Department of Chemistry, University of Bari Aldo Moro, Via Orabona 4, 70126 Bari, Italy.
National Research Council of Italy-Institute for Physical and Chemical Processes (CNR-IPCF S.S. Bari), c/o Department of Chemistry, University of Bari Aldo Moro, Via Orabona 4, 70126 Bari, Italy.
Int J Mol Sci. 2021 Nov 3;22(21):11916. doi: 10.3390/ijms222111916.
Mussel-inspired chemistry was usefully exploited here with the aim of developing a high-efficiency, environmentally friendly material for water remediation. A micro-structured material based on polydopamine (PDA) was obtained by using liposomes as templating agents and was used for the first time as an adsorbent material for the removal of methylene blue (MB) dye from aqueous solutions. Phospholipid liposomes were made by extrusion and coated with PDA by self-polymerization of dopamine under simple and mild conditions. The obtained Liposome@PDA microspheres were characterized by DLS and Zeta potential analysis, TEM microscopy, and FTIR spectroscopy. The effects of pH, temperature, MB concentration, amount of Liposome@PDA, and contact time on the adsorption process were investigated. Results showed that the highest adsorption capacity was obtained in weakly alkaline conditions (pH = 8.0) and that it could reach up to 395.4 mg g at 298 K. In addition, adsorption kinetics showed that the adsorption behavior fits a pseudo-second-order kinetic model well. The equilibrium adsorption data, instead, were well described by Langmuir isotherm. Thermodynamic analysis demonstrated that the adsorption process was endothermic and spontaneous (ΔG = -12.55 kJ mol, ΔH = 13.37 kJ mol) in the investigated experimental conditions. Finally, the applicability of Liposome@PDA microspheres to model wastewater and the excellent reusability after regeneration by removing MB were demonstrated.
受贻贝启发的化学被有效地利用，旨在开发一种高效、环保的水修复材料。本文首次采用基于聚多巴胺（PDA）的微结构化材料作为吸附剂，从水溶液中去除亚甲基蓝（MB）染料。通过挤压制备了磷脂脂质体，并在简单温和的条件下，通过多巴胺的自聚合将其涂覆在 PDA 上。通过动态光散射（DLS）和 Zeta 电位分析、TEM 显微镜和傅里叶变换红外光谱（FTIR）对所得的脂质体@PDA 微球进行了表征。考察了 pH、温度、MB 浓度、脂质体@PDA 的用量和接触时间对吸附过程的影响。结果表明，在弱碱性条件（pH=8.0）下，吸附容量最高，在 298 K 时可达 395.4 mg g。此外，吸附动力学表明吸附行为很好地符合拟二级动力学模型。平衡吸附数据则很好地符合 Langmuir 等温线。热力学分析表明，在研究的实验条件下，吸附过程是吸热和自发的（ΔG=-12.55 kJ mol，ΔH=13.37 kJ mol）。最后，证明了脂质体@PDA 微球在模型废水中的适用性以及通过再生去除 MB 后的优异可重复使用性。
