Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Journal of Physics: Theories and Applications Jurnal Ilmu Fisika
Utari Utari
Sebelas Maret University
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology Physics

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Study of co-precipitated nanomaterials magnetic MnxCo1-xFe2O4 (with x = 0.50 & 0.75) for Photocatalyst Application in MB degradation Wahid Sidik Sarifuddin; Utari Utari; Budi Purnama
Journal of Physics: Theories and Applications Vol 4, No 1 (2020): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v4i1.40350

Abstract

The crystalline structure and magnetic properties of Mn1-xCoxFe2O4 (x = 0 & 0.25) was studied in this report. The ferrite materials were synthesized by the chemical co-precipitation method and calcinated at 1000oC for 5 hours. The obtained materials were characterized by FTIR, XRD and VSM, and for photocatalytic activity was measured by UV-Vis spectrometer. Vibration bands at tetrahedral and octahedral site were corresponded by  = 581.56 cm-1 and  = 465.83 cm-1 and 474.51 cm-1 . The obtained ferrite were confirmed by XRD as spinel structure and shown that the addition of number of Mn decreased crystallite size (D) and x-ray density (ρx), but lattice constants (a) increased. The crystallite size of samples with x = 0.50 was 34.85 nm, and x = 0.75 was 32.17 nm. The magnetic properties of nanoparticles shown that magnetization saturation (Ms)from 42.05 emu/g to 54.16 emu/g increased with the addition of number of Mn. The coercive field (Hc)decreased from 408.27 Oe to 258.37 Oe. Photocatalytic activity was observed by UV-Vis spectrometer, where percentage of MB degradation (E) increase with the addition of number on Mn from 49.08% to 69.06%, either rate constant (kapp) and half life time (t1/2).  Furthermore, ferrite material base Mn-Co-ferrite has good characteristic to applied for photocatalyst.
Photocatalytic Properties of Co-precipitated Bismuth Cobalt Ferrite Abi Catur Saputri; Nurdiyantoro Putra Prasetya; Utari Utari; Budi Purnama
Jurnal Ilmu Fisika Vol 14 No 2 (2022): September 2022
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jif.14.2.116-123.2022

Abstract

Bismuth substituted cobalt ferrite nanoparticle is studied for photocatalytic in this paper.  Bismuth cobalt ferrite has been synthesized by the coprecipitation method and low-temperature annealing treatment. The characterization results showed that the XRD spectral pattern is consistent with ICDD 221086. The crystallite size of bismuth cobalt ferrite increases with increasing annealing temperature. FTIR results confirm the available metal-oxide at number wave around 570/cm and 475/cm which is the appearance of octahedral and tetrahedral sites owing cobalt ferrite. The photocatalyst test was carried out by varying the catalyst mass and UV irradiation time. The absorption spectrum decreases with increasing catalyst mass. The increase in UV irradiation time causes the formation of more holes (h+) and electrons (e-). So that the hydroxide reaction occurs that produces free radicals. The results of this study indicate that cobalt ferrite-based nanoparticles have potential as photocatalyst materials.
Co-Authors Abi Catur Saputri Budi Purnama Prasetya, Nurdiyantoro Putra Wahid Sidik Sarifuddin