This paper reports the development of novel adsorbent materials using polyaniline (PANI) grafted onto Posidonia (POS) fibers, aimed at efficiently removing phenol red (PSP), an anionic dye, from aqueous solutions. The synthesis involved the copolymerization of aniline grafted on the surface of the POS and aniline monomer in solution, resulting in a chemically bound thin PANI layer on the POS bioadsorbent. Structural characteristics and binding affinities of these adsorbents with PANI under its emeraldine salt (POS@PANI-ES) or emeraldine base (POS@PANI-EB) forms are reported. The rapid adsorption kinetics observed are attributed to enhanced accessibility to PANI adsorption sites on the POS surface. The binding percentages of PSP to POS@PANI-ES and POS@PANI-EB materials were found to be 97 and 50%, respectively, after 15 min of contact time. The Langmuir model for localized adsorption sites and the Volmer model for nonlocalized adsorption as a mobile layer were fitted to the experimental adsorption isotherms of PSP to POS@PANI-EB and POS@PANI-ES, yielding the thermodynamic parameters of adsorption. The adsorption capacities of PSP on POS@PANI-EB and POS@PANI-ES were 37.8 and 71.5 μmol g^–1, respectively. The adsorption of PSP remained above 80% at moderate salt concentrations of around 0.1 mol L^–1; however, higher concentrations of NaCl and CaCl₂ in PSP solutions significantly reduced the adsorption on POS@PANI-ES.

中文翻译：

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使用纤维素生物材料上的薄阳离子聚苯胺涂层去除阴离子染料

本文报道了使用聚苯胺（PANI）接枝到Posidonia（POS）纤维上的新型吸附材料的开发，旨在有效去除水溶液中的阴离子染料酚红（PSP）。该合成涉及接枝在 POS 表面的苯胺和溶液中苯胺单体的共聚，从而在 POS 生物吸附剂上形成化学结合的 PANI 薄层。报道了这些吸附剂与翠绿亚胺盐 (POS@PANI-ES) 或翠绿亚胺碱 (POS@PANI-EB) 形式的 PANI 的结构特征和结合亲和力。观察到的快速吸附动力学归因于 POS 表面上 PANI 吸附位点的可及性增强。接触时间 15 分钟后，PSP 与 POS@PANI-ES 和 POS@PANI-EB 材料的结合百分比分别为 97% 和 50%。将局部吸附位点的 Langmuir 模型和作为移动层的非局部吸附的 Volmer 模型拟合到 PSP 到 POS@PANI-EB 和 POS@PANI-ES 的实验吸附等温线，得到吸附的热力学参数。 PSP在POS@PANI-EB和POS@PANI-ES上的吸附容量分别为37.8和71.5 μmol g ^–1。在0.1 mol L ^–1左右的中等盐浓度下，PSP 的吸附率保持在 80% 以上；然而，PSP 溶液中较高浓度的 NaCl 和 CaCl ₂显着降低了 POS@PANI-ES 上的吸附。