TY  - THES
N1  - Didik Krisdiyanto, S.Si., M.Sc. dan Ir. Moch. Setyadji, M.T.
ID  - digilib75480
UR  - https://digilib.uin-suka.ac.id/id/eprint/75480/
A1  - Naiya Yuan Arlita, NIM.: 22106030031
Y1  - 2026/01/19/
N2  - Cerium (Ce) is one of the rare earth elements that exhibits distinctive redox behavior between Ce³? and Ce??, making it suitable for selective separation through oxidation and precipitation processes. This study aims to optimize the oxidation process of cerium from rare earth hydroxide (REOH) concentrates and to compare the characteristics of cerium precipitates before and after oxidation treatment based on X-Ray Fluorescence (XRF), Fourier Transform Infrared Spectroscopy (FTIR), and X-Ray Diffraction (XRD) analyses.
XRF analysis results indicate that the initial REOH concentrate contains 36.27% cerium, confirming cerium as the dominant element in the raw material. The oxidation process was conducted using potassium permanganate (KMnO?) with variations in pH and oxidant dosage. The sample without oxidation treatment produced a cerium content of 32.148% with a recovery of 51%. In contrast, the oxidized samples showed a significant improvement, where the optimum condition was achieved at pH 2 with the addition of 1.25 g KMnO?, resulting in the highest cerium content in the precipitate of 70.47%, accompanied by a decrease in impurity elements such as La and Nd and an increase in cerium recovery up to 94%.
FTIR analysis shows that the non-oxidized sample is dominated by O?H stretching bands around 3400 cm?¹, whereas the oxidized sample exhibits a characteristic Ce?O vibration band in the range of 500?600 cm?¹ with higher intensity. XRD analysis reveals that the sample without oxidation treatment does not form a single crystalline phase but instead consists of two crystalline phases, namely Ce?O? and a partial CeO? phase. This indicates that, under non-
oxidizing conditions, cerium exists in a mixed oxidation state of Ce(III) and Ce(IV), likely due to partial oxidation by dissolved oxygen or air during the precipitation and drying processes. Conversely, the XRD pattern of the oxidized sample shows prominent diffraction peaks at 2? values of approximately 28.5°, 33.1°, and 47.5°, corresponding to the (111), (200), and (220) crystal planes of CeO? with a cubic (fluorite) crystal structure. The dominance of the CeO? phase confirms that oxidation using KMnO? successfully converts reduced cerium species into thermodynamically more stable cerium(IV).
PB  - UIN SUNAN KALIJAGA YOGYAKARTA
KW  - Serium
KW  -  CeO?
KW  -  Oksidasi
KW  -  Recovery
KW  -  KMnO?
M1  - skripsi
TI  - PENGARUH VARIASI pH DAN KONSENTRASI KALIUM PERMANGANAT (KMnO?) TERHADAP EFEKTIVITAS PEMISAHAN SERIUM (Ce) DARI KONSENTRAT LOGAM TANAH JARANG HASIL OLAH MONASIT
AV  - restricted
EP  - 93
ER  -