsorbent NPs with a high specific surface area (SSA) that may well be utilized to clean water. In this study, pure γ-alumina NPs are successfully synthesized by the co-precipitation method, and the effect of ammonium bicarbonate concentration on the synthesized NPs is studied to find the optimum concentration to provide the highest capacity of copper ions removal from water. The results declare that spherical alumina NPs with average diameters in the range of 19-23 nm are formed with different concentrations of precipitation agent, and the concentration has no significant effect on the morphology of NPs. Furthermore, the precipitating agent concentration influences the optical characteristics of the produced alumina NPs, and the bandgap energies of the samples vary between 4.24 and 5.05 eV. The most important impact of precipitating agent concentrations reflects in their SSA and capacity for copper ion removal Ultra-high SSA = 317 m/g, and the highest copper removal at the adsorbate concentration of 184 mg/L is achieved in an alkalis solution followed by a neutral solution. However, admirable copper removal of 98.2% is even achieved in acidic solutions with 0.9 g/L of the alumina NPs synthesized at a given concentration of ammonium bicarbonate, so this sample can be a good candidate for Cu ions removal from acidic wastewater.
氧化铝（AlO）纳米颗粒（NPs）是一种特别具有吸附性的 NPs，具有高比表面积（SSA），可用于清洁水。在本研究中，通过共沉淀法成功合成了纯γ-氧化铝 NPs，并研究了碳酸氢铵浓度对合成 NPs 的影响，以找到提供从水中去除铜离子的最高容量的最佳浓度。结果表明，形成了具有不同沉淀剂浓度的球形氧化铝 NPs，平均直径在 19-23nm 范围内，沉淀剂浓度对 NPs 的形态没有显著影响。此外，沉淀剂浓度会影响所制备氧化铝 NPs 的光学特性，样品的能带隙能量在 4.24 和 5.05eV 之间变化。沉淀剂浓度的最重要影响反映在其比表面积和去除铜离子的能力上，在碱溶液中达到了超高的 SSA=317m2/g，在吸附剂浓度为 184mg/L 时达到了最高的铜去除率，然后是中性溶液。然而，在给定浓度的碳酸氢铵下合成的氧化铝 NPs 浓度为 0.9g/L 的酸性溶液中，甚至可以实现令人钦佩的 98.2%的铜去除率，因此该样品可以成为从酸性废水中去除 Cu 离子的良好候选物。
