School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi 330031, China.
School of Materials Science and Engineering, Nanchang University, Nanchang, Jiangxi 330031, China; Department of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
J Colloid Interface Sci. 2020 May 1;567:190-201. doi: 10.1016/j.jcis.2020.02.015. Epub 2020 Feb 6.
Herein a simple and novel approach has been developed for surface modification of delaminate MXene with nano-mixed silver oxide which combined with mussel-inspired chemistry. Surface modification with dopamine as a secondary reaction platform for loading nano-silver compounds for removal of iodine was achieved. The internal structure and morphology were characterized by SEM and TEM. The element content and distribution analysis of EDS and XPS proved that nano silver compounds were successfully supported and uniformly dispersed on the surface of MXene. Then the adsorption batch experiment was carried out, adsorption time, pH and other factors on the adsorption performance of the adsorbents were studied in details. By calculating the enthalpy change, Gibbs free energy and thermodynamic parameters, the adsorption reaction was found to be an exothermic process. The adsorption kinetics measured the maximum adsorption capacity of 80 mg/g and the removal efficiency is as high as 80% and the adsorption equilibrium time has also been improved. The adsorption kinetics were well fitted by pseudo first-order and second-order models. All the above results demonstrated that the composite from mussel-inspired chemistry has excellent adsorption properties towards iodine ions. This study not only deepens the research on the adsorption behavior of iodine adsorption, but also provides new research directions and experimental methods for pseudo-iodine adsorption.
本文提出了一种简单新颖的方法，通过贻贝类化学与纳米混合氧化银相结合，对剥离的 MXene 进行表面改性。利用多巴胺作为二次反应平台，实现了负载纳米银化合物以去除碘的表面改性。通过 SEM 和 TEM 对内部结构和形态进行了表征。EDS 和 XPS 的元素含量和分布分析证明，纳米银化合物成功地负载并均匀分散在 MXene 的表面。然后进行了吸附批量实验，详细研究了吸附时间、pH 等因素对吸附剂吸附性能的影响。通过计算焓变、吉布斯自由能和热力学参数，发现吸附反应是一个放热过程。吸附动力学测量得到的最大吸附容量为 80mg/g，去除效率高达 80%，吸附平衡时间也有所提高。吸附动力学很好地符合伪一级和二级模型。所有这些结果表明，贻贝类化学的复合材料对碘离子具有优异的吸附性能。这项研究不仅加深了对碘吸附吸附行为的研究，还为假性碘吸附提供了新的研究方向和实验方法。
