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ITS » Undergraduate Theses » Teknik Kimia
Posted by setiawan04@its.ac.id at 27/05/2010 10:04:17  •  1211 Views


FUNGSIONALISASI PERMUKAAN MAGNETITE DENGAN PENAMBAHAN SODIUM SILICATE PADA SINTESIS PARTIKEL MAGNETITE SECARA ELEKTROKIMIA

SODIUM SILICATE FUNCTIONALIZATION OF MAGNETITE SURFACE ON THE MAGNETITE NANOPARTICLE SYNTHESIS USING ELECTROCHEMICAL METHOD

Created by :
UTOMO, RATIH YANITA  ( 2305100070 )
KARTIKASARI



SubjectElektrokimia
Alt. Subject Electrochemistry
Keywordelektrokimia
magnetite
nanopartikel magnetik
mekanisme
XRD
SEM
TEM
VSM

Description:

Tujuan dari penelitian ini adalah mensintesis partikel magnetite (Fe3O4) bersalut silika dengan metode elektrokimia, mempelajari pengaruh konsentrasi sodium silicate dan tegangan listrik yang diberikan terhadap pembentukan partikel magnetite, mengetahui kinetik reaksi yang terjadi selama sintesis, dan mengetahui apakah partikel magnetite bersalut silika masih dapat mengikat gugus fungsi senyawa lain. Sintesis partikel magnetite ini diawali dengan proses pelapisan besi menggunakan metode elektrolisis. Kami menggunakan larutan elektrolit FeSO4 0,072 M pada rapat arus 0,167 A/dm2 di dalam bejana acrylic. Plat besi ditempatkan sebagai katoda sedangkan untuk anodanya dipakai elektroda inert yaitu platina. Selanjutnya plat besi hasil pelapisan digunakan sebagai anoda dan plat besi tanpa pelapisan sebagai katoda pada sintesis magnetite menggunakan elektrolit sodium silicate yang dilarutkan dalam demineralized water. Elektroda dipasang secara paralel dengan jarak 2 cm. Sintesis dilakukan dengan tegangan bervariasi, dari 10 V sampai 20 V dan konsentrasi sodium silicate dalam demineralized water dari 100 ppm sampai 580 ppm pada suhu kamar. Produk yang dihasilkan disaring dan dikeringkan untuk dianalisis dengan X-Ray Diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), metode Brunauer-Emmett-Teller (BET), dan Vibrating Sample Magnetometer (VSM). Di dalam penelitian ini dipelajari dinamika sel elektrokimia yang terjadi selama pembentukan Fe3O4 dengan mengukur perkembangan arus listrik yang mengalir, kurva η terhadap i, dan Tafel plot. Selanjutnya, untuk memfungsionalisasi partikel, kami menambahkan larutan asam sitrat 0,25 M pada produk, lalu mengocok dengan orbital shaker pada kecepatan rendah selama 20 menit, kemudian disaring dan dikeringkan. Sintesis partikel magnetite bersalut silika dapat dilakukan dengan metode elektrokimia dengan kemurnian produk yang tinggi, berukuran di bawah 15 nm, dan tidak memiliki kecenderungan teraglomerasi. Konsentrasi sodium silicate dan tegangan listrik yang diberikan berpengaruh pada crystallinity dan ukuran magnetite. Produk yang dihasilkan telah siap untuk difungsionalisasi dengan gugus senyawa lain yang dibutuhkan.


Alt. Description

The objectives of this research are to synthesize silica-coated magnetite particles using electrochemical method, to study the influence of sodium silicate concentration and DC voltage to the formation of magnetite nanoparticles, to study reactionís kinetics during synthesis, and to observe whether silica-coated magnetite nanoparticles are still able to attach other functional groups. The electrode used for the synthesis prepared by electrolysis. The electrolysis using 0.072 M FeSO4 solution with current density 0.167 A/dm2 in acrylic vessel. In this process, iron plate act as cathode and platinum act as anode. Then, electroplated iron-electrode functioned as anode and non-electroplated iron-electrode functioned as cathode in synthesis of magnetite using sodium silicate in demineralized water solution as electrolyte. Synthesis was performed in various voltage and sodium silicate concentrations at room temperature. Product was then isolated and analyzed using X-Ray Diffraction, Fourier Transform Infra Red, Scanning Electron Microscopy, Transmision Electron Microscopy, Brunauer-Emmett-Teller, and Vibrating Sample Magnetometer. Electrochemical cellís chemistry during synthesis was also examined with measuring real-time current per second, η vs i curve, and Tafel plot. To functionalize the particles, 0.25 M citric acid solution was added to a small amount of magnetite product. The mixture was shaked using orbital shaker in low speed for 20 minutes, then isolated. Silica-coated magnetite particles could be synthesized by electrochemical method, resulting pure product, below 15 nm in size, and low tendency to agglomerate. Sodium silicate concentration and voltage affect the crystal morphology and size of product. Silica-coated magnetite is then ready to be functionalized with required functional group.

Contributor:
  1. PROF.DR.IR. HERU SETYAWAN. M.ENG
Date Create:04/02/2010
Type:Text
Format:pdf
Language:Indonesian
Identifier:ITS-Undergraduate-3100010039491
Collection ID:3100010039491
Call Number:RSK 660.297 Uto f


Source :
Undergraduate Thesis, Chemical Engineering, RSK 660.297 Uto f, 2010

Coverage :
ITS Community

Rights :
Copyright @2010 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library


Publication URL :
http://digilib.its.ac.id/fungsionalisasi-permukaan-magnetite-dengan-penambahan-sodium-silicate-pada-sintesis-partikel-magnetite-secara-elektrokimia-10552.html




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SEM , TEM , VSM , XRD , elektrokimia , magnetik , magnetite , mekanisme , nanopartikel , nanopartikel magnetik



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