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Sorption of phosphates on Al-pillared smectites and mica at acidic to neutral pH
AbstractTo investigate sorption behaviors and mechanisms of phosphates, phosphate sorption (hereafter, P sorption) experiments were carried out for synthetic montmorillonite, beidellite, saponite, and fluor-tetrasilicic expandable mica pillared with cationic, Keggin ion-like, Al clusters (Alclst). The P sorption experiments were done in the final pH range of 3 to 7 at room temperature and at an initial concentration of 3.2 mmol/l P. The P sorption maxima for the Alclst samples were 0.66–0.87 mmol/g, which are higher by about 2 orders of magnitude than those for smectites without Alclst pillars. The sorption ability of the Alclst samples is nearly as high as that of Al-bearing minerals and materials such as boehmite and amorphous Al hydroxide, which are regarded as effective absorbents to remove P from water. Examinations by X-ray diffraction analysis, infrared spectroscopy, scanning electron microscopy, and analytical transmission electron microscopy indicated that the P sorption is mostly related to the OH functional groups of the Alclst pillars, but little to the P species in solution, the reactive sites on the edge surface of smectites and mica, or possible precipitates. The P sorption maxima increased with increasing an amount of Alclst pillars in the Alclst samples, suggesting that the P sorption maximum is determined by the number of the OH functional groups of the Alclst pillars and is independent of the structures and chemical compositions of the host phases.
Sorption of phosphates on Al-pillared smectites and mica at acidic to neutral pH
AbstractTo investigate sorption behaviors and mechanisms of phosphates, phosphate sorption (hereafter, P sorption) experiments were carried out for synthetic montmorillonite, beidellite, saponite, and fluor-tetrasilicic expandable mica pillared with cationic, Keggin ion-like, Al clusters (Alclst). The P sorption experiments were done in the final pH range of 3 to 7 at room temperature and at an initial concentration of 3.2 mmol/l P. The P sorption maxima for the Alclst samples were 0.66–0.87 mmol/g, which are higher by about 2 orders of magnitude than those for smectites without Alclst pillars. The sorption ability of the Alclst samples is nearly as high as that of Al-bearing minerals and materials such as boehmite and amorphous Al hydroxide, which are regarded as effective absorbents to remove P from water. Examinations by X-ray diffraction analysis, infrared spectroscopy, scanning electron microscopy, and analytical transmission electron microscopy indicated that the P sorption is mostly related to the OH functional groups of the Alclst pillars, but little to the P species in solution, the reactive sites on the edge surface of smectites and mica, or possible precipitates. The P sorption maxima increased with increasing an amount of Alclst pillars in the Alclst samples, suggesting that the P sorption maximum is determined by the number of the OH functional groups of the Alclst pillars and is independent of the structures and chemical compositions of the host phases.
Sorption of phosphates on Al-pillared smectites and mica at acidic to neutral pH
Kasama, Takeshi (author) / Watanabe, Yujiro (author) / Yamada, Hirohisa (author) / Murakami, Takashi (author)
Applied Clay Science ; 25 ; 167-177
2003-09-19
11 pages
Article (Journal)
Electronic Resource
English
Sorption of phosphates on Al-pillared smectites and mica at acidic to neutral pH
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