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Green synthesis of silver particles at room temperature using gynura procumbens aqueous extract

Green synthesis of silver particles at room temperature using gynura procumbens aqueous extract / Khairunisa Hat
Kajian ini memberi tumpuan kepada biosintesis nanopartikel perak menggunakan ekstrak Gynura procumbens sebagai agen penurunan dan penstabilan. Apabila ion perak akueus terdedah kepada ekstrak daun, ia akan diturunkan dan menghasilkan perubahan warna menandakan pembentukan nanopartikel perak. Partikel perak yang usdah disintesis akan disifatkan dengan menggunakan Spektroskopi UV-Vis, Spektroskopi Infra-merah Penjelmaan Fourier, Mikroskop Elektron Pancaran dan Analisis Keupayaan Zeta teknik. Spektrum UV-Vis yang dihasilkan oleh media akueus mengandungi nanopartikel perak sebagai fungsi masa tindak balas menunjukkan peningkatan secara beransur-ansur pada ketumpatan puncak Permukaan Gema Plasmon pada 449 nm hingga 452 nm. Beberapa parameter, sebagai contoh ratio isipadu ekstrak tumbuhann kepada argentum nitrat, kepekatan dan kepekatan argentum nitrat juga dikaji dan menunjukkan julat jarak gelombang yang sama pada penyerapan maksimum. Absorbans tertinggi, 1.75 didapati selepas 4 hari menggunakan 12 mM argentum nitrat bertindak balas dengan 5% ekstrak tumbuhan dalam ratio 1:50. Analisis Keupayaan Zeta membuktikan kestabilan nanopartikel perak dengan mempunyai nilai -40mV . Spektroskopi Infra-merah Penjelmaan Fourier menunjukkan bahawa nanopartikel perak dilitupi oleh pelbagai molekul protein. Mikroskop Elektron Pancaran memastikan bahawa nanopartikel adalah berbentuk sfera. _______________________________________________________________________________________________________ This study focuses on biosynthesis of silver nanoparticles using Gynura Procumbens leaf extract as reducing and stabilizing agents. Aqueous silver ions when exposed to plant leaf extract were reduced and resulted in a colour change indicating the formation of silver nanoparticles. The synthesized silver nanoparticles were characterized by UV-Vis Spectroscopy, Fourier Transform Infra-red Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM) and Zeta Potential Analysis techniques. The UV-Vis spectrum of aqueous medium containing silver nanoparticles as a function of time of reaction showed gradually increasing surface Plasmon resonance peak intensity at 449 nm to 452 nm of silver. A few parameters for examples volume ratio of plant extract to silver nitrate, plant extract concentration, silver nitrate concentration are also have been studied and shows the same range of wavelength at maximum absorption. The highest absorbance, 1.75 was obtained after 4 days using 12mM silver nitrate react with 5% plant extract in ratio of 1:50. Zeta Potential Analysis proves silver nanoparticles’s stability by having the value -40mV. FTIR spectroscopy analysis showed that silver nanoparticles are capped by various protein molecules. Transmission Electron Microscopy confirmed the spherical shape of nanoparticles.
Contributor(s):
Khairunisa Hat - Author
Primary Item Type:
Final Year Project
Identifiers:
Barcode : 00003107142
Accession Number : 875007262
Language:
English
Subject Keywords:
biosynthesis; silver nanoparticles; Gynura Procumbens leaf extract
First presented to the public:
6/1/2017
Original Publication Date:
4/24/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Chemical Engineering
Citation:
Extents:
Number of Pages - 60
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-04-24 12:28:51.878
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Mohd Jasnizam Mohd Salleh

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Green synthesis of silver particles at room temperature using gynura procumbens aqueous extract1 2018-04-24 12:28:51.878