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1. Synthesis and Characterization of NiO /g-C 3 N 4 /GO by Hydrothermal method for Photocatalytic degradation of Methylene blue Submitted By SINDHU K 20MTS363 M.Tech in Material Science

2. Introduction Hydrothermal method Materials and methodology Characterization of Nio /g-C3N4/GO Results and discussion Conclusion Table of contents

3. Nanomaterials describe in principle materials of which a single unit small sized between 1 and 100 nm. Nanocomposites are materials that incorporate nanosized particles into a matrix of standard material. Nickel oxide ( NiO ) as a p-type semiconductor, possesses super hole mobility, high cost effectiveness and high lattice match with graphitic carbon nitride(g-C3N4). The p-n heterojunction can produce more efficient electrons to participate in the reaction. Introduction

4. Hydrothermal Method

5. For synthesis of the NiO /g-C3N4/go photocatalyst , Firstly, GO was synthesized from natural graphite powder by a Hummer's method. 0.13 g of GO was dispersed in 100 mL distilled water by using ultrasonication device for half an hour. Secondly, 2.6g of Ni(NO3)2 and 2.3g of g-C3N4 were dissolved in 60mL distilled water and allowed for stirring for one hour, then the former one was added slowly to the latter while stirring and allowed for half an hour, then NaOH was added dropwise until it reached 7 pH. The mixture was loaded into Teflon liner hydrothermal and heated at 180˚C for 24h. The resulting product was washed with distilled water and ethanol for several times, and dried at 60˚C in vacuum oven for 8 hours. Materials and methodology

6. (a) (d) (c) (b) XRD pattern of NiO / g-C 3 N 4 /GO EDS of NiO / g-C 3 N 4 /GO SEM images of NiO / g-C 3 N 4 /GO DLS of NiO / g-C 3 N 4 /GO

7. (a) (b) BET of NiO / g-C 3 N 4 /GO FT-IR of NiO / g-C 3 N 4 /GO

8. (a) (b) Photocatalytic degradation of methylene blue

9. Photo Irradiatio n Recombination Excitation Reduction process Oxidation process H 2 O O 2 H 2 H +             VB CB Methylene blue (MB) dye MB dye degradation @ 40 min

10. UV/Vis Spectra for degradtion of methylene blue(MB) under visible light irradiation over the Nio /g-C 3 N 4 /GO 663nm Reusibility

11. The nanocomposite NiO /g-C3N4/GO with different weight percent of GO using the hydrothermal method. The synthesized nanocomposites are characterized by XRD, FTIR, SEM, UV-Vis analytical techniques. Photocatalytic activity of the visible light driven photocatalysts is evaluated by the degradation of methylene blue(MB) aqueous solution at room temperature. The result demonstrated that the weight percent of graphene oxide had remarkable influence on the degradation reaction. The enhanced photocatalytic activity of the nanocomposite with 0.1% of GO is attributed z scheme charge transfer mode , resulting in a more effective separation of photogenerated electron-hole pairs. The reusability of the nanocomposite is confirmed after five consecutive runs. Conclusion:

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