Xiong Ting, Xu Xintao, Tang Chao, Guo Hai, Wang Wenjun, Liu Milan, Guo Jiayin, Wang Hou, Leng Lijian, Liu Bing, Yuan Xingzhong
School of Advanced Interdisciplinary Studies, Hunan University of Technology and Business, Changsha, 410205, China; Xiangjiang Laboratory, Changsha, 410205, China.
School of Advanced Interdisciplinary Studies, Hunan University of Technology and Business, Changsha, 410205, China.
J Environ Manage. 2024 Nov;370:122556. doi: 10.1016/j.jenvman.2024.122556. Epub 2024 Oct 1.
Seeking highly efficient adsorbents for pharmaceuticals and personal care products (PPCPs) removal has been a worldwide continuing endeavor. In this study, a new 3D composite material was synthesized by covalently anchoring Poly(m-Phenylenediamine) onto 3D polyvinyl alcohol modified foam framework (PmPD-MF-PVA). PmPD-MF-PVA was characterized and evaluated for its efficacy in removing diclofenac (DCF), a commonly detected PPCPs in both wastewater and surface water. Results showed that the adsorption capacity of PmPD-MF-PVA toward DCF was 1.5 times higher than that of PmPD-MF. The addition of PVA increased deposition area of PmPD, and promoted PmPD loading on the foam surface. Batch adsorption experiments exhibited that the adsorption of DCF was fitted well with Langmuir isotherm and pseudo-second-order kinetic models. The maximum adsorption capacity of PmPD-MF-PVA was 115 mg/g. Meanwhile, PmPD-MF-PVA exhibited better separation ability than the hard-to-separate PmPD. Characterization analysis and density functional theory (DFT) calculation elucidated the main mechanisms of DCF adsorption on PmPD-MF-PVA. Hydrogen bonding and π-π interactions were main drivers for DCF adsorption, followed by electrostatic attraction and hydrophobic forces. This study provides an effective strategy to overcome the drawbacks of PmPD, such as recycling difficulty and agglomeration problems, offering valuable insights for the design of polymers-based adsorbents.
寻找高效去除药物和个人护理产品（PPCPs）的吸附剂是一项全球范围内持续进行的工作。在本研究中，通过将聚间苯二胺共价锚定到三维聚乙烯醇改性泡沫骨架（PmPD-MF-PVA）上合成了一种新型三维复合材料。对PmPD-MF-PVA进行了表征，并评估了其去除双氯芬酸（DCF）的效果，DCF是废水和地表水中常见的一种PPCPs。结果表明，PmPD-MF-PVA对DCF的吸附容量比PmPD-MF高1.5倍。PVA的加入增加了PmPD的沉积面积，并促进了PmPD在泡沫表面的负载。批量吸附实验表明，DCF的吸附符合Langmuir等温线和准二级动力学模型。PmPD-MF-PVA的最大吸附容量为115 mg/g。同时，PmPD-MF-PVA比难以分离的PmPD表现出更好的分离能力。表征分析和密度泛函理论（DFT）计算阐明了DCF在PmPD-MF-PVA上吸附的主要机制。氢键和π-π相互作用是DCF吸附的主要驱动力，其次是静电吸引和疏水作用力。本研究提供了一种有效的策略来克服PmPD的缺点，如回收困难和团聚问题，为基于聚合物的吸附剂设计提供了有价值的见解。
