Surface modification of TiO₂/ZnO nanoparticles by organic acids with enhanced methylene blue and rhodamine B dye adsorption properties

Abstract

The possible chemical modification of TiO2/ZnO with lactic acid and oxalic acid.

PLA-ZnO/TiO2 Nanocomposite Obtained by Ultrasound-Assisted Melt-Extrusion for Adsorption of Methylene Blue

“…A shorter contact time allows efficient removal of contaminants when they are found in a treatment facility that receives large volumes of water [ 38 ]. The nanoparticles ZnO/TiO 2, unmodified and modified with lactic acid, showed 67 and 85% adsorption efficiency for methylene blue dyes in a time of 12 min, as reported in a previous study [ 23 ]. When these nanoparticles are incorporated as nanofillers in the PLA matrix, the percentage of adsorption efficiency increases.…”

“…The PZT 0.75%, PZT 1.5%, and PZT 2% samples presented lower temperature values at 10 and 50% weight loss compared to the polymer alone. This faster decomposition phenomenon is the reason for the evaporation of the carboxyl group, because the amount of functional groups that were present in the modified samples was around 43% [ 23 ].…”

“…For the formation of the nanocomposites, the ZnO/TiO 2 nanoparticles are chemically modified with carboxylic groups. In a previous study by the authors, the lactic acid modification of these nanoparticles was chosen due to the 43% modification [ 23 ].…”

“…In a previous study, the adsorption of dyes in nanoparticles alone was reported [ 23 ]. In this work, the nanocomposite with a biodegradable matrix was reported using these nanoparticles.…”

“…The surface modification of ZnO/TiO 2 with lactic acid by ultrasound energy followed the protocol of Andrade-Guel et al The reaction time for the modification was 90 min [ 23 ].…”