Uranium removal from aqueous solutions using a raw and HDTMA-modified phillipsite-bearing tuff

Bampaiti, A.; Μisaelides, P.; Noli, F.

doi:10.1007/s10967-014-3796-4

Cited by 5 publications

(5 citation statements)

References 36 publications

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“…At pH > 8, the continuing deprotonation of adsorbents might increases the negative charge and thus suppressed the adsorption of negative species of uranium(VI) on HTnF-SO 3 H and HTnF-COOH. Also, negatively charged uranium(VI) species are mainly larger and might have difficulty entering into this framework, as a result, the adsorption efficiencies of two adsorbents decreased. , At low concentration, it was observed that the adsorption decreased with increasing pH but had no effect on high concentrations . However, in this study, the effect of initial concentration at pH after equilibrium (pH eq ) was as follows: at pH 8 for low concentrations, the addition of these adsorbents decreased pH to 7.5 as shown in Figure b, where most of the uranium(VI) species were available, hence the adsorption was increased.…”

Section: Resultsmentioning

confidence: 64%

Modified Tubular Carbon Nanofibers for Adsorption of Uranium(VI) from Water

Ahmad

Yang

et al. 2020

ACS Appl. Nano Mater.

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Carbon nanomaterials with a hollow tubular nanofiber structure is of great interest for uranium(VI) adsorption from water. Their unique structure not only exposes a good number of functional groups and high surface area but also shows quick ion transport capacity. However, finding a simple method to prepare a new carbon structure is challenging. Herein, a new tubular hypercross-linked polymer is fabricated in a single pot using α,α′-dichloro-p-xylene (DCX) as a monomer. After carbonization, hollow tubular nanofibers (HTnFs) are obtained. Further, HTnFs are modified with carboxylic (COOH) and sulfonic(SO 3 H) groups to obtain HTnF-SO 3 H and HTnF-COOH designed for ultrafast and high uranium(VI) adsorption from water. From the batch studies, uranium(VI) adsorption efficiencies of two adsorbents are greater than 90 ± 0.5% under seawater conditions over a short period of 10 min. The accurate data fitting was performed by using different models and the adsorption results are in agreement with the Langmuir model. The adsorption results showing the maximum adsorption capacities of HTnF-COOH and HTnF-SO 3 H are 1928.59 and 1827.57 mg/g. The easy preparation, highest uranium(VI) adsorption, and regeneration properties suggest that these adsorbents act as good uranium(VI) adsorbents from large-scale water.

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Section: Resultsmentioning

confidence: 64%

Modified Tubular Carbon Nanofibers for Adsorption of Uranium(VI) from Water

Ahmad

Yang

et al. 2020

ACS Appl. Nano Mater.

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“…whereas with increasing pH neutral species (e.g. UO 2 (OH) 2 ) or precipitates (UO 3 Á2H 2 O) can be formed [32]. In the case of barium and europium precipitates were also observed at pH …”

Section: Effect Of Phmentioning

confidence: 96%

“…For each batch experiment 50 mg of the prepared MoO 3 were contacted with 10 mL of each solution in polycarbonate tubes and the mixture was agitated on a mechanical shaker for 24 h. The mixture was then centrifuged at 4000 rpm for 10 min to separate the sorbent from the supernatant and the equilibrium pH was measured. The residual concentration of the metal in the supernatant was finally determined by c-ray spectroscopy using a HPGe detector (CANBERRA, REGe detector, efficiency 20 %, energy resolution 2.1 keV for the 1332 keV 60 Co c-radiation) connected with a standard computerbased gamma-spectroscopy set-up (in the case of the Ba, Cs and Eu), atomic absorption spectrometry-AAS with a Perkin Elmer Spectrophotometer (model 300A) (in the case of Pb) and Arsenazo-III method with a Shimadzu UV160A Spectrophotometer (in the case of U) [30][31][32].…”

Section: Sorption Experimentsmentioning

confidence: 99%

Thermally modified molybdenum oxide as a potential sorbent for the removal of metal cations from aqueous solutions

Kapnisti

Noli

Arvanitidis

et al. 2015

J Radioanal Nucl Chem

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The effectiveness of a low cost sorbent produced by thermal modification of ammonium heptamolybdate (AHM) in adsorption of radionuclides and heavy metals was investigated. The product was characterized by XRD, SEM and Raman spectroscopy. Sorption experiments were performed in Pb, U, Cs, Ba and Eu solutions (pH 2.0-6.0). The obtained isotherms were simulated by Langmuir and Freundlich isotherms and kinetics data were used in order to evaluate the sorption mechanism. The results showed the high and selective efficiency of the AHM-derived MoO 3 especially in Pb and U removal whereas the desorption experiments revealed its environmental applicability under real conditions for the investigated metal cations.

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“…Possible phillipsite applications are presented below; these are due to the ion exchange capacity and the adsorption of various metals and compounds. Bampaiti et al (2015) have performed the process of removing uranium from aqueous solutions using phillipsite modified by HDTMA (hexadecyltrimethylammonium bromide). Zeolite used for the process came from the region of Naples, Italy.…”

Section: Phillipsitementioning

confidence: 99%