Graphitic Carbon Nitride Based Composite Photocatalyst For Methylene Blue Dye Degradation In Aqueous Solution

Abstract

Design And Synthesis Of Artificial Photo Catalysts For Dye Removal From Wastewater Have Become One Of The Key Strategies To Acquire Treated Water As A Potential Solution To Global Energy And Environmental Problems. Because Of Its Unique Features, Graphitic Carbon Nitride (G-C3n4) Has Shown New Potential Uses In The Photocatalytic Field In Recent Years. However, The Photo Catalytic Efficiency Of Virgin G-C3n4 Is Limited By Its Low Surface Area, Narrow Visible Light Absorbance, And High Photo-Induced Electron-Hole Pair Recombination Rate. In This Thesis, A Simple Wet Impregnation Method Was Employed To Synthesize G-C3n4/Zno/Co3o4 Heterojunction Photocatalysts With Increased Light Absorbance, Surface Area, And Efficient Separation OfPhotogenerated Charge Carries. To Characterize The As-Prepared Samples, X-Ray Diffraction(Xrd), Scanning Electron Microscopy (Sem), Uv-Vis Diffuse Reflectance Spectroscopy, Photo luminescence Spectroscopy (Pl), Electrochemical Impedance Spectroscopy (Eis), Brunauer??Emmett?? Teller (Bet), And Fourier-Transform Infrared Spectroscopy (Ftir) Were Used. Xrd Confirms The Proper Phase Formation Of G-C3n4, Zno, And Co3o4. When G-C3n4 Is Formed Into AComposite, Its Surface Area Increases, And The Use Of Cellulose As A Template For The Synthesis OfZno And Co3o4 Results In Good Dispersion, Small Grain Size, And A High Specific Surface Area. The Measurement Of The Energy Band Gap Of A G-C3n4/Zno/Co3o4 Composite Showed Redshifted Optical Absorption To The Visible Range. The Pl Intensity Decreases Due To Heterojunction Creation, And This Pl Quenching Results In An Enhanced Rate Of Separation For Photogenerated Electron-Hole Pairs, As Also Seen By Eis. Under Visible-Light Irradiation, The Photocatalytic Activity Of The Gzc 3 Composites Was About 8.2, 3.3, And 2.5-Fold More Than That Of The G-C3n4, G-C3n4/Zno, And G C3n4/Co3o4 Samples. The Stability Experiment Revealed That Gzc-3 Demonstrates A Relatively Higher Photocatalytic Activity After 4 Recycles. Based On Mott?? Schottky Plots Of Energy Band Matching Within G-C3n4, Zno, And Co3o4, A Synergistic Dual Z-Scheme G-C3n4/Zno/Co3o4Photocatalyst May Be Created. The Developed Photocatalyst Could Efficiently Photodegrade MbDye. As A Result, The Eco-Friendly Photocatalyst Could Be Widely Used In The Treatment Of Dye Contaminated Wastewater.