High adsorption capacity and the key role of carbonate groups for heavy metal ion removal by basic aluminum carbonate porous nanospheres
作者:Chang-Yan Cao、Ping Li、Jin Qu、Zhi-Feng Dou、Wen-Sheng Yan、Jun-Fa Zhu、Zi-Yu Wu、Wei-Guo Song
DOI:10.1039/c2jm34138g
日期:——
A fast, low-cost and scalable method was developed to prepare basic aluminum carbonate (Al(OH)CO3) porous nanospheres via a microwave-assisted solvothermal process in 5 min. All chemicals used were low-cost and environmentally benign. These Al(OH)CO3 nanospheres had an extremely large surface area (484 m2 g−1), abundant carbonate groups, and showed superb adsorption properties with maximum capacities of 170 mg g−1 and 60 mg g−1 for As(V) and Cr(VI) at pH 7, respectively. These values were obviously higher than that of many other nanomaterials. In addition, for practical applications, 5 mg Al(OH)CO3 nanospheres could purify 6 kg As(V) contaminated water, reducing the As(V) concentration from 100 ppb to less than 10 ppb. A new adsorption mechanism involving ion exchange between carbonate groups and As(V) or Cr(VI) species was proposed and confirmed.
开发了一种快速、低成本且可扩展的方法,通过微波辅助溶剂热过程在 5 分钟内制备碱式碳酸铝 (Al(OH)CO3) 多孔纳米球。使用的所有化学品都是低成本且环保的。这些Al(OH)CO3纳米球具有极大的表面积(484 m2 g−1)、丰富的碳酸盐基团,并表现出优异的吸附性能,对As(V)的最大容量为170 mg g−1和60 mg g−1和 Cr(VI) 分别在 pH 7 时。这些值明显高于许多其他纳米材料。此外,在实际应用中,5 mg Al(OH)CO3纳米球可以净化6 kg As(V)污染水,将As(V)浓度从100 ppb降低到10 ppb以下。提出并证实了一种新的吸附机制,涉及碳酸酯基团与 As(V) 或 Cr(VI) 物质之间的离子交换。