Hunan Key Laboratory of Biomedical Nanomaterials and Devices, College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China; Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China.
State Key Laboratory of Ophthalmology, Optometry and Vision Science, School of Ophthalmology and Optometry, School of Biomedical Engineering, Wenzhou Medical University, Wenzhou 325027, China; Wenzhou Institute, University of Chinese Academy of Sciences, Wenzhou 325001, China.
Int J Biol Macromol. 2020 Feb 15;145:1049-1058. doi: 10.1016/j.ijbiomac.2019.09.197. Epub 2019 Nov 20.
Designing a new adsorbent with recyclability, high efficiency and biodegradability is important for treating heavy metals contamination but remains a severe challenge. In this work, a novel type of hydrogel biosorbents based on pullulan and polydopamine were designed for heavy metal ions removal from aqueous solution. The physicochemical properties of the prepared pullulan/polydopamine (Pu/PDA) hydrogels were fully characterized by thermal gravimetric analysis, Fourier transform infrared spectroscopy, rheology, scanning electron microscopy, swelling and compression tests. We observed that their mechanical strength, pore size, water absorption and retention properties could be nicely controlled by adjusting the PDA concentration in the pre-gel solution. Subsequently, the adsorption ability of designed Pu/PDA hydrogels to Cu, Co and Ni was investigated in detail. These hydrogels presented excellent adsorption capability for heavy metal ions and matched well with the pseudo-second-order kinetic model and Freundlich isotherm model. Overall, having tunable physicochemical properties coupled with the high absorption ability for heavy metal ions, these Pu/PDA hydrogels may be a promising strategy for removal of pollutants from aqueous solution.
设计一种可重复使用、高效和可生物降解的新型吸附剂对于处理重金属污染非常重要，但仍然是一个严峻的挑战。在这项工作中，设计了一种新型的基于普鲁兰多糖和聚多巴胺的水凝胶吸附剂，用于从水溶液中去除重金属离子。通过热重分析、傅里叶变换红外光谱、流变学、扫描电子显微镜、溶胀和压缩试验等手段对制备的普鲁兰多糖/聚多巴胺（Pu/PDA）水凝胶的物理化学性质进行了全面的表征。我们观察到，通过调节预凝胶溶液中 PDA 的浓度，可以很好地控制它们的机械强度、孔径、吸水率和保持率。随后，详细研究了设计的 Pu/PDA 水凝胶对 Cu、Co 和 Ni 的吸附能力。这些水凝胶对重金属离子表现出优异的吸附能力，且与准二级动力学模型和 Freundlich 等温模型吻合较好。总的来说，Pu/PDA 水凝胶具有可调的物理化学性质和对重金属离子的高吸收能力，可能是一种从水溶液中去除污染物的有前途的策略。
