Foletto Vitória Segabinazzi, Ferreira Ananda Bulegon, da Cruz Severo Eric, Collazzo Gabriela Carvalho, Foletto Edson Luiz, Dotto Guilherme Luiz
Chemical Engineering Department, Federal University of Santa Maria (UFSM), 1000 Roraima Avenue, Santa Maria, 97105-900, Brazil.
Environ Sci Pollut Res Int. 2017 Apr;24(11):10547-10556. doi: 10.1007/s11356-017-8745-7. Epub 2017 Mar 10.
A porous iron-based adsorbent obtained from litchi peel via pyrolysis process was prepared in this work, in order to evaluate its adsorptive potential for the removal of a pharmaceutical dye (amaranth) from aqueous solution. The material was characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, and scanning electron microscopy. Several isotherm and kinetic models were tested aiming to represent the amaranth dye adsorption. The prepared sample presented magnetic property, and a mesoporous texture constituted of graphite and three iron-based phases. The adsorption kinetics of amaranth on the adsorbent followed the pseudo-second-order model, whereas the equilibrium data were in good agreement with the BET isotherm, being represented by a sigmoid-shaped adsorption isotherm. The maximum adsorption capacity for the amaranth dye was found to be 44.87 mg g, demonstrating that the material prepared in this work showed to be a promising adsorbent for the removal of amaranth from aqueous solution.
本研究通过热解过程从荔枝皮中制备了一种多孔铁基吸附剂，以评估其从水溶液中去除一种药用染料（苋菜红）的吸附潜力。该材料通过X射线衍射、氮吸附-脱附等温线和扫描电子显微镜进行了表征。测试了几种等温线和动力学模型以描述苋菜红染料的吸附过程。制备的样品具有磁性，并且具有由石墨和三个铁基相组成的介孔结构。苋菜红在吸附剂上的吸附动力学遵循准二级模型，而平衡数据与BET等温线吻合良好，由S形吸附等温线表示。发现苋菜红染料的最大吸附容量为44.87 mg/g，表明本研究中制备的材料是一种从水溶液中去除苋菜红的有前景的吸附剂。
