Mafra Gabriela, Brognoli Rafael, Carasek Eduardo, López-Lorente Ángela I, Luque Rafael, Lucena Rafael, Cárdenas Soledad
Departamento de Química Analítica, Instituto Universitario de Investigación en Química Fina y Nanoquímica (IUNAN), Universidad de Córdoba, Campus de Rabanales, Edificio Marie Curie, E-14071 Córdoba, Spain.
Departamento de Química, Universidade Federal de Santa Catarina, Florianópolis, SC 88040-900, Brazil.
ACS Omega. 2021 Mar 29;6(14):9577-9586. doi: 10.1021/acsomega.1c00128. eCollection 2021 Apr 13.
Clean water is one of the sustainable development goals set by the United Nations for 2030. The development of effective but worldwide affordable strategies is essential to guarantee this achievement. Photocatalysis technology fulfills these criteria whenever the photocatalyst is sustainable and nontoxic. In this article, a cellulose-paper modified with a polyamide-titanium dioxide (TiO) nanocomposite by dip-coating is evaluated to degrade estrogens efficiently under solar light. The study deepens on the synergic combination of the sorptive capacity of the polyamide and the activity of TiO. The photocatalytic performance was studied under artificial and sunlight in a miniaturized experimental setup (batch of six reactors). Also, the effects of the dispersed/immobilized catalyst, irradiation time, and adsorption evaluation were studied under kinetic conditions. The photocatalyst composition, considering the polyamide (nylon-6) and TiO amounts and the dipping cycles, was studied by a response surface methodology, and the reusability of the photocatalytic cellulose-paper was investigated. The LED source provided removal efficiencies of 65, 62, and 52% (for estrone, 17β-estradiol, and estriol, respectively) after 420 min of light exposure. Under sunlight, the efficiency increased up to 99.5% for estrone and 17β-estradiol and 98.5% for estriol after 180 min of irradiation. The sustainable character of the cellulosic substrate, the low toxicity of the nanocomposite ingredients, and its performance under sunlight make the material attractive for in-field application.
清洁水是联合国为2030年设定的可持续发展目标之一。制定有效且全球可负担的战略对于确保这一目标的实现至关重要。只要光催化剂具有可持续性且无毒，光催化技术就能满足这些标准。在本文中，对通过浸涂法用聚酰胺 - 二氧化钛（TiO₂）纳米复合材料改性的纤维素纸进行了评估，以研究其在太阳光下有效降解雌激素的能力。该研究深入探讨了聚酰胺的吸附能力与TiO₂活性的协同组合。在小型实验装置（六个反应器的批次）中研究了该光催化剂在人工光和太阳光下的光催化性能。此外，还研究了分散/固定化催化剂、辐照时间和吸附评估在动力学条件下的影响。采用响应面法研究了考虑聚酰胺（尼龙 - 6）和TiO₂用量以及浸涂次数的光催化剂组成，并研究了光催化纤维素纸的可重复使用性。LED光源在光照420分钟后，对雌酮、17β - 雌二醇和雌三醇的去除效率分别为65%、62%和52%。在太阳光下，辐照180分钟后，雌酮和17β - 雌二醇的去除效率提高到99.5%，雌三醇的去除效率提高到98.5%。纤维素基材的可持续特性、纳米复合材料成分的低毒性及其在太阳光下的性能使得该材料在现场应用中具有吸引力。
