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Ared SA/PVP/TiO2 nanocomposite beads advocate their use as efficient, eco-friendly supplies for the treatment of wastewaters contaminated with cationic dyes. Search phrases: hydrogel nanocomposite beads; sodium alginate; polyvinylpyrrolidone; cationic dye; photodegradationCitation: Elessawy, N.A.; Gouda, M.H.; Elnouby, M.S.; Zahran, H.F.; Hashim, A.; Abd El-Latif, M.M.; Santos, D.M.F. Novel Sodium Alginate/Polyvinylpyrrolidone/TiO2 Nanocomposite for Efficient Removal of Cationic Dye from Aqueous Remedy. Appl. Sci. 2021, 11, 9186. https://doi.org/10.3390/app11199186 Academic Editor: Adina Magdalena Musuc Received: 6 September 2021 Accepted: 30 September 2021 Published: 2 OctoberPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations.1. Introduction The release of dye-contaminated wastewaters from different industries [1] into the environment (S)-(-)-Phenylethanol Description results in dramatic effects on the living life of our planet, as dyes and their sub-products are usually toxic or mutagenic agents [2]. Diverse tactics are applied to treat waters polluted with dyes, such as adsorption [3,4], photocatalysis [5], biological strategies [6,7], coagulation, and flocculation [8]. Lately, photocatalysis degradation has been utilised broadly to remove several organic [9] and inorganic [10] wastewater contaminants by transforming them into nonhazardous supplies. Among the semiconductor materials most typically utilized as a photocatalyst to take away many contaminants from wastewaters is titanium dioxide (TiO2 ), which was studied as a photocatalyst for the initial time in 1972 by Fujishima and Honda [11]. TiO2 is actually a non-toxic and bio-friendly material, chemically stable, photostable, commerciallyCopyright: 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access post distributed under the terms and conditions from the Inventive Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).Appl. Sci. 2021, 11, 9186. https://doi.org/10.3390/apphttps://www.mdpi.com/journal/applsciAppl. Sci. 2021, 11,2 ofavailable having a low cost cost, has high transparency to visible light, and may be activated with sunlight or UV radiation [12,13]. The problem with regards to the application on an industrial scale of TiO2 nanostructures could be the low adsorption of organic pollutants, uniform distribution of nanoparticles, and also the sluggish separation and recovery of nanosized particles during the method of wastewater therapy. Supporting TiO2 nanostructures on a polymeric matrix can overcome this difficulty. TiO2 incorporated into a calcium (Ca)-alginate film matrix was utilized as a photocatalyst to eliminate methyl orange with 82.two effectiveness right after 120 min of UV irradiation [14]. ZnO and TiO2 nanoparticles embedded into Ca-alginate beads were also used as a photocatalyst to remove copper ions [10]. By utilizing cross-linked sodium alginate (SA) with TiO2 , forming a SA iO2 hydrogel, an adsorption efficiency for methyl violet dye of 99.six was reported, whereas SA-based film only achieved 85 . This impact was attributed for the electrostatic attraction among the methyl violet dye and TiO2 , which behaves as an anionic center in the hybrid hydrogel [15]. However, soon after two cycles of reuse, the SA iO2 hybrid film was nonetheless efficient in degrading Congo red under UV light, with no appreciable loss of catalytic activity [16]. Normally, adsorption-photocatalytic degradation of dyes is favored u.