Conde-González J E, Lorenzo-Luis P, Salvadó V, Havel J, Peña-Méndez E M
Departamento de Química, Unidad Departamental de Química Analítica, Facultad de Ciencias, Universidad de La Laguna, Tenerife, Spain.
Inorganic Chemistry Area, Section of Chemistry Faculty of Science, Tenerife, Spain.
Heliyon. 2021 Dec 4;7(12):e08524. doi: 10.1016/j.heliyon.2021.e08524. eCollection 2021 Dec.
A new Cotton@Fe-BTC composite formed by Fe-BTC (BTC-H: trimesic acid) metal framework (Fe-BTC MOF loading as high 38 wt %) supported by cellulose fiber is synthesized in aqueous media using a simple and green preparation method, described for the first time in this manuscript. This new strategy relies on the synergetic effect of the pure cellulose and MOFs frameworks resulting in hybrid nanofibers of MOFs@cellulose composite. A complete characterization of the composite material reveals its structural similarity to MIL-100(Fe), a Fe-BTC material. The Cotton@Fe-BTC composite potential use as an eco-friendly and low-cost adsorbent was evaluated for its adsorptive performance for the removal of dye belonging to the triarylmethane dye family (Malachite Green (MQ), Brilliant Green (BG), Pararosaniline (PR), Basic Fuchsine (BF), Crystal Violet (CV), Methyl Green (Met-G), Victoria Blue B (VB), Acid Fuchsin (AF) and Aniline Blue (AB)) in aqueous solution. The fast kinetics and high dye removal efficiencies (>90%) obtained in aqueous solutions. The structure of Cotton@Fe-BTC network, contributed to the remarkable adsorption properties towards a variety of triphenylmethanedye. The interparticle studies showed two main steps in the dye adsorption processes, with the exception of AF and BG. The equilibrium adsorption capacities q (mg/g) follow the order: AF (3.64)<Met-G (3.70)<AB (4.87)<PR (5.52)<BF (5.76)< Met-G (7.22)<CV (9.63)<BG (16.34). However, going insight the adsorption mechanisms, it was remarkable the finding that the reaction paths taking into account the influence of water molecules on the anionic dye adsorption, through the so-called solvation/desolvation penalty processes, may not be ignored. The easy preparation and manipulation of Cotton@Fe-BTC network as well as its stability and excellent performance for the adsorption makes this material a good candidate for a broad range of applications.
通过简单且绿色的制备方法，在水介质中合成了一种由纤维素纤维负载的Fe-BTC（BTC-H：均苯三甲酸）金属框架（Fe-BTC金属有机框架负载量高达38 wt%）形成的新型Cotton@Fe-BTC复合材料，本文首次对此进行描述。这种新策略依赖于纯纤维素和金属有机框架的协同效应，从而形成了MOFs@纤维素复合材料的混合纳米纤维。对该复合材料的全面表征揭示了其与Fe-BTC材料MIL-100(Fe)的结构相似性。评估了Cotton@Fe-BTC复合材料作为一种环保且低成本吸附剂对水溶液中三芳基甲烷染料家族（孔雀石绿（MQ）、亮绿（BG）、副蔷薇苯胺（PR）、碱性品红（BF）、结晶紫（CV）、甲基绿（Met-G）、维多利亚蓝B（VB）、酸性品红（AF）和苯胺蓝（AB））染料的吸附性能。在水溶液中获得了快速动力学和高染料去除效率（>90%）。Cotton@Fe-BTC网络结构对多种三苯甲烷染料具有显著的吸附性能。除AF和BG外，颗粒间研究表明染料吸附过程有两个主要步骤。平衡吸附容量q（mg/g）的顺序为：AF（3.64）<Met-G（3.70）<AB（4.87）<PR（5.52）<BF（5.76）<Met-G（7.22）<CV（9.63）<BG（16.34）。然而，深入研究吸附机制时，值得注意的是，考虑到水分子对阴离子染料吸附的影响，通过所谓的溶剂化/去溶剂化惩罚过程的反应路径不能被忽视。Cotton@Fe-BTC网络易于制备和操作，以及其稳定性和优异的吸附性能，使其成为广泛应用的良好候选材料。
