![]() Nous avons employe de nombreuses techniques analytiques, telles que la microscopie electronique a balayage, la diffraction des rayons X, la spectroscopie FTIR et la methode BET, pour caracteriser le ZnO/RC. Presentant une meilleure stabilite, le ZnO/RC resiste au changement de pH (de 3 a 9). Le procede consiste a produire un acide de Lewis a la surface du ZnO pour attirer toute base de Lewis, telle que le BM (). Les nanoparticules de ZnO que nous avons modifiees en couvrant leur surface de colorant a base de rouge Congo (RC) seront designees ZnO/RC. ![]() Resume: Cette recherche a pour but d'utiliser des nanoparticules de ZnO modifiees pour augmenter le taux d'elimination de colorant a base de bleu de methylene (BM). Key words: ZnO/CR, methylene blue, nonlinear kinetics, H bonding, Lewis acid-base interaction. Furthermore, the removal of the MB by ZnO/CR powder worked well as a chemical and physical adsorption process. The rate of adsorption was controlled mainly by a Lewis acid-base interaction and H bonding. The uptake process of the MB occurs spontaneously following endothermic process and an increase in the system disorder. Thermodynamic parameters, , and were investigated at four temperatures (10, 20, 30, and 40 C). The adsorption process of the MB followed the Langmuir model with a maximum capacity () value of 43.5 mg/g This value is six times greater than the value calculated with pure ZnO. The intraparticle diffusion equation was used to study the diffusion process. The best-fit kinetic equation was investigated using three functions of error analysis: the sum of the squares of the errors, chi-square analysis, and the coefficient of determination. Nonlinear and linear regressions of pseudo first-order, pseudo second-order, and Elovich models were used to calculate the kinetic parameters of the adsorption process. Several analysis techniques such as scanning electron microscopy, X-ray diffraction, FTIR, and BET method were used to characterize ZnO/CR. Therefore, the stability of ZnO/CR improved, and it resists the change in pH value (from 3 to 9). ![]() This process is used to produce a Lewis acid on the surface of ZnO to attract any Lewis base such as a MB dye (). ZnO nanoparticles are modified by coating their surface with Congo red (CR) dye, henceforth referred to as ZnO/CR. Abstract: This research aims to use modified ZnO nanoparticles to enhance the removal rate of the methylene blue (MB) dye. ![]()
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