Jin Linfeng, Pan Qinglin, Li Xiaorui, Su Changqing, Wang Zhongyu, Wang Haiying, Huang Lei
School of Materials Science and Engineering, Central South University, Changsha 410083, China.
School of Resources and Environment, Hunan University of Technology and Business, Changsha 410205, China.
Nanomaterials (Basel). 2022 Aug 18;12(16):2838. doi: 10.3390/nano12162838.
Heavy metal pollution is a serious threat to human health and the ecological environment, but adsorption technology based on nano adsorbents can effectively treat the crisis. However, due to the nanoscale effect, nano adsorbents have some crucial shortcomings, such as recycling difficulty and the loss of nanoparticles, which seriously limit their application. The feasible assembly of nano adsorbents is an accessible technology in urgent need of a breakthrough. In this study, three-dimensional (3D) adsorbent (MF/TiCT/PmPD) with excellent performance and favorable recyclability was prepared by interfacial polymerization with melamine foam (MF) as the framework, two-dimensional (2D) titanium carbide (TiCT) as the bridge and Poly (m-Phenylenediamine) (PmPD) as the active nano component. The morphology, structure, mechanical property of MF/TiCT/PmPD and reference MF/PmPD were investigated through a scanning electron microscope (SEM), Fourier transformed infrared spectra (FT-IR), Raman scattering spectra and a pressure-stress test, respectively. Owning to the regulation of TiCT on the morphology and structure of PmPD, MF/TiCT/PmPD showed excellent adsorption capacity (352.15 mg/g) and favorable cycling performance. R-P and pseudo-second-order kinetics models could well describe the adsorption phenomenon, indicating that the adsorption process involved a composite process of single-layer and multi-layer adsorption and was dominated by chemical adsorption. In this research, the preparation mechanism of MF/TiCT/PmPD and the adsorption process of Cr(VI) were systematically investigated, which provided a feasible approach for the feasible assembly and application of nano adsorbents in the environmental field.
重金属污染对人类健康和生态环境构成严重威胁，但基于纳米吸附剂的吸附技术可以有效应对这一危机。然而，由于纳米尺度效应，纳米吸附剂存在一些关键缺点，如回收困难和纳米颗粒损失，这严重限制了它们的应用。纳米吸附剂的可行组装是一项急需突破的技术。在本研究中，以三聚氰胺泡沫（MF）为骨架、二维碳化钛（TiCT）为桥梁、聚间苯二胺（PmPD）为活性纳米组分，通过界面聚合制备了具有优异性能和良好可回收性的三维（3D）吸附剂（MF/TiCT/PmPD）。分别通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FT-IR）、拉曼散射光谱和压力-应力测试对MF/TiCT/PmPD和参比MF/PmPD的形貌、结构、力学性能进行了研究。由于TiCT对PmPD的形貌和结构有调控作用，MF/TiCT/PmPD表现出优异的吸附容量（352.15 mg/g）和良好的循环性能。R-P和准二级动力学模型能够很好地描述吸附现象，表明吸附过程涉及单层和多层吸附的复合过程，且以化学吸附为主。本研究系统地研究了MF/TiCT/PmPD的制备机理和Cr(VI)的吸附过程，为纳米吸附剂在环境领域的可行组装和应用提供了一种可行的方法。
