Enhancement of uranium extraction from seawater using chromic-acid-treated amidoxime adsorbent prepared by simultaneous irradiation grafting technique

Ratnitsai, Vareeporn; Wongsawaeng, Doonyapong; Chankow, Nares

doi:10.1080/00223131.2014.993737

Cited by 11 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To prepare the amidoxime adsorbent based on the chromic‐acid‐treated LDPE substrate, LDPE fibers were submerged in chromic acid at 70°C for 20 min 30 . Treated fibers were simultaneously gamma‐ray irradiated at 40 kGy with a 40:60 (v/v) AN:MAA monomer solution.…”

Section: Methodsmentioning

confidence: 99%

“…To prepare the amidoxime adsorbent based on the chromic-acid-treated LDPE substrate, LDPE fibers were submerged in chromic acid at 70 C for 20 min. 30 Treated fibers were simultaneously gamma-ray irradiated at 40 kGy with a 40:60 (v/v) AN:MAA monomer solution. Gamma irradiation from a 60 Co irradiator (Gammacell 220 Excel) with the dose rate of 6.21 kGy/h was performed at the Office of Atoms for Peace in Bangkok, Thailand.…”

Section: Chromic-acid-treated Ldpe Fibers Grafted With Amidoxime Grmentioning

confidence: 99%

See 1 more Smart Citation

Direct uranium recovery from brine concentrate using amidoxime adsorbents for possible future energy source

et al. 2020

Self Cite

View full text Add to dashboard Cite

Summary Recovery of uranium from concentrated brine rejection from a small seawater reverse osmosis plant in Thailand using four types of the amidoxime adsorbents was experimentally performed. Adsorbents were directly submerged in continuously flowing discharged brine concentrate. Studied adsorbents were amidoximated polymer gel prepared from gamma irradiation, amidoximated polymer gel prepared from UV radiation curing, amidoximated polyacrylonitrile fibers, and chromic‐acid‐treated low‐density polyethylene fibers grafted with amidoxime functional group using gamma radiation. Uranium concentration in brine concentrate and input seawater was analyzed to be 4.8 and 3.1 ppb, respectively. Gel adsorbent synthesized by gamma irradiation exhibited the highest uranium loading capacity of 1.39 mg/g‐ad with 20 000 L/h rejected brine flow‐rate after 6 weeks of soaking. The estimated uranium recovery cost is 406.81 USD/kg uranium. If the adsorption capacity was increased to 2 mg/g‐ad, the projected cost was reduced to 338.95 USD/kg. Under this land‐based recovery scheme, no work is performed in an open ocean environment, thus, ensuring safety and reducing cost and time, especially the costs associated with ships, personnel, and diesel fuel to bring the materials to the ocean and back to the shore. The present study demonstrates that direct uranium recovery from discharged brine concentrate is possible using amidoxime‐based adsorbents developed to study uranium extraction from natural seawater. This should pave the way for further experimental studies in larger seawater reverse osmosis (SWRO) plants for the possible future energy source. A proposed large‐scale, yet very simple, deployment strategy at a hypothetical SWRO plant is also presented. Novelty statement Successful uranium adsorption by directly submerging adsorbents in continuously flowing discharged brine concentrate from seawater reverse osmosis plant Mooring and recovery costs largely eliminated because of land‐based deployment Highest uranium uptake capacity of 1.39 mg/g adsorbent after 6 weeks of soaking

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Chromic-acid-treated Ldpe Fibers Grafted With Amidoxime Grmentioning

confidence: 99%

Direct uranium recovery from brine concentrate using amidoxime adsorbents for possible future energy source

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Seawater contains many elements with high concentrations such as Na, Cl, K, Ca, Mg, and so on. Uranium is present at a very low concentration and it's major form is uranyl tricabonate ion [ UO 2 (CO 3 ) 3 ] 4- [6]. Therefore, the method to recover uranium from seawater must exhibit have high selectivity and high efficiency toward uranyl ions.…”

Section: Periodmentioning

confidence: 99%

“…The fibers were subsequently washed with a methanol/water solution and soaked in 1 M hydrochloric acid solution. The fibers were washed with DI water for several times and was allowed to dry in a forced convection oven at 50 •C for 2 4 hours [6]. The preparation steps of the amidoxime fibers are shown in Figure 2.2.…”

Section: ) Amidoxime Polymersmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of high efficiency amidoxime polymer adsorbents for uranium extraction from seawater by radiation-induced polymerization

Wongjaikham

View full text Add to dashboard Cite

This study synthesized amidoxime polymer gel for uranium extraction from seawater through a polymerization process with gamma ray or UV-C radiation. The synthesis started with a mixture of acrylonitrile (AN) and methacrylic acid (MAA) monomers together with methylene bisacrylamide as a crosslinker and hydrogen peroxide in the case of UV radiation. The mixture was irradiated with gamma ray at various doses or UV-C for various durations. The resulting polymer gel was ground into fine particles and immersed in a hydroxylamine hydrochloride solution for 90 minutes in order to convert the chemical functional group from the cyano group into the amidoxime group. Results of laboratory-scale uranium extraction showed that for the case of amidoxime polymer gel prepared by gamma radiation, the ratio of monomer AN:MAA of 80:20, the amount of the crosslinker of 0.8 g/100 mL monomer, and 40 kGy gamma ray dose exhibited the highest uranium adsorption capacity. For the amidoxime polymer gel polymerized by UV-C radiation, the ratio of monomer AN:MAA of 80:20, the amount of the crosslinker of 1 g/100 mL monomer, hydrogen peroxide of 60 mL/100 mL monomer, and irradiation time of 8 hours exhibited the highest uranium adsorption capacity. The usage repeatability test indicated that after 8 cycles of repeated use, the polymer gel prepared from gamma ray did not show a decrease in the adsorption efficiency while the polymer gel prepared from UV-C showed a decrease in the adsorption efficiency of 50%. The field test results in natural seawater in front of Phuket Marine Biological Center (PMBC), Phuket province, Thailand for 8 weeks revealed that the polymer gel prepared from gamma ray exhibited the uranium adsorption of 0.05 mg/g while the polymer gel prepared from UV-C exhibited the uranium adsorption of 0.035 mg/g.

show abstract

Innovative seawater uranium recovery agent based on low-cost polyacrylonitrile fibers

Wongsawaeng

Wongjaikham

Swantomo

et al. 2020

Applied Radiation and Isotopes

View full text Add to dashboard Cite

Enhancement of uranium extraction from seawater using chromic-acid-treated amidoxime adsorbent prepared by simultaneous irradiation grafting technique

Cited by 11 publications

References 11 publications

Direct uranium recovery from brine concentrate using amidoxime adsorbents for possible future energy source

Direct uranium recovery from brine concentrate using amidoxime adsorbents for possible future energy source

Synthesis of high efficiency amidoxime polymer adsorbents for uranium extraction from seawater by radiation-induced polymerization

Innovative seawater uranium recovery agent based on low-cost polyacrylonitrile fibers

Contact Info

Product

Resources

About