Muzakky Muzakky(1*), Sri Juari Santosa(2)

(1) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Sekip Utara, Yogyakarta 55281
(2) Chemistry Department, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta 55281
(*) Corresponding Author


The calculation experiments of adsorption capacities of Th-232 and U-238 in γ- Al2O3-humate at single system and competitive with Freundlich method has been done. The purpose of the research is (1) to characterize γ- Al2O3-humat functional groups, (2) to know γ- Al2O3-humat solubility and (3) to predict adsorption capacities of U-238 and of Th-232 at adsorbent γ-Al2O3-humate. The characterization of functional groups γ- Al2O3-humate is done by Fourier Transform Infra red (FTIR) Spectrometry. Based on perception results of functional spectra characteristic of γ-Al2O3-humate is similar with humic substance with decrease at stretching -OH at 3400 - 3300 cm-1, and C=O stretching of COOH spectra, C=C aromatic or hydrogen bond of C=O at 1725-1720 cm-1spectra. The solubility testing of γ-Al2O3-humate indicated that the compound it's effective used as adsorption U-238 and of Th-232 at pH 1 to 4 conditions. At single adsorption system with 1000 mg/L of U-238 or Th-232 feed, 0.001 g up to 0.1 g weight of γ-Al2O3-humate were got for U-238 balanced to 992.15 mg/L and 980.66 mg/L for Th-232.  By using regression line curve between ln C and ln x/m, adsorption capacities of U-238 and Th-232 at single system can be calculated as 3.63 mg/g and 2.93 mg/g, respectively, while adsorption capacity of Th-232 was increases to 8.08 mg/g and U-238 decreases to 0.91 mg/g at competitive system.


U-238; Th-232; adsorption Freundlich; Spectrometry Fourier Transform Infra Red

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Indonesian Journal of Chemistry (ISSN 1411-9420 /e-ISSN 2460-1578) - Chemistry Department, Universitas Gadjah Mada, Indonesia.

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