Modified nickel ferrite nanocomposite/functionalized chitosan as a novel adsorbent for the removal of acidic dyes
Modified nickel ferrite nanocomposite/functionalized chitosan as a novel adsorbent for the removal of acidic dyes
复制标题
DOI：
10.1016/j.ijbiomac.2018.09.198
复制
发表时间：
2018-12-01
影响因子：
8.2
通讯作者：
Allahresani, Ali
中科院分区：
文献类型：
--
作者：
Moghaddam, Ali Zeraatkar;Ghiamati, Ebrahim;Allahresani, Ali
作为一种新型的磁性吸附剂，制备了功能化壳聚糖改性的铁酸镍纳米复合材料，用于去除水中的甲基橙子和刚果红。对该新型吸附剂进行了表征，并采用间歇吸附法探讨了其去除甲基橙子和刚果红的机理。在此基础上，采用响应面法对影响染料去除效果的相关参数，即溶液pH值、染料初始浓度、吸附剂投加量和接触时间进行了优化研究。此外，动力学和等温线的研究进行了开发系统。采用Langmuir吸附等温模型对吸附等温线进行了拟合，得到吸附剂对甲基橙子和刚果的吸附容量分别为5512和274.7 mg g（-1）。甲基橙子和刚果红的吸附动力学均符合准二级动力学模型，表明吸附是速率限制步骤，仅需5 min即可去除50%的染料。采用颗粒内扩散模型对实验数据进行拟合，得出吸附动力学同时受膜扩散和颗粒内扩散控制的结论。吸附剂对染料的脱附研究表明，该吸附剂具有良好的重复使用性能. (C)2018爱思唯尔B. V.保留所有权利。
As a new type of magnetic adsorbent, a nickel ferrite nanocomposite modified by functionalized chitosan was developed to remove methyl orange and Congo red from aqueous solutions. This new adsorbent was characterized and utilizing batch adsorption approach, the mechanism of methyl orange and Congo red removal were probed. Following that the study on pertinent parameters which could influence the efficiency of the dyes removal, i.e. pH of the solution, initial dye concentration, dose of the adsorbent, and contact time were accomplished in order to arrive their optimized values by using response surface methodology. In addition, kinetics and isotherm studies were conducted on the developed system. Langmuir model was used to probe adsorption isotherm, acquiring adsorption capacity of 5512 and 274.7 mg g(-1) for methyl orange and Congo red, respectively. Both of methyl orange and Congo red adsorption kinetics obeyed a pseudo-second-order kinetic model, indicating that adsorption was the rate-limiting step and only 5 min was required to remove 50% of dyes. The fitting of experimental data was fulfilled with intra-particle diffusion reaching to conclusion that the adsorption kinetic could be controlled simultaneously by film diffusion and intra-particle diffusion. Furthermore, the desorption studies of dyes showed that the adsorbent is reusable. (C) 2018 Elsevier B.V. All rights reserved.