Laboratory of Separation and Reaction Engineering, Departamento de Engenharia Química, Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
J Hazard Mater. 2011 Feb 28;186(2-3):1042-9. doi: 10.1016/j.jhazmat.2010.11.102. Epub 2010 Dec 3.
The present study was conducted to evaluate the feasibility of nano-alumina (Al(2)O(3)) for fluoride adsorption from aqueous solutions. The nature and morphology of pure and fluoride-sorbed nano-alumina were characterized by SEM with EDX, XRD, and FTIR analysis. Batch adsorption studies were performed as a function of contact time, initial fluoride concentration, temperature, pH and influence of competing anions. Fluoride sorption kinetics was well fitted by pseudo-second-order model. The maximum sorption capacity of nano-alumina for fluoride removal was found to be 14.0 mg g(-1) at 25°C. Maximum fluoride removal occurred at pH 6.15. The fluoride sorption has been well explained using Langmuir isotherm model. Fluoride sorption was mainly influenced by the presence of PO(4)(3-), SO(4)(2-) and CO(3)(2-) ions.
本研究旨在评估纳米氧化铝 (Al(2)O(3)) 从水溶液中吸附氟化物的可行性。通过 SEM 结合 EDX、XRD 和 FTIR 分析对纯纳米氧化铝和吸附氟化物后的纳米氧化铝的性质和形态进行了表征。作为接触时间、初始氟化物浓度、温度、pH 值以及竞争阴离子影响的函数进行了批量吸附研究。氟化物吸附动力学很好地符合拟二级模型。在 25°C 时，纳米氧化铝对氟化物去除的最大吸附容量为 14.0 mg g(-1)。最大氟化物去除发生在 pH 6.15。氟化物吸附很好地用 Langmuir 等温线模型解释。氟化物吸附主要受 PO(4)(3-)、SO(4)(2-) 和 CO(3)(2-)离子的存在影响。
