My project have solve many problems which are listed below:- 1) synthesis of silver nanoparticles can be done by using physical and chemical methods but they are harmful and cost effective so in my project synthesis is done by using biological method (using neem leaf extract) which is not hazards to environment. 2) In many synthesis process prepared silver nanoparticles are not stable for long time, differ in size and shape, they got agglomeration after some time but in our project the prepared silver nanoparticle stable, uniform in size, shape and highly crystalline in nature. it is because of the presence of capping agent in solution and it is confirmed by XRD & FESEM analysis . 3)waste dye, which is used for colouring of fabric is mixed with water and contaminate it. so waste water can't be used again. in this project synthesized silver nanoparticles successfully degrade the methylene blue dye(toxic dye)from water.
The Bio-synthesis of silver nanoparticle has been carried out by using Azadirachta Indica leaf extract by microwave irradiation method. This microwave irradiation method of synthesis is rapid which converted silver salt into silver nanoparticles within few minute under the presence of leaf extract of A. Indica. The change in colour of aqueous solution of silver nitrate from colourless to brown colour confirmed the formation of silver nanoparticles. The resultant synthesized silver nanoparticles are characterized by various techniques, such as, UV-Vis Spectroscopy, Fourier Transform Infrared Spectroscopy, X-ray diffraction and Field Emission Scanning Electron Microscopy. The individual plasmonic band at 440 nm in UV-Vis absorbance spectra confirm the formation of silver nanoparticles. The FTIR spectra revealed that, the polyphenolic content present in leaf extract of A. Indicia is responsible for reduction of silver salt and protein might be act as capping and stabilizing agent in order to prevent the aggromerization of synthesized silver nanoparticles. Moreover, the XRD spectrum revealed that the synthesized silver nanoparticles are pure and highly crystalline in nature, the diffraction peaks detected at angle (2θ), i.e., 38.80°, 45.20°, 66.10°, 78.70° and 82.3° respectively, have been indexed as (111), (200), (220), (311) and (222) bragg reflection plane, respectively. These diffraction peaks confirm the synthesized silver nanoparticles have face cantered cubic (FCC) structure and the calculated average size of silver nanoparticles is about 18 nm. In order to confirm the shape and surface morphology of synthesized silver nanoparticles, the FESEM images is recorded and these images display the synthesized silver nanoparticles are spherical in shape and are highly crystalline. Furthermore, the synthesized silver nanoparticles are used as photocataysts for catalytic degradation of Methylene blue (MB) dye from aqueous solution. The photocatalytic degradation of MB dye from its aqueous solution is studied at different exposure time to mercury lamp radiation and at different concentration of suspension of synthesized silver nanoparticles. From the UV-Vis spectra it can be concluded that, the concentration of MB dye decreases on increasing the concentration of synthesized silver nanoparticles in aqueous solution of MB dye and also decrease with the increase in exposure time of radiation. Hence, the present studies explore the possibility to utilize biosynthesized silver nanoparticles as photocatalyst in degradation of MB dye from aqueous solution. It is expected that, the synthesized silver nanoparticles are effective photocatalyst for degradation of MB dye and also play an important role in environment protection.
Link: this project have many unique features:
1)fast synthesis process (less than 3 min)
2)prepared silver nanoparticles are not toxic and can be used for biological application.
3) no use of any hazardous chemical in synthesis process.
4) synthesis process is environment friendly and cost effective.
5) prepared silver nanoparticles can be stored for long time.
6) successfully degrade toxic dye from water and made water reusable.
Problem Scale: Worldwide
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