Research Center for Eco-environmental Engineering, Dongguan University of Technology, 523808, Dongguan, China; College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, China.
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, China.
Chemosphere. 2024 Sep;364:143104. doi: 10.1016/j.chemosphere.2024.143104. Epub 2024 Aug 17.
Arsenic contamination of water is a global environmental concern, and membrane technology combined with nanotechnology contributes to more efficient removal of arsenic. In this study, Fe-Mn oxide (FM), Polydopamine (PDA), and PDA-modified FM (PFM) were incorporated into polysulfone (PSF) to prepare adsorption membranes (PFMP) for arsenic removal. The prepared nanoparticles and membranes were characterized using TEM, SEM, FTIR, TGA, contact angle, and pure water flux. The introduction of particles enhanced the hydrophilicity of the membranes and significantly enhanced the pure water flux of the membranes. Adsorption experiments indicated that the PFMP membrane exhibited the best arsenic removal performance, with maximum adsorption capacities for As(III) and As(V) were 11.57 mg/g and 12.39 mg/g, respectively. The Langmuir model fitted the adsorption isotherms well, and the kinetics followed the pseudo-second-order model. The filtration experiment revealed that the PFMP membrane was capable of reducing As(III) solution (915 L/m) and As(V) solution (1075 L/m) from a concentration of 100 μg/L to the safe limit of As (＜10 μg/L). The As-loaded membrane was regenerated using NaOH solution (pH = 11), and the filtration experiment was repeated. FTIR and XPS demonstrated that the mechanism of the reaction between the membrane and arsenic was ligand exchange, where the arsenic ions were bonded to the oxygen ions to form Mn-O-As and Fe-O-As.
水中砷的污染是一个全球性的环境问题，膜技术与纳米技术的结合有助于更有效地去除砷。在这项研究中，将 Fe-Mn 氧化物（FM）、聚多巴胺（PDA）和 PDA 修饰的 FM（PFM）掺入聚砜（PSF）中，制备了用于去除砷的吸附膜（PFMP）。采用 TEM、SEM、FTIR、TGA、接触角和纯水通量对制备的纳米粒子和膜进行了表征。粒子的引入提高了膜的亲水性，显著提高了膜的纯水通量。吸附实验表明，PFMP 膜具有最佳的除砷性能，对 As(III)和 As(V)的最大吸附容量分别为 11.57 mg/g 和 12.39 mg/g。Langmuir 模型很好地拟合了吸附等温线，动力学遵循准二级模型。过滤实验表明，PFMP 膜能够将 As(III)溶液（915 L/m）和 As(V)溶液（1075 L/m）从 100 μg/L 的浓度降低到安全的砷浓度（＜10 μg/L）。使用 NaOH 溶液（pH = 11）对负载砷的膜进行再生，并重复过滤实验。FTIR 和 XPS 表明，膜与砷之间的反应机制是配体交换，砷离子与氧离子结合形成 Mn-O-As 和 Fe-O-As。
