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Vodolazov, L. I.; Shatalov, V. V.; Molchanova, T. V.; Peganov, V. A.

doi:10.1023/a:1011372311373

Cited by 9 publications

(2 citation statements)

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“…But our experiments showed that, even though the pH of the solution was 8.0, no precipitation was observed at the end of the adsorption process. At pH ) 4.0-5.0, uranyl is mainly in the state of UO 2 2+ and UO2OH 1+ , and little UO2(OH 2 0 ) exists (23). The UO2(OH 2 0 ) should be the precipitation of UO 2 2+ .…”

Section: Resultsmentioning

confidence: 98%

“…The decrease in adsorption at pH >7 may be due to the fact that the existing state of UO 2 2+ does not favor the adsorption process. As it is known that when the pH is higher than 6.0, UO 2 2+ in the solution will be precipitated after standing for a certain time and will change the existing state of UO 2 2+ in the solution (23). Therefore, it seems that the pH of the solution used for adsorption should be lower than 6.0.…”

Section: Resultsmentioning

confidence: 99%

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Collagen Fiber Immobilized Myrica rubra Tannin and Its Adsorption to

Liao

et al. 2003

Environ. Sci. Technol.

100

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Tannins, which are rich in ortho-hydroxyl groups, have a high affinity for UO2(2+). In this paper, Myrica rubra tannin was immobilized on collagen fiber by an aldehydic cross-linking reaction to prepare a novel adsorbent for uranium (UO2(2+)) recovery from wastewater. The adsorption equilibrium, the adsorption kinetics, and the effects of temperature and pH on the adsorption equilibrium were investigated in detail. It was found that the Myrica rubra tannin immobilized on collagen fiber exhibits an excellent adsorption capacity for UO2(2+). The adsorption capacity at 293 K and pH 5.0 was as high as 1.19 mmol UO2(2+)/g (283.3 mgU/g) when the initial concentration of UO2(2+) in solution was 7.5 mmol/L. The adsorption isotherms could be described by the Freundlich equation, and the increase of temperature promoted the adsorption to UO2(2+) . The adsorption kinetics data were fitted very well by the pseudosecond-order rate model, and the equilibrium adsorption capacity calculated by the pseudo-second-order rate model was almost the same as that determined by the actual measurement with the error < or = 4%. The pH has a significant effect on the adsorption process. According to our experiments, the suitable pH scope should be 5-8.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%