An adsorbent based on faujasite zeolite (FAU)/poly(lactic acid) (PLA) composite fibers was prepared by electrospinning technique and used for the removal of dyes from contaminated water. FAU particles concentration effect from PLA and the flow rate were evaluated on fibers production. Uniform fibers were produced increasing PLA concentration from 10 to 15% w/v. For FAU/PLA composite, uniform fibers were obtained with regular particles distribution on the polymer matrix by FAU adding 20% w/w at an optimal flow rate (2.0 mL h−1). The adsorption assays using the composite reveal a promising material for cationic dyes removal in aqueous medium using adsorption process, maintaining efficiencies above 80% for rhodamine B and 90% for methylene blue after 90 min. In addition, the FAU/PLA composite fibers allowed their use as a potential adsorbent material easily removed from the medium by mechanical forces. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48561.
Industrial effluents and wastewater treatment have been a mainstay of environmental preservation and remediation for the last decade. Silica nanoparticles (SiO2) obtained from rice husk (RH) are an alternative to producing low-cost adsorbent and agriculture waste recovery. One adsorption challenge is facilitating the adsorbate separation and reuse cycle from aqueous medium. Thus, the present work employs SiO2 supported on polylactic acid (PLA) nanofibers obtained by the electrospinning method for Rhodamine B (RhB) dye adsorption. The silica surface was modified with trimethylsilyl chloride (TMCS) to increase affinity towards organic compounds. As a result, the silanized surface of the silica from rice husk (RHSil) promoted an increase in dye adsorption attributed to the hydrophobic properties. The PLA fibers containing 40% SiO2 (w w−1) showed about 85–95% capacity adsorption. The pseudo-first-order kinetic model was demonstrated to be the best model for PLA:SiO2 RHSil nanocomposites, exhibiting a 1.2956 mg g−1 adsorption capacity and 0.01404 min−1 kinetic constant (k1) value. In the reuse assay, PLA:SiO2 membranes preserved their adsorption activity after three consecutive adsorption cycles, with a value superior to 60%. Therefore, PLA:SiO2 nanocomposites from agricultural waste are an alternative to “low-cost/low-end” treatments and can be used in traditional treatment systems to improve dye removal from contaminated waters.
Luminescent complexes of rare earth have been extensively studied in different fields of research improving the industrial development of these materials for their utilization as electroluminescent displays, catalysts and biomaterials. The interest in rare earth compounds having aromatic ambidental ligands has increased since it was found that they can act as light collectors (antenna effect), thus bypassing the weak absorption of the lanthanides and resulting in highly efficient luminophors. In this work ZrO 2 was prepared by the hydrothermal microwave method (HMM) at 140°C for 32 min. The hybrid materials was obtained using the previous ZrO 2 dispersed in distilled H 2 O, to which was added Eu 3+ and the 3-hydroxypicolinamide (Hhpa), and then stirred for about 3 h. The materials were analyzed by X-ray diffraction (XRD) and Transmission electron microscopy (TEM). The photoluminescent properties were investigated through their excitation and emission spectra, and gas sensor studies were also performed. It was observed the presence of completely crystalline powders for all materials, and XRD peaks were indexed to the tetragonal phase of ZrO 2 (JCPDS 50-1089). TEM micrographs reveal a spherical nanostructure pattern presenting an average diameter of 4 nm. Excitation and emission spectra revealed the characteristic peaks of the Eu 3+ transitions. The studies of these powders as gas sensors showed a significative change in the electric resistance for the hybrid material.
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