| 1. |
- Aneheim, Emma, 1982, et al.
(författare)
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Single Centrifugal Contactor Test of a Proposed Group Actinide Extraction Process for Partitioning and Transmutation Purposes
- 2015
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Ingår i: Separation Science and Technology. - : Informa UK Limited. - 1520-5754 .- 0149-6395. ; 50:10, s. 1554-1559
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Tidskriftsartikel (refereegranskat)abstract
- In this work a solvent comprising of tri-butyl phosphate and bis-triazinyl, bi-pyridine in cyclohexanone has been used in a single centrifugal contactor test to evaluate its GANEX process potential. It was found that the density of the aqueous phase had to be increased to facilitate phase separation in the centrifuge. The kinetics of the system was also found to be relatively slow in the equipment of choice, especially regarding the stripping. However, it was still possible to recover more than 87% of all actinides in one extraction step with minor fission product contaminations using a flowrate of 30 mL/h.
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| 2. |
- Aneheim, Emma, 1982, et al.
(författare)
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Studies of a Solvent for GANEX Applications Containing CyMe4-BTBP and DEHBA in Cyclohexanone
- 2012
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Ingår i: Separation Science and Technology. - : Informa UK Limited. - 1520-5754 .- 0149-6395. ; 47:5, s. 663-669
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Tidskriftsartikel (refereegranskat)abstract
- Research focus within separation for transmutation in Europe today lies in the development of a solvent extraction separation process called GANEX (Group ActiNide EXtraction). In this type of process the actinides should be extracted as a group and separated from the lanthanides and the other fission and corrosion/activation products. One GANEX process has been developed combining the two extractants bis-triazine-bi-pyridine (BTBP) and tri-butyl phosphate (TBP) in cyclohexanone. In previous work the TBP has been successfully substituted with N,N-di-2-ethylhexylbutyramide (DEHBA). In this paper, this exchange has been further studied investigating also fission product extraction as well as hydrolytic and radiolytic stability and acid extraction.
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| 3. |
- Aziz, F., et al.
(författare)
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Composite nanofibers of polyacrylonitrile/natural clay for decontamination of water containing Pb(II), Cu(II), Zn(II) and pesticides
- 2017
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Ingår i: Separation science and technology (Print). - : Taylor & Francis. - 0149-6395 .- 1520-5754. ; 52:1, s. 58-70
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Tidskriftsartikel (refereegranskat)abstract
- Composite nanofibers containing polyacrylonitrile and natural clay particles were fabricated and investigated for the removal of Pb(II), Cu(II) and Zn(II) from aqueous solutions. The adsorption behavior of Pb(II), Cu(II) and Zn(II) can be well described by the Langmuir adsorption model and high loading capacities at pH 7 were obtained. The kinetics of the adsorption process showed that equilibrium was attained after 60 min and the experimental data followed a pseudo-first-order model. The nanocomposites were also tested for photocatalytic degradation of Monocrotophos pesticides in which high degradation efficiency (>90%) was obtained in less than 60 min.
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| 4. |
- Belew, M., et al.
(författare)
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Purification of Recombinant Human Serum Albumin (rHSA) Produced by Genetically Modified Pichia Pastoris
- 2008
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Ingår i: Separation science and technology (Print). - : Informa UK Limited. - 0149-6395 .- 1520-5754. ; 43:11-12, s. 3134-3153
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Tidskriftsartikel (refereegranskat)abstract
- Recombinant human serum albumin (rHSA) was produced by genetically transformed Pichia pastoris yeast. The cell-culture supernatant (CCS) contained 8–12 g/l rHSA that was purified in a three-step procedureinvolving (1) a capture step using the newly developed cation exchanger CaptoTM MMC; (2) an intermediate step using Phenyl SepharoseTM and, (3) a polishingstep using Aminobutyl SepharoseTM 6 FF. The total recovery was 25–35% and the product fulfils the purity criteria of the European Pharmacopeia. Purified rHSA and plasma-derived HSA were essentially identical judging bySDS- or native-PAGE, and the pigment level (expressed as A 350/A280) in the rHSA was 0.03 or less and was strongly dependent on the quality of the CCS.Dimers and polymers in the final product were less than that found in purified plasma-derived HSA. The molar mass of the purified rHSA, as well as of its natural counterpart, is 67 000 Daltons by MALDI-ToF mass spectrometry, while the iso-electric points of both recombinant and natural HSA ranged between pH 5.42–5.55 when determined in 8M urea. The stability profiles of both proteins after heat treatment were identical as determined by differential scanning calorimetry (DSC). The results obtained here suggest the purified rHSA to be a homogeneous protein identical to its natural counterpart.
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| 5. |
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| 6. |
- Bhatnagar, Amit, et al.
(författare)
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Removal of anionic dyes from water using Citrus limonum (lemon) peel: Equilibrium studies and kinetic modeling
- 2009
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Ingår i: Separation science and technology (Print). - : Informa UK Limited. - 0149-6395 .- 1520-5754. ; 44, s. 316-334
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Tidskriftsartikel (refereegranskat)abstract
- The present study was undertaken to evaluate the adsorption potential of Citrus limonum (lemon) peel as an adsorbent for the removal of two anionic dyes, Methyl orange (MO) and Congo red (CR) from aqueous solutions. The adsorption was studied as a function of contact time, initial concentration, and temperature by batch method. The adsorption capacities of lemon peel adsorbent for dyes were found 50.3 and 34.5 mg/g for MO and CR, respectively. The equilibrium adsorption data was well described by the Langmuir model. Three simplified kinetic models viz. pseudo-first-order, pseudo-second-order, and Weber and Morris intraparticle diffusion model were tested to describe the adsorption process. Kinetic parameters, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were determined. It was found that the present system of dyes adsorption on lemon peel adsorbent could be described more favorably by the pseudo-first-order kinetic model. The results of the present study reveal that lemon peel adsorbent can be fruitfully utilized as an inexpensive adsorbent for dyes removal from effluents.
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| 7. |
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| 8. |
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| 9. |
- Bhatnagar, Amit, et al.
(författare)
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Removal of phenolic pollutants from water utilizing Mangifera indica (Mango) seed waste and cement fixation
- 2009
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Ingår i: Separation science and technology (Print). - : Informa UK Limited. - 0149-6395 .- 1520-5754. ; 44:13, s. 3150-3169
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Tidskriftsartikel (refereegranskat)abstract
- A process for the removal of two chlorophenols (2-chlorophenol and 2,4-dichlorophenol) from water using surface modified mango seed waste by adsorption process followed by cement fixation of the phenols-laden adsorbent is investigated. The two main objectives of this study were to develop efficient adsorbent utilizing mango seed waste by physiochemical activation and to an environmentally-friendly disposal of phenols-laden adsorbent into cement by a fixation process. The results of the present study reveal that the modified mango seed adsorbent showed an efficient adsorption potential for chlorophenols removal from water. The maximum adsorption potential of modified mango seed adsorbent for 2-chlorophenol and 2,4-dichlorophenol was 40.6 and 72.3 mg g−1, respectively at 25°C. Adsorption kinetic data of chlorophenols adsorption on mango seed adsorbent could be described more favorably by a pseudo-second-order kinetic model. After the adsorption studies, the phenol-laden adsorbent was immobilized in cement for its ultimate disposal. Leachates from the fixed phenols-laden adsorbent exhibit phenols concentrations lower than the drinking water standards. Results from this study suggest the potential utility of agricultural wastes as one of the most promising activated carbon precursors for phenols removal from water and wastewater and the safe disposal of phenol-laden adsorbent into cement by fixation process.
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| 10. |
- Bhatnagar, Amit, et al.
(författare)
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Sorption studies of bromate removal from water by nano-Al2O3
- 2012
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Ingår i: Separation science and technology (Print). - : Informa UK Limited. - 0149-6395 .- 1520-5754. ; 47:1, s. 89-95
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Tidskriftsartikel (refereegranskat)abstract
- The feasibility of nano-Al2O3 for bromate removal from aqueous solution was assessed in the present study. Batch sorption experiments were performed to examine the influence of various experimental parameters such as contact time, initial bromate concentration, temperature, and pH on the sorption of bromate on nano-Al2O3. Kinetic data revealed that the uptake rate of bromate was rapid in the beginning and 50% adsorption was completed within 10 min and equilibrium was achieved within 120 min. Pseudo-second-order kinetic model was fitted well with the kinetics of the sorption process. The sorption potential of nano-Al2O3 for bromate removal was similar to 6.0mg g(-)1. The adsorption was found to be an endothermic process and data conform to the Langmuir model.
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