Albistur Ainhoa, Rivero Pedro J, Esparza Joseba, Rodríguez Rafael
Engineering Department, Campus Arrosadía s/n, Public University of Navarre, 31006 Pamplona, Spain.
Institute for Advanced Materials and Mathematics (INAMAT2), Campus Arrosadía s/n, Public University of Navarre, 31006 Pamplona, Spain.
Polymers (Basel). 2021 Jun 20;13(12):2011. doi: 10.3390/polym13122011.
This paper reports the development and characterization of a multifunctional coating that combines anticorrosion and photocatalytic properties, deposited by means of the electrospinning technique. In the first step, a functional electrospun fiber mat composed of poly(acrylic acid) (PAA) and β-cyclodextrin (β-CD) was obtained, showing high water insolubility and great adhesion increased by means of a thermal crosslinking process (denoted as PAA + β-CD). In the second step, the fibers were doped with particles of titanium dioxide (denoted as PAA + β-CD/TiO) and titanium dioxide plus iron oxide (denoted as PAA + β-CD/TiO/FeO). The morphology and fiber diameter of the electrospun mats were evaluated by using confocal microscopy, whereas the presence of the metal oxides in the electrospun fibers was corroborated by scanning electron microscopy (SEM) and X-ray fluorescence (XRF), respectively. In addition, electrochemical tests in saline solution revealed that the sample composed of PAA + β-CD/TiO/FeO showed the highest corrosion protection efficiency of all the samples, which was directly associated to lower corrosion current density and higher corrosion potential. Furthermore, the paper reports a novel approach to in situ determination of methylene blue (MB) degradation onto the coating. The results revealed complete degradation of MB, which is perfectly appreciated by total discoloration of the film in the irradiated zone (from bluish to a white spot). The main conclusions of this research are the efficiency of the electrospun system PAA + β-CD/TiO/FeO for developing photocatalytic activity and corrosion protection and the utility of the dry MB discoloration tests to evaluate photocatalytic activity.
本文报道了一种通过静电纺丝技术制备的兼具防腐和光催化性能的多功能涂层的开发与表征。第一步，制备了由聚丙烯酸（PAA）和β-环糊精（β-CD）组成的功能性静电纺丝纤维毡，通过热交联过程使其具有高水不溶性和良好的附着力（记为PAA + β-CD）。第二步，将纤维用二氧化钛颗粒（记为PAA + β-CD/TiO）和二氧化钛加氧化铁（记为PAA + β-CD/TiO/FeO）进行掺杂。利用共聚焦显微镜评估了静电纺丝毡的形态和纤维直径，分别通过扫描电子显微镜（SEM）和X射线荧光（XRF）证实了静电纺丝纤维中金属氧化物的存在。此外，在盐溶液中的电化学测试表明，由PAA + β-CD/TiO/FeO组成的样品在所有样品中显示出最高的防腐效率，这直接与较低的腐蚀电流密度和较高的腐蚀电位相关。此外，本文还报道了一种原位测定涂层上亚甲基蓝（MB）降解的新方法。结果显示MB完全降解，通过辐照区域薄膜的完全褪色（从蓝色变为白色斑点）可以清楚地观察到。本研究的主要结论是静电纺丝体系PAA + β-CD/TiO/FeO在开发光催化活性和防腐方面的效率以及干燥MB褪色测试在评估光催化活性方面的实用性。
