Faculty of Engineering, Civil Engineering Department, Kharazmi University, Tehran, Iran.
Faculty of Engineering, Civil Engineering Department, Kharazmi University, Tehran, Iran.
Carbohydr Polym. 2018 Feb 1;181:675-683. doi: 10.1016/j.carbpol.2017.11.095. Epub 2017 Nov 27.
In the present study, a novel cross-linked magnetic EDTA/chitosan/TiO (MECT) was prepared as eco-friendly and efficient bioadsorbent for the removal of Cd(II) ions and phenol from aqueous solution. Magnetic chitosan was improved by surface functionalization and cross-linking of it with EDTA and photocatalytic with TiO. The nanocomposite was characterized by FE-SEM, EDX, FTIR and XRD techniques and Cd(II) ions adsorption and phenol degradation under varied experimental conditions were investigated. Results revealed that MECT nanoparticle with an average diameter of 40nm had the best performance in adsorption of Cd(II) and degradation of phenol at optimum pH values of 5-6. Moreover, the adsorption kinetics proceeded according to the mechanism of the pseudo-second-order model. The maximum adsorption capacity of Cd(II) obtained from Langmuir model was 209.205mgg and phenol degradation efficiency was up to 90%. Reusability of MECT was tested and the adsorption and degradation capacities were not affected after five cycles. The paper suggests that the MECT is a promising recyclable nanocomposite for the removal of hazardous pollutants from contaminated water.
在本研究中，制备了一种新型交联磁性 EDTA/壳聚糖/TiO（MECT），作为一种环保且高效的生物吸附剂，用于从水溶液中去除 Cd(II)离子和苯酚。通过表面功能化和与 EDTA 的交联以及光催化 TiO 对磁性壳聚糖进行了改进。采用 FE-SEM、EDX、FTIR 和 XRD 技术对纳米复合材料进行了表征，并在不同实验条件下研究了 Cd(II)离子吸附和苯酚降解。结果表明，平均直径为 40nm 的 MECT 纳米颗粒在吸附 Cd(II)和降解苯酚方面的性能最佳，最佳 pH 值为 5-6。此外，吸附动力学符合准二级模型的机制。从 Langmuir 模型获得的 Cd(II)的最大吸附容量为 209.205mgg，苯酚降解效率高达 90%。测试了 MECT 的可重复使用性，经过五次循环后，吸附和降解能力没有受到影响。该论文表明，MECT 是一种有前途的可回收纳米复合材料，可用于去除受污染水中的有害污染物。
