| Titre : | Green Synthesis, Characterization and Photocatalytic dye Degradation Activity of ZnO Nanoparticles |
| Auteurs : | Maroua LAIB, Auteur ; Habiba Laraoui, Directeur de thèse |
| Type de document : | Mémoire magistere |
| Editeur : | Biskra [Algérie] : Faculté des Sciences Exactes et des Sciences de la Nature et de la Vie, Université Mohamed Khider, 2025 |
| Format : | 1VOL.(80.p) / ill.couv.ill.en coul / 30cm |
| Langues: | Anglais |
| Langues originales: | Anglais |
| Mots-clés: | Green synthesis, zinc oxide nanoparticles, plant extracts, Urtica dioica, Atriplex halimus, Equisetum arvense, Photocatalysis, Rhodamine B. |
| Résumé : |
This study presents a green, cost-effective synthesis of zinc oxide nanoparticles (ZnO NPs) using aqueous extracts of Atriplex halimus, Urticadioica, Equisetum arvense (horsetail), and their mixture as both reducing and stabilizing agents. Comprehensive characterization by X-ray diffraction (XRD), UV-visible spectroscopy (UV-Vis), and Fourier-transform infrared spectroscopy (FTIR) confirmed the successful formation of crystalline ZnO NPs with a hexagona wurtzite structure. Photocatalytic activity was evaluated through the degradation of rhodamine B dye under sunlight. Remarkably, ZnO NPs synthesized using horsetail extract and the mixture of all three extracts demonstrated superior photocatalytic efficiencies, achieving up to 97% dye removal within 180 minutes. |
| Sommaire : |
INTRODUCTION…………………………………………………………………………...…...3 I.1.Nanoscience and Nanotechnology ........................................................................................... 8 I.1.1. Definition of Nanoscience and Nanotechnology ............................................................. 8 I.1.2. History of Nanotechnology ............................................................................................... 9 I.2.Nanomaterials ......................................................................................................................... 10 I.2.1. Definition ......................................................................................................................... 10 I.2.2. Classification of nanomaterials ...................................................................................... 11 I.2.3. Properties of nanomaterials ........................................................................................... 12 I.2.3.1. Magnetic properties of nanomaterials ................................................................... 12 I.2.3.2. Optical properties of nanomaterials ....................................................................... 13 I.2.3.3 Electrical properties of nanomaterials .................................................................... 13 I.2.3.4. Chemical properties of nanomaterials ................................................................... 13 I.2.3.5. Mechanical properties ............................................................................................. 13 I.2.4. Synthesis methods of nanomaterials ............................................................................. 14 I.2.5. Applications of Nanomaterials ....................................................................................... 14 I.2.6. Toxicity of Nanomaterials............................................................................................... 16 I.3. Overview of the selected plants ............................................................................................. 17 I.3.1. Urtica dioica species ........................................................................................................ 17 I.3.1.1. Description of the plant ........................................................................................... 17 I.3.1.2. Botanical classification of Urtica dioica.................................................................. 18 I.3.1.3. Phytochemical composition of the plant ................................................................ 18 I.3.1.4. Uses and Medicinal properties ................................................................................ 19 I.3.1.5. Toxicity of the plant ................................................................................................. 19 I.3.2. Atriplex halimus species .................................................................................................. 20 I.3.2.1. Description of the plant ........................................................................................... 20 I.3.2.2. Botanical classification of Atriplex halimus ........................................................... 20 I.3.2.3. Phytochemical composition of the plant ................................................................ 21 I.3.2.4. Traditional uses and Medicinal properties ............................................................ 22 I.3.2.5. Toxicity of the plant ................................................................................................. 22 I.3.3. Equisetum arvense species .............................................................................................. 22 I.3.3.1. Description of the plant ........................................................................................... 22 I.3.3.2. Botanical classification of Equisetum arvense ....................................................... 23 I.3.3.4. Traditional uses and Medicinal properties ............................................25 I.3.3.5. Toxicity of the plant ................................................................................................. 25 References ...................................................................................................................................... 26 II.1. Overview of ZnO NPs .......................................................................................................... 35 II.2. Properties of ZnO NPs and Their Importance .................................................................. 35 II.3. Green Synthesis of ZnO NPs ............................................................................................... 37 II.3.1. Biosynthesis of ZnO NPs using plant extracts ............................................................ 37 II.3.2. Pathways and Mechanisms of ZnO NPs Formation .................................................. 39 II.3.3. Synthesis Parameters Affecting Plant-Mediated ZnO NPs ....................................... 40 II.3.4. The advantages and disadvantages of green synthesis of ZnO NPs ......................... 40 II.4. Applications of ZnO NPs ..................................................................................................... 41 II.5. Photocatalysis........................................................................................................................ 42 II.5.1. Dyes and Wastewater Treatment Technologies ........................................................... 42 II.5.2. Photocatalytic Mechanism of ZnO NPs....................................................................... 42 II.5.3. Photocatalysis Activity of Plant-Mediated ZnO NPs ................................................. 45 II.6. Nanoparticles characterization ........................................................................................... 45 II.6.1. Analysis of Fourier-Transform Infrared Spectroscopy (FTIR) ................................ 45 II.6.2. Analysis of UV-Vis ......................................................................................................... 46 II.6.3. Analysis of X-ray Diffraction (XRD) ........................................................................... 48 References ..................................................................................................................................... 49 III.1. Study Overview ................................................................................................................... 56 III.2. Green synthesis of ZnO NPs .............................................................................................. 57 III.2.1. Materials and Product ................................................................................................. 57 III.2.2. Preparation of plant extracts ...................................................................................... 57 III.2.3. Green synthesis of ZnO using plant extracts ............................................................. 59 III.3. Photocatalytic ZnO NPs application (Rhodamine B degradation study by synthesized ZnO NPs) ...............................61 III.3.1. What is Rhodamine B .................................................................................................. 61 III.3.2. Photocatalytic evaluation ............................................................................................ 62 References ...................................................................................................................................... 63 Ⅳ.1. ZnO Nanoparticles characterization ................................................................................. 65 Ⅳ.1.1. Analysis of Fourier-Transform Infrared Spectroscopy (FTIR) ............................... 65 Ⅳ.1.2. Analysis of XRD ................68 Ⅳ.1.3. Optical characterization by UV-Visible Analysis .............................72 Ⅳ.2. Photocatalytic ZnO NPs evaluation...................73 References .............................78 CONCLUSION………………………………………………………………………………79 ABSTRACT……………………………………………………………………………………80 |
Disponibilité (1)
| Cote | Support | Localisation | Statut |
|---|---|---|---|
| MCH/676 | Mémoire master | bibliothèque sciences exactes | Consultable |
