Abstract
Purification of raw bentonite was done to remove quartz. This includes mixing the raw bentonite with water and then centrifuge it at 750 rpm; this process is repeated until white purified bentonite is obtained. XRD, XRF, FTIR, and SEM techniques will be used for the characterization of purified bentonite. The sorption behavior of purified Jordanian bentonite towards and Th4+ metal ions in aqueous solutions was studied by batch experiment as a function of pH, contact time, temperature, and column techniques at 25.0∘C and pH = 3. The highest rate of metal ions uptake was observed after 18 h of shaking, and the uptake has increased with increasing pH and reached a maximum at pH = 3. Bentonite has shown high metal ion uptake capacity toward uranium(VI) than thorium(IV). Sorption data were evaluated according to the pseudo‐ second‐order reaction kinetic. Sorption isotherms were studied at temperatures 25.0∘C, 35.0∘C, and 45.0∘C. The Langmuir, Freundlich, and Dubinin‐Radushkevich (D‐R) sorption models equations were applied and the proper constants were derived. It was found that the sorption process is enthalpy driven for uranium(VI) and thorium(IV). Recovery of uranium(VI) and thorium(IV) ions after sorption was carried out by treatment of the loaded bentonite with different concentrations of HNO3 1.0 M, 0.5 M, 0.1 M, and 0.01 M. The best percent recovery for uranium(VI) and thorium(IV) was obtained when 1.0 M HNO3 was used.
Highlights
Jordan is rich in industrial rocks and minerals. e main two areas containing bentonite deposits in Jordan are Al Yamaniyya and Al Azraq areas
E adsorption of uranium and thorium on surfacemodi ed bentonite under hydrothermal conditions was studied using bentonite isolated from southern clay (USA). ey found changes in the speciation of uranium(VI) and thorium(IV) ions which have been observed in exchanged clays as a function of hydrothermal conditioning and/or surface modi cation. ere are indications of aggregation of both of these ions within the interlayer spacing of the clay [8]
Infrared spectra were recorded using a ermonicollet Nexus 870 Fourier Transform Infrared (FTIR). e thermal gravimetric analysis (TGA) was recorded using NETZSCH STA 409 PC. e main components and minor components present in bentonite were studied by X-ray powdered diffraction (Shimadzu PXRD6000). e XRF measurements were carried out by a sequential wavelength dispersive X-Ray Fluorescence spectrometer (Shimadzu XRF-1800)
Summary
Jordan is rich in industrial rocks and minerals. e main two areas containing bentonite deposits in Jordan are Al Yamaniyya and Al Azraq areas. Wyoming montmorillonite,
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