Recovery of uranium from sea water. IV. Influence of crosslinking reagent of the uranium adsorption of macroreticular chelating resin containing amidoxime groups

Poly[4-(4-vinylbenzyloxy)-2-hydroxylbenzaldehyde] was evaluated for removing low concentrations of lead(II) in ppb levels from aqueous media. The effects of the pH condition and the initial lead concentrations on removal were examined. It was found that the metal absorption is best described with the Langmuir model. The R L values obtained between 0.01 and 0.23 indicate that favorable absorption occurs in the studied concentration ranges. The kinetic study revealed that the metal removal proceeds at a very fast pace-less than 30 s-to reach the maximum capacity. The data fit the description of pseudo-second-order rate. The dynamic column study for real-time practical absorption also was investigated. V

Section: Effect Of Concentration On Rates Of Adsorptionmentioning

confidence: 94%

Poly[4‐(4‐vinylbenzyloxy)‐2‐hydroxylbenzaldehyde] for rapid removal of low concentrations of Pb(II)

Amoyaw

Ingram

Hsu³

et al. 2009

“…Marchese et al 26 have investigated separation of cobalt, nickel, and copper ions with alanine liquid membranes, and they reported that equilibrium was achieved in about 4 -5 h. Shreedhara-Murthy and Ryan 27 have investigated mercury, copper, cadmium, lead, and uranium adsorption on cellulose-dithio-carbamate resins and reported that the adsorption rates were very slow. Egawa 28 has studied uranium adsorption on polyacrylo-nitrile fibers containing amidoxime groups and reported a 7-h equilibrium adsorption time. Teramoto et al 29 reported that a spiral type sup- ported liquid membrane reached steady state at about 4 h. Roozemond et al 30 studied copper and cadmium uptake by 3,5-dimethyl-1-hydroxymethyl pyrazole attached p-amino-methyl substituted poly(styrene-co-divinylbenzene) chelating polymer.…”

Section: ؉ Adsorption Studiesmentioning

confidence: 99%

Adsorption of Ni²⁺ from aqueous solutions by novel polyethyleneimine‐attached poly(p‐chloromethylstyrene) beads

Say

Tuncel

Deni̇zli̇

2002

ABSTRACT:In this study Ni 2ϩ adsorption properties of polyethyleneimine (PEI)-attached poly(p-chloromethylstyrene) (PCMS) beads were investigated. Spherical beads with an average size of 186 m were obtained by the suspension polymerization of p-chloromethylstyrene conducted in an aqueous dispersion medium. Owing to the reasonably rough character of the bead surface, PCMS beads had a specific surface area of 14.1 m 2 /g. PEI chains could be covalently attached onto the PCMS beads with equilibrium binding capacities up to 208 mg PEI/g beads, via a direct chemical reaction between the amine and chloro-methyl groups. After PEI adsorption with 10% (w/w) initial PEI concentration, free amino content of PEI-attached PCMS beads was determined as 0.91 mEq/g. PEI-attached PCMS beads were utilized as adsorbents in the adsorption/desorption of Ni 2ϩ ions from synthetic solutions. The adsorption process was fast; 90% of adsorption occurred within 90 min, and equilibrium was reached at around 2 h. Adsorption capacity was obtained to be 78.2 mg/g at a pH of about 6.0. The chelating beads can be easily regenerated by 0.1 M HNO 3 with higher effectiveness.

“…6 The capacities for uncomplexed uranyl ion were evaluated by shaking 0.125 g of a resin with 50 mL of 0.01M uranyl nitrate solution. The adsorption of uranium from sea water was carried out at 30°C as follows: To a column (inner diameter 1 cm, length 30 cm) packed with 0.5 g of a resin, 20 L of natural sea water was upflow delivered at a flow rate of 900 mL/h using a peristaltic pump.…”

Section: Chemical Propertiesmentioning

confidence: 99%

Amidoxime resins based on poly(acrylonitrile‐co‐vinylidene chloride‐co‐divinylbenzene) and their behavior in uptake of uranium from sea water

Kabay

Hayashi

Jyo

et al. 1994

Self Cite

SYNOPSISAmidoxime resins were derived from poly ( acrylonitrile-co-vinylidene chloride-co-divinylbenzene ) beads, which were prepared by suspension polymerization of the ternary monomeric mixtures in the presence of 4-methyl-2-pentanone (MIBK) or 1,2-dichloroethane (DCE) as the diluent (porogen) , in order to clarify the effect of copolymerized vinylidene chloride on properties of the resulting amidoxime resins. Pore structure analyses of the copolymers as well as of their amidoximated derivatives clarified that MIBK yields larger pores than does DCE and then the latter gives larger specific surface areas than does the former. On the other hand, chemical properties of the amidoximated resins, such as anionexchange capacities and uranyl ion uptake, were not essentially affected by the diluent species, indicating that both MIBK and DCE as the porogen lead to the amidoxime resins with almost the same ability in recovery of uranium from sea water. The uranium recovery decreased with increase in the vinylidene chloride content, but the decrease in the recovery was minor up to the 10 mol % of vinylidene chloride. It was also clarified that the uranium recovery by the amidoxime resins containing vinylidene chloride is greatly enhanced by the alkali treatment.