Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China.
Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, 650500, PR China.
J Hazard Mater. 2020 Jun 15;392:122263. doi: 10.1016/j.jhazmat.2020.122263. Epub 2020 Feb 9.
Herein, a novel Fe-stabilized magnetic polydopamine composite (FeO/PDA-Fe) was facilely constructed, systematically characterized, and subsequently applied for the first time as a versatile adsorbent for treatment of Methylene blue (MB) in complex wastewater. Results showed that as-prepared material had prominent adsorption ability toward MB in its single dye solution over a wide pH range (3-10) with q value of 608.8 mg/g at 318 K. More interestingly, MB could be selectively captured by resulting adsorbent from mixed dye solutions (MB-cationic dye and MB-anionic dye) and complex aqueous solution with high ionic strength up to 0.5 mol/L NaCl. It was eventually revealed that the enhanced and selective adsorption of MB by as-resultant adsorbent was due to the synergistic effects between multiple uptake mechanisms. What's more, its adsorption efficiency toward MB in simulated wastewater still maintained higher than 80 % of its original uptake performance after several runs of adsorption-desorption. Additionally, it exhibited more superior uptake performance toward MB than commercial powder activated carbon (PAC) in column adsorption system. Thus, the outstanding sorption ability, unique capture selectivity, as well as excellent stability and recyclability for model wastewater endow it a promising candidate adsorbent for selective adsorption and separation of MB from complex wastewater.
本文构建了一种新型的 Fe 稳定磁性聚多巴胺复合材料（FeO/PDA-Fe），对其进行了系统的表征，并首次将其用作处理复杂废水中亚甲基蓝（MB）的多功能吸附剂。结果表明，该材料在较宽的 pH 值范围（3-10）内对单一染料溶液中的 MB 具有突出的吸附能力，在 318 K 时的吸附量为 608.8mg/g。更有趣的是，所得吸附剂可以从混合染料溶液（MB-阳离子染料和 MB-阴离子染料）和高离子强度（高达 0.5 mol/L NaCl）的复杂水溶液中选择性地捕获 MB。最终发现，由于多种吸附机制的协同作用，所得吸附剂对 MB 的增强和选择性吸附。更重要的是，在模拟废水的几个吸附-解吸循环后，其对 MB 的吸附效率仍保持在其原始吸附性能的 80%以上。此外，在柱吸附系统中，它对 MB 的吸附性能优于商业粉末活性炭（PAC）。因此，该材料对模型废水具有出色的吸附能力、独特的捕获选择性以及良好的稳定性和可回收性，有望成为从复杂废水中选择性吸附和分离 MB 的候选吸附剂。
