State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Sci Rep. 2017 Aug 11;7(1):7878. doi: 10.1038/s41598-017-08220-6.
Removal of toxic dyes from wastewater has become a hot topic in both academic and industrial fields since there is growing concern about the threat of sewage to human health. Herein, we demonstrate that the three-dimensional porous polyacrylamide-phytic acid-polydopamine (termed as PAAM/PA/PDA) hydrogel can be served as reusable adsorbent with high efficiency for either anionic or cationic dyes. Using methyl blue (MB), methylene blue (YMB), methyl violet (MV) and neutral red (NR) as model dyes, we investigate the effect of pH, temperature, dye concentration, and PAAM/PA/PDA hydrogel mass on the adsorption. The experimental maximum adsorption capacities are more than 350.67 mg g for four selected dyes. Adsorption kinetic and thermodynamic analysis suggests that the dyes are adsorbed on the PAAM/PA/PDA hydrogel through the strong π-π stacking and anion-cation interaction, and the adsorption process satisfies a pseudo-second-order model. Furthermore, the free-standing PAAM/PA/PDA hydrogel can be easily removed from water after adsorption process, and regenerated by adjusting solution pH values.
去除废水中的有毒染料已经成为学术和工业领域的热门话题，因为人们越来越关注污水对人类健康的威胁。在此，我们证明三维多孔聚丙烯酰胺-植酸-聚多巴胺（称为 PAAM/PA/PDA）水凝胶可用作高效的阴离子或阳离子染料的可重复使用的吸附剂。我们使用亚甲基蓝（MB）、碱性品红（YMB）、结晶紫（MV）和中性红（NR）作为模型染料，研究了 pH 值、温度、染料浓度和 PAAM/PA/PDA 水凝胶质量对吸附的影响。实验的最大吸附容量对于四种选定的染料超过 350.67mg/g。吸附动力学和热力学分析表明，染料通过强 π-π 堆积和阴离子-阳离子相互作用吸附在 PAAM/PA/PDA 水凝胶上，吸附过程符合准二级模型。此外，吸附后，自由站立的 PAAM/PA/PDA 水凝胶可以很容易地从水中去除，并通过调节溶液 pH 值进行再生。
