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- W4321442384 endingPage "106866" @default.
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- W4321442384 abstract "Niobium (Nb) in kaolin clay usually occurs in the Ti-bearing minerals, such as rutile and anatase. However, the low Ti-bearing minerals contents for some kaolin clay rocks were insufficient to explain the high Nb concentrations. Thus, Nb was widely considered to be adsorbed by clay minerals. However, the adsorption behavior of niobium (V) on clay minerals has not been fully understood. In this study, a series of batch adsorption experiments were carried out on kaolin clay (Kclay) and pure kaolinite (Kaol) using niobium oxalate solutions. The effects of contact time, initial niobium (V) concentration, solution pH, and temperature on the adsorption were investigated. The results showed that Kclay exhibited a higher adsorption capacity than Kaol under the same conditions. The niobium (V) adsorptions on Kclay and Kaol were pH-dependent, and both of them showed declining adsorption capacities from pH 2 to 4. The adsorption behaviors of niobium (V) on Kclay and Kaol conformed to the pseudo-second-order model. The adsorption isotherm of Kclay was a better fit with the Freundlich isotherm model, while the Langmuir isotherm model was a better fit for Kaol. The Langmuir maximum adsorption amount of Kclay and Kaol were 5.42 and 2.25 mg/g, respectively. These results demonstrated that niobium (V) can be adsorbed by kaolin clay and kaolinite." @default.
- W4321442384 created "2023-02-22" @default.
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- W4321442384 date "2023-04-01" @default.
- W4321442384 modified "2023-10-18" @default.
- W4321442384 title "The adsorption behavior of niobium (V) on kaolin clay and kaolinite" @default.
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- W4321442384 doi "https://doi.org/10.1016/j.clay.2023.106866" @default.
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