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Erwin Amiruddin
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Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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PENGARUH DOPING CHROMIUM TERHADAP SIFAT KRISTALINITAS DARI NANOPARTIKEL α-Fe2O3 (HEMATITE) Novia Magdalena Purba; Erwin Amiruddin; Salomo Sinuraya; Krisman Sabar
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.141-146

Abstract

This study aims to determine the crystal structure and particle composition as well as the effect of iron oxide nanoparticles (α-Fe2O3) doped chromium for methylene blue degradation. Iron oxide nanoparticles were obtained by 3 stages of ball milling with the total time milling of 120 hours. Each stage of ball milling, the product was process by strong NdFeB magnet uin order to separate between iron oxide and non iron oxide phases. The last product of ball milling process is called BM 3. The BM 3 product was divided into 4 parts with the same amount of weight namely BM 3A, BM 3B, BM 3C, and BM 3D with variations in the concentration of 0 wt.% chromium; 5 wt.%; 10 wt.%; and 20 wt.% These samples were characterized using X-ray diffraction (XRD) method and X-ray fluorescence (XRF). The XRD measurements show that the BM 3 product has a Hematite (α-Fe2O3) phase with a Rhombohedral structure. The crystal size of the samples decreases with increasing chromium concentration. The amount of Fe decreases from 57.316% to 54.204% as  chromium increases from 0 wt.% to 5 wt.% respectively. Meanwhile, the percentage of Cr increases before being doped with 0.08% chromium and then increases after being doped with 5 wt.% chromium to 7.758%.
PREPARASI NANOPARTIKEL OKSIDA BESI BERBASIS PASIR ALAM LOGAS DIDOPING KOBALT SEBAGAI MATERIAL LINGKUNGAN Erwin Amiruddin; Amir Awaluddin; Muhammad Rizki
Indonesian Physics Communication Vol 20, No 3 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.3.293-300

Abstract

The  cobalt  doped  iron oxide  nanoparticles  have  been  prepared  by  ball  milling  method  using  Logas natural sand as a raw material. The milled iron oxide nanoparticles were doped using cobalt with concentration of 0, 5, 10, 15,  and  20  wt.%.  The  structural, magnetic and  optical properties  were  studied  using  X-ray diffractometer (XRD), vibration sample magnetometer (VSM), and UV-Vis  spectroscopy, respectively. The samples  show  cobalt-hematite  nanoparticles  as  indicated  through  XRD  measurement.  The  XRD measurements  confirmed  the  formation  of  crystalline,  rhombohedral  crystal  structure  and  hematite  nanoparticles.    The  average  crystallite  size calculated using Scherrer formula found to be 38.51, 35.67, 33.75, 32.73, and 31.53 nm after being doped with cobalt 0, 5, 10,  15,  and  20  wt. %,  respectively. The samples  exhibited  weak  ferromagnetic  behaviour  with  the  coercivity  ranged from  124  Oe  to 299  Oe.  The optical properties strongly depend on cobalt  content  and  showed  that  the  band  gaps  of  cobalt  doped  hematite  decrease  with  increasing  cobalt  content.  This work suggests that the prepared iron oxide nanoparticles are attractive photo Fenton catalysts for the degradation of methylene blue in the water.
Co-Authors Amir Awaluddin Krisman Sabar Muhammad Rizki Novia Magdalena Purba Salomo Sinuraya