Polyvinyl alcohol beads as hosts for flower-like magnetic nanoestructures

C. PEREDA; D. G. ACTIS; P. MENDOZA ZÉLIS; V. A. ALVAREZ; M. L. SÁNCHEZ

Valencia

Conferencia; Global conference on advances in polymer scienceand nanotechnology; 2021

The Scientistt

Dyepollutants sources are usually related to wastewaters from the dying,printing and textile industries. Since the need for their removalfrom polluted water is widely recognized, a variety of methodologiesand treatments have been researched. Among them, water remediationthrough adsorption processes is considered a promising alternativefrom costs, operational complexity and reusability points of view.Adsorbents should be as green as possible and at the same time theyshould be able to perform an efficient water treatment.Theauthors have previously prepared and studied magnetic polyvinylalcohol (PVA) hydrogels that were capable of removing methylene blue(MB) from aqueous model systems. However, the materials werecompletely incapable of removing anionic dyes. Then, in the verybeginning of this investigation, the authors desired to employsimilar starting materials and to change the magnetic nanoparticles(MNPs) content. Then, magnetic beads were generated instead ofmagnetic films, looking for increasing the contact surface betweenthe adsorbent and the polluted solution. As a result, the developedmaterials were completely characterized and tested as both cationic(MB) and anionic (methyl orange, MO) dyes adsorbents from aqueousmodel solutions conveniently prepared. The obtained magnetic beadsexhibited self-oriented TillandsiaAeranthos-likeflowers and porous spheres both being composed by iron oxides (Figure1). Even though other researchers have prepared this kind of ironoxide-based nanomaterials, it is important to remark that they werenot formed inside a polymeric matrix. Itwas observed that the efficiency towards the removal of MB (> 80%)is higher than the corresponding to MO (< 30%), but it is possibleto affirm that the magnetic materials have certain versatility to actas adsorbents. p { margin-bottom: 0cm; direction: ltr; line-height: 100%; text-align: center; orphans: 2; widows: 2; background: transparent }p.western { font-family: "Times New Roman", serif; font-size: 14pt; so-language: en-GB; font-weight: bold }p.cjk { font-family: "Times New Roman"; font-size: 14pt; so-language: de-DE; font-weight: bold }p.ctl { font-family: "Times New Roman"; font-size: 12pt; font-weight: bold }a:link { color: #0000ff; text-decoration: underline }