Xu Ruilan, Peng Yong
School of Science, Nanchang Institute of Technology, Nanchang 330099, China.
Materials (Basel). 2019 Sep 4;12(18):2844. doi: 10.3390/ma12182844.
Catechol has strong toxicity and deformity as well as carcinogenicity, and it is difficult to degrade naturally. Therefore, it is of great practical significance to develop efficient adsorbents to separate catechol from water quickly and effectively. In this work, g-CN/FeO magnetic nanocomposites were prepared using g-CN as the matrix by chemical co-precipitation, mixing with Fe and Fe solutions. Then, g-CN/FeO was used, for the first time, as an adsorbent to investigate the removal rate of catechol under different conditions by the magnetic field separation method. The adsorption parameters of the g-CN/FeO nanocomposite were evaluated by the Langmuir and Freundlich adsorption models. The results showed that the g-CN/FeO nanocomposite presented a two-step adsorption behavior and a considerably high adsorption capacity. The removal rate of catechol reached 70% at the dosage of 50 mg, adsorption time of 30 min, and pH value of 6. Five adsorption-desorption cycles demonstrated that the g-CN/FeO material had good stability and reusability.
邻苯二酚具有很强的毒性、致畸性和致癌性，且难以自然降解。因此，开发高效吸附剂以快速有效地从水中分离邻苯二酚具有重要的实际意义。在本工作中，以g-CN为基质，通过化学共沉淀法，将其与铁和铁溶液混合，制备了g-CN/FeO磁性纳米复合材料。然后，首次将g-CN/FeO用作吸附剂，通过磁场分离法研究不同条件下邻苯二酚的去除率。采用Langmuir和Freundlich吸附模型对g-CN/FeO纳米复合材料的吸附参数进行评估。结果表明，g-CN/FeO纳米复合材料呈现两步吸附行为，且具有相当高的吸附容量。在投加量为50mg、吸附时间为30min、pH值为6时，邻苯二酚的去除率达到70%。五次吸附-解吸循环表明，g-CN/FeO材料具有良好的稳定性和可重复使用性。
