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Journal articles on the topic 'Uranium Absorption and adsorption'

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Author: Grafiati

Published: 4 June 2021

Last updated: 11 February 2022

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1

He, Dianxiong, Ni Tan, Xiaomei Luo, Xuechun Yang, Kang Ji, Jingwen Han, Can Chen, and Yaqing Liu. "Preparation, uranium (VI) absorption and reuseability of marine fungus mycelium modified by the bis-amidoxime-based groups." Radiochimica Acta 108, no. 1 (December 18, 2019): 37–49. http://dx.doi.org/10.1515/ract-2018-3063.

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Abstract Bis-amidoxime-based claw-like-functionalized marine fungus material (ZZF51-GPTS-DCDA-AM) was prepared for study to absorb the low concentration uranium (VI) from aqueous solution. A series of characterization methods such as SEM, TGA and FT-IR were applied for the functionalized materials before and after modification and adsorption. The experimental results suggested that the amidoxime groups were successfully grafted onto the surface of mycelium powder and provided the special binding sites for the absorption of uranium (VI). In the absorption research, uranium (VI) initial concentration, pH and equilibrium time were optimized as 40 mg L−1, 6.0, and 110 min by L43 orthogonal experiment, respectively, and the maximum absorption capacity of the prepared material was 370.85 mg g−1 under the optimum batch conditions. After five cycling process, the desorption rate and regeneration efficiency of the modified mycelium were found to be 80.29 % and 94.51 %, respectively, which indicated that the material had an adequately high reusability property as a cleanup tool. The well known Langmuir and Freundlich isotherm adsorption model fitting found that the modified materials had both monolayer and bilayer adsorption to uranium (VI) ions. Simultaneously, the pseudo-second-order model was better to illustrated the adsorption kinetics process. The enhanced adsorption capacity of uranium (VI) by the modified fungus materials over raw biomass was mainly owing to the strong chelation of amidoxime groups and uranium (VI) ions.

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2

Tian, Kun, Shuting Zhuang, Jinling Wu, and Jianlong Wang. "Metal organic framework (La-PDA) as an effective adsorbent for the removal of uranium(VI) from aqueous solution." Radiochimica Acta 108, no. 3 (March 26, 2020): 195–206. http://dx.doi.org/10.1515/ract-2019-3145.

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AbstractA two-dimensional lanthanum(III) porous coordination polymer was prepared, characterized and applied as an efficient adsorbent for the removal of uranium from aqueous solution. Lanthanum(III) was the metal center of MOFs, and the deprotonated anions of pyridine-2,6-dicarboxylic acid (H2PDA), PDA2− was the organic ligand, this MOF was name as La-PDA, which was synthesized by hydrothermal reaction method. Scanning electron microscope (SEM), Fourier transform infrared (FTIR), powder X-ray diffraction (PXRD) and thermal gravimetric (TG) analysis were used for characterization, and the results indicated that the La-PDA composites were successfully prepared. Compared with traditional adsorbents of uranium, La-PDA showed excellent adsorption properties. The adsorption capacity was 247.6 mg g−1 at 298 K and pH 4.0. The adsorption equilibrium achieved within 120 min, and the adsorption process was exothermic and spontaneous. The absorption mechanism of La-PDA was also explored, from the XPS spectra, the pyridine-like nitrogen atoms (C=N–C) and carboxyl oxygen atoms (–COO–) contributed to the adsorption of uranium. The results suggested that PDA2− was a potential ligand of uranium adsorption, La-PDA composites were effective adsorbents for the removal of uranium from aqueous solution.

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3

Shen, Jiang Nan, Jie Yu, Yue Xia Chu, Yong Zhou, and Wei Jun Chen. "Preparation and Uranium Sorption Performance of Amidoximated Polyacrylonitrile/Organobentonite Nano Composite." Advanced Materials Research 476-478 (February 2012): 2317–22. http://dx.doi.org/10.4028/www.scientific.net/amr.476-478.2317.

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Polyacrylonitrile/montmorillonite (PAN/MMT) nanocomposite with amidoxime functionality was prepared from acrylonitrile monomer(AN) and montmorillonite(MMT) through in-situ intercalation polymerization. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction patter (XRD) were employed to characterize the obtained Na-MMT、Organ-MMT、PAN/MMT、APAN/MMT. Effects of preparing conditions of APAN/MMT on adsorption of uranium were investigated. The FT-IR spectra show that the new absorption band at 1653 cm-1( ) appears and the absorption band at 2243 cm-1(-CN) disappears on the spectrum of APAN/MMT, it indicates that the AN and MMT are successfully polymerized by in-situ polymerization and the PAN/MMT is amidoxime functionalized. The APAN/MMT nanocomposite completely lose the X-ray diffraction. The adsorption results show that the obtained APAN-MMT gives uranium adsorption capacity of 3.06 mg.g-1 under following conditions: uranium ion concentration of 10 mg/L, AM mass concentration of 80.0%, initiator of 4.5%, polymerization temperature of 70 °C，polymerization time of 3 h, pH of 7 and amidoxime functionalized reaction time of 2 h.

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4

Li, Juan, Jin Wang, Wei Wang, and Xuetong Zhang. "Symbiotic Aerogel Fibers Made via In-Situ Gelation of Aramid Nanofibers with Polyamidoxime for Uranium Extraction." Molecules 24, no. 9 (May 11, 2019): 1821. http://dx.doi.org/10.3390/molecules24091821.

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The uranium reserve in seawater is enormous, but its concentration is extremely low and plenty of interfering ions exist; therefore, it is a great challenge to extract uranium from seawater with high efficiency and high selectivity. In this work, a symbiotic aerogel fiber (i.e., PAO@ANF) based on polyamidoxime (PAO) and aramid nanofiber (ANF) is designed and fabricated via in-situ gelation of ANF with PAO in dimethyl sulfoxide and subsequent freeze-drying of the corresponding fibrous gel precursor. The resulting flexible porous aerogel fiber possesses high specific surface area (up to 165 m2·g−1), excellent hydrophilicity and high tensile strength (up to 4.56 MPa) as determined by BET, contact angle, and stress-strain measurements. The batch adsorption experiments indicate that the PAO@ANF aerogel fibers possess a maximal adsorption capacity of uranium up to 262.5 mg·g−1, and the absorption process is better fitted by the pseudo-second-order kinetics model and Langmuir isotherm model, indicating an adsorption mechanism of the monolayer chemical adsorption. Moreover, the PAO@ANF aerogel fibers exhibit selective adsorption to uranium in the presence of coexisting ions, and they could well maintain good adsorption ability and integrated porous architecture after five cycles of adsorption–desorption process. It would be expected that the symbiotic aerogel fiber could be produced on a large scale and would find promising application in uranium ion extraction from seawater.

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5

Wei, Qing Peng, Shi You Li, Shui Bo Xie, Jian Biao Liao, and Yin Li. "The Research of Absorption on U(VI) by Nanometer α-Fe₂O₃ Microsphere." Advanced Materials Research 1010-1012 (August 2014): 817–20. http://dx.doi.org/10.4028/www.scientific.net/amr.1010-1012.817.

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Adsorption of uranium(VI) ions by Sodium alginate (SA) immobilized nano-α-Fe2O3 particles beads were investigated in the batch experiments.The influences of the nano-ferric oxide content in beads，cross-linking time, solution pH, initial U(VI) concentration, temperature and contact time on U(VI) sorption were studied. The results indicated that the adsorption capacities are strongly affected by the solution pH, the best adsorption rate can be thought of to be at pH 3. The adsorption was rather fast in the initial 1.5 h, and the equilibrium was established in 9 h with the sorption capacity 2.64 mg/g. The kinetic adsorption data was simulated better by a pseudo-second-order equation. The removal rate increased slowly with temperature ascending . The adsorption process conformed to the Langmuir and Freundlich isothermal adsorption models, and the data fitted the latter better.

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6

Troyer, Lyndsay D., James J. Stone, and Thomas Borch. "Effect of biogeochemical redox processes on the fate and transport of As and U at an abandoned uranium mine site: an X-ray absorption spectroscopy study." Environmental Chemistry 11, no. 1 (2014): 18. http://dx.doi.org/10.1071/en13129.

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Environmental context Uranium and arsenic, two elements of human health concern, are commonly found at sites of uranium mining, but little is known about processes influencing their environmental behaviour. Here we focus on understanding the chemical and physical processes controlling uranium and arsenic transport at an abandoned uranium mine. We find that the use of sedimentation ponds limits the mobility of uranium; however, pond conditions at our site resulted in arsenic mobilisation. Our findings will help optimise restoration strategies for mine tailings. Abstract Although As can occur in U ore at concentrations up to 10wt-%, the fate and transport of both U and As at U mine tailings have not been previously investigated at a watershed scale. The major objective of this study was to determine primary chemical and physical processes contributing to transport of both U and As to a down gradient watershed at an abandoned U mine site in South Dakota. Uranium is primarily transported by erosion at the site, based on decreasing concentrations in sediment with distance from the tailings. Sequential extractions and U X-ray absorption near-edge fine structure (XANES) fitting indicate that U is immobilised in a near-source sedimentation pond both by prevention of sediment transport and by reduction of UVI to UIV. In contrast to U, subsequent release of As to the watershed takes place from the pond partially due to reductive dissolution of Fe oxy(hydr)oxides. However, As is immobilised by adsorption to clays and Fe oxy(hydr)oxides in oxic zones and by formation of As–sulfide mineral phases in anoxic zones down gradient, indicated by sequential extractions and As XANES fitting. This study indicates that As should be considered during restoration of uranium mine sites in order to prevent transport.

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7

Wang, Zimeng, Sung-Woo Lee, Jeffrey G. Catalano, Juan S. Lezama-Pacheco, John R. Bargar, Bradley M. Tebo, and Daniel E. Giammar. "Adsorption of Uranium(VI) to Manganese Oxides: X-ray Absorption Spectroscopy and Surface Complexation Modeling." Environmental Science & Technology 47, no. 2 (December 20, 2012): 850–58. http://dx.doi.org/10.1021/es304454g.

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8

Van Veelen, A., O. Preedy, J. Qi, G. T. W. Law, K. Morris, J. F. W. Mosselmans, M. P. Ryan, N. D. M. Evans, and R. A. Wogelius. "Uranium and technetium interactions with wüstite [Fe1–xO] and portlandite [Ca(OH)2] surfaces under geological disposal facility conditions." Mineralogical Magazine 78, no. 5 (October 2014): 1097–113. http://dx.doi.org/10.1180/minmag.2014.078.5.02.

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AbstractIron oxides resulting from the corrosion of large quantities of steel that are planned to be installed throughout a deep geological disposal facility (GDF) are expected to be one of the key surfaces of interest for controlling radionuclide behaviour under disposal conditions. Over the lengthy timescales associated with a GDF, the system is expected to become anoxic so that reduced Fe(II) phases will dominate. Batch experiments have therefore been completed in order to investigate how a model reduced Fe-oxide surface (wüstite, Fe1–xO) alters as a function of exposure to aqueous solutions with compositions representative of conditions expected within a GDF. Additional experiments were performed to constrain the effect that highly alkaline solutions (up to pH 13) have on the adsorption behaviour of the uranyl (UO22+) ion onto the surfaces of both wüstite and portlandite [Ca(OH)2; representative of the expected cementitious phases]. Surface co-ordination chemistry and speciation were determined by ex situ X-ray absorption spectroscopy measurements (both X-ray absorption near-edge structure analysis (XANES) and extended X-ray absorption fine structure analysis (EXAFS)). Diffraction, elemental analysis and XANES showed that the bulk solid composition and Fe oxidation state remained relatively unaltered over the time frame of these experiments (120 h), although under alkaline conditions possible surface hydroxylation is observed, due presumably to the formation of surface hydroxyl complexes. The surface morphology, however, is altered significantly with a large degree of roughening and an observed decrease in the average particle size. Reduction of U(VI) to U(IV) occurs during adsorption in almost all cases and this is interpreted to indicate that wüstite may be an effective reductant of U during surface adsorption. This work also shows that increasing the carbonate concentration in reactant solutions dramatically decreases the adsorption coefficients for U on both wüstite and portlandite, consistent with U speciation and surface reactivity determined in other studies. Finally, the EXAFS results include new details about exactly how U bonds to this metal oxide surface.

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9

Liu, Shao You, and Qing Ge Feng. "Synthesis of Uranium Doped TiO₂ Nanomaterial and its Visible Light Degradation Property." Advanced Materials Research 148-149 (October 2010): 1208–11. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1208.

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Uranium doped TiO2 (U-TiO2) nanomaterials, determined by scanning electron micro- graphy (SEM), were successfully synthesized via a simple, effective and environmental benign solid state reaction route. The characterizations via XRD and XPS showed that the uranium has been entered into the framework of anatase TiO2. The DRUV-Vis revealed that the adsorption region of U-TiO2 nanomaterials shifts to the visible light region compared with the pure TiO2. Moreover, the U-TiO2 nanomaterials for photodegradation of quinoline showed a good photocatalytic properties under visible light irradiation. At 298K, within 60 min visible light irradiation, 54.9 % of the initial quinoline was degraded by the U-TiO2 (U/Ti=3:20) catalyst. The visible light degradation rate of the U-TiO2 nanomaterials is negative to the pH value of surface but positive to the visible light absorption range.

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10

Lack, Joseph G., Swades K. Chaudhuri, Shelly D. Kelly, Kenneth M. Kemner, Susan M. O'Connor, and John D. Coates. "Immobilization of Radionuclides and Heavy Metals through Anaerobic Bio-Oxidation of Fe(II)." Applied and Environmental Microbiology 68, no. 6 (June 2002): 2704–10. http://dx.doi.org/10.1128/aem.68.6.2704-2710.2002.

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ABSTRACT Adsorption of heavy metals and radionuclides (HMR) onto iron and manganese oxides has long been recognized as an important reaction for the immobilization of these compounds. However, in environments containing elevated concentrations of these HMR the adsorptive capacity of the iron and manganese oxides may well be exceeded, and the HMR can migrate as soluble compounds in aqueous systems. Here we demonstrate the potential of a bioremediative strategy for HMR stabilization in reducing environments based on the recently described anaerobic nitrate-dependent Fe(II) oxidation by Dechlorosoma species. Bio-oxidation of 10 mM Fe(II) and precipitation of Fe(III) oxides by these organisms resulted in rapid adsorption and removal of 55 μM uranium and 81 μM cobalt from solution. The adsorptive capacity of the biogenic Fe(III) oxides was lower than that of abiotically produced Fe(III) oxides (100 μM for both metals), which may have been a result of steric hindrance by the microbial cells on the iron oxide surfaces. The binding capacity of the biogenic oxides for different heavy metals was indirectly correlated to the atomic radius of the bound element. X-ray absorption spectroscopy indicated that the uranium was bound to the biogenically produced Fe(III) oxides as U(VI) and that the U(VI) formed bidentate and tridentate inner-sphere complexes with the Fe(III) oxide surfaces. Dechlorosoma suillum oxidation was specific for Fe(II), and the organism did not enzymatically oxidize U(IV) or Co(II). Small amounts (less than 2.5 μM) of Cr(III) were reoxidized by D. suillum; however, this appeared to be inversely dependent on the initial concentration of the Cr(III). The results of this study demonstrate the potential of this novel approach for stabilization and immobilization of HMR in the environment.

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11

van Veelen, A., R. Copping, G. T. W. Law, A. J. Smith, J. R. Bargar, J. Rogers, D. K. Shuh, and R. A. Wogelius. "Uranium uptake onto Magnox sludge minerals studied using EXAFS." Mineralogical Magazine 76, no. 8 (December 2012): 3095–104. http://dx.doi.org/10.1180/minmag.2012.076.8.24.

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AbstractAround the world large quantities of sludge wastes derived from nuclear energy production are currently kept in storage facilities. In the UK, the British government has marked sludge removal as a top priority as these facilities are nearing the end of their operational lifetimes. Therefore chemical understanding of uranium uptake in Mg-rich sludge is critical for successful remediation strategies. Previous studies have explored uranium uptake by the calcium carbonate minerals, calcite and aragonite, under conditions applicable to both natural and anthropogenically perturbed systems. However, studies of the uptake by Mg-rich minerals such as brucite [Mg(OH)2], nesquehonite [MgCO3·3H2O] and hydromagnesite [Mg5(CO3)4 (OH)2·4H2O], have not been previously conducted. Such experiments will improve our understanding of the mobility of uranium and other actinides in natural lithologies as well as provide key information applicable to nuclear waste repository strategies involving Mg-rich phases. Experiments with mineral powders were used to determine the partition coefficients (Kd) and coordination of UO22+ during adsorption and co-precipitation with brucite, nesquehonite and hydromagnesite. The Kd values for the selected Mg-rich minerals were comparable or greater than those published for calcium carbonates. Extended X-ray absorption fine structure analysis results showed that the structure of the uranyl-triscarbonato [UO2(CO3)3] species was maintained after surface attachment and that uptake of uranyl ions took place mainly via mineral surface reactions.

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12

Tokar, Eduard, Konstantin Maslov, Ivan Tananaev, and Andrei Egorin. "Recovery of Uranium by Se-Derivatives of Amidoximes and Composites Based on Them." Materials 14, no. 19 (September 23, 2021): 5511. http://dx.doi.org/10.3390/ma14195511.

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An Se-derivative of amidoxime was synthesized for the first time as a result of the reaction of oxidative polycondensation of N’-hydroxy-1,2,5-oxadiazole-3-carboximidamide with SeO2: its elementary units are linked to each other due to the formation of strong diselenide bridges. The element composition of the material was established, and the structure of the elementary unit was suggested. The sorption-selective properties were evaluated, and it was found that the adsorbent can be used for the selective recovery of U (VI) from liquid media with a pH of 6–9. The effect of some anions and cations on the efficiency of recovery of U (VI) was estimated. Composite materials were fabricated, in which silica gel with a content of 35, 50, and 65 wt.% was used as a matrix to be applied in sorption columns. The maximum values of adsorption of U (VI) calculated using the Langmuir equation were 620–760 mg g−1 and 370 mg g−1 for the composite and non-composite adsorbents, respectively. The increase in the kinetic parameters of adsorption in comparison with those of the non-porous material was revealed, along with the increase in the specific surface area of the composite adsorbents. In particular, the maximum sorption capacity and the rate of absorption of uranium from the solution increased two-fold.

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13

Yin, Meiling, Jing Sun, Hongping He, Juan Liu, Qiaohui Zhong, Qingyi Zeng, Xianfeng Huang, Jin Wang, Yingjuan Wu, and Diyun Chen. "Uranium re-adsorption on uranium mill tailings and environmental implications." Journal of Hazardous Materials 416 (August 2021): 126153. http://dx.doi.org/10.1016/j.jhazmat.2021.126153.

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14

Estes, Shanna L., and Brian A. Powell. "Enthalpy of Uranium Adsorption onto Hematite." Environmental Science & Technology 54, no. 23 (November 9, 2020): 15004–12. http://dx.doi.org/10.1021/acs.est.0c04429.

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15

Scharer, J. M., and J. J. Byerley. "Aspects of uranium adsorption by microorganisms." Hydrometallurgy 21, no. 3 (May 1989): 319–29. http://dx.doi.org/10.1016/0304-386x(89)90005-4.

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16

Koske, P. H., K. Ohlrogge, and K. V. Peinemann. "Uranium Recovery from Seawates by Adsorption." Separation Science and Technology 23, no. 12-13 (October 1988): 1929–40. http://dx.doi.org/10.1080/01496398808075673.

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17

Yu, Shujuan, Jian Ma, Yanmin Shi, Zuoyong Du, Yuting Zhao, Xianguo Tuo, and Yangchun Leng. "Uranium(VI) adsorption on montmorillonite colloid." Journal of Radioanalytical and Nuclear Chemistry 324, no. 2 (March 5, 2020): 541–49. http://dx.doi.org/10.1007/s10967-020-07083-y.

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18

Asada, K., K. Ono, K. Yamaguchi, T. Yamamoto, A. Maekawa, S. Oe, and M. Yamawaki. "Hydrogen absorption properties of uranium alloys." Journal of Alloys and Compounds 231, no. 1-2 (December 1995): 780–84. http://dx.doi.org/10.1016/0925-8388(95)01717-8.

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19

Zamora, M. Limson, J. M. Zielinski, D. P. Meyerhof, and B. L. Tracy. "GASTROINTESTINAL ABSORPTION OF URANIUM IN HUMANS." Health Physics 83, no. 1 (July 2002): 35–45. http://dx.doi.org/10.1097/00004032-200207000-00004.

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20

Pan, Horng-Bin, Chien M. Wai, Li-Jung Kuo, Gary A. Gill, Joanna S. Wang, Ruma Joshi, and Christopher J. Janke. "A highly efficient uranium grabber derived from acrylic fiber for extracting uranium from seawater." Dalton Transactions 49, no. 9 (2020): 2803–10. http://dx.doi.org/10.1039/c9dt04562g.

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21

HIYOSHI, Katsunori, and Wataru MORIMITSU. "Adsorption of Uranium on Organo-clay Complex." RADIOISOTOPES 40, no. 10 (1991): 399–405. http://dx.doi.org/10.3769/radioisotopes.40.10_399.

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22

NAKAJIMA, Akira, and Takashi SAKAGUCHI. "Adsorption of uranium by vegetable crude drugs." Agricultural and Biological Chemistry 53, no. 11 (1989): 2853–59. http://dx.doi.org/10.1271/bbb1961.53.2853.

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23

Zhang, Zhibin, Haoyan Zhang, Yanfang Qiu, Haijun Chen, Ying Dai, Yunhai Liu, and Xiaohong Cao. "Adsorption of uranium by phosphorylated graphene oxide." SCIENTIA SINICA Chimica 49, no. 1 (December 24, 2018): 195–206. http://dx.doi.org/10.1360/n032018-00153.

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24

Nakajima, Akira, and Takashi Sakaguchi. "Adsorption of Uranium by Vegetable Crude Drugs." Agricultural and Biological Chemistry 53, no. 11 (November 1989): 2853–59. http://dx.doi.org/10.1080/00021369.1989.10869765.

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25

Abdi, S., M. Nasiri, A. Mesbahi, and M. H. Khani. "Investigation of uranium (VI) adsorption by polypyrrole." Journal of Hazardous Materials 332 (June 2017): 132–39. http://dx.doi.org/10.1016/j.jhazmat.2017.01.013.

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26

Xue, Guo, Feng Yurun, Ma Li, Gao Dezhi, Jing Jie, Yu Jincheng, Sun Haibin, Gong Hongyu, and Zhang Yujun. "Phosphoryl functionalized mesoporous silica for uranium adsorption." Applied Surface Science 402 (April 2017): 53–60. http://dx.doi.org/10.1016/j.apsusc.2017.01.050.

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27

Christou, Christos, Katerina Philippou, Theodora Krasia-Christoforou, and Ioannis Pashalidis. "Uranium adsorption by polyvinylpyrrolidone/chitosan blended nanofibers." Carbohydrate Polymers 219 (September 2019): 298–305. http://dx.doi.org/10.1016/j.carbpol.2019.05.041.

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28

Negm, Sameh H., Abd Allh M. Abd El-Hamid, Mohamed A. Gado, and Hassan S. El-Gendy. "Selective uranium adsorption using modified acrylamide resins." Journal of Radioanalytical and Nuclear Chemistry 319, no. 1 (December 4, 2018): 327–37. http://dx.doi.org/10.1007/s10967-018-6356-5.

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29

Tsuruta, Takehiko. "Adsorption of uranium from acidic solution by microbes and effect of thorium on uranium adsorption by Streptomyces levoris." Journal of Bioscience and Bioengineering 97, no. 4 (January 2004): 275–77. http://dx.doi.org/10.1016/s1389-1723(04)70203-0.

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30

Wu, Wanying, Diyun Chen, Jinwen Li, Minhua Su, and Nan Chen. "Enhanced adsorption of uranium by modified red muds: adsorption behavior study." Environmental Science and Pollution Research 25, no. 18 (April 24, 2018): 18096–108. http://dx.doi.org/10.1007/s11356-018-2027-x.

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31

Li, Shi You, Shui Bo Xie, Cong Zhao, Jin Xiang Liu, Hui Ling, and Zhong Hua Gu. "Study on Adsorption of Uranium in Wastewater by Clay." Applied Mechanics and Materials 209-211 (October 2012): 2081–85. http://dx.doi.org/10.4028/www.scientific.net/amm.209-211.2081.

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The effectives of pH value, contact time，sorbent dose and different initial concentration were analyzed to study the properties of the adsorption of uranium in wastewater by clay. The results show the highest adsorption capacity was obtained around neutral pH.The amount adsorbed of uranium on clay increase rapidly with increasing initial uranium concentration, but the removal rates of uranium are declined.Clay has a good adsorption capability to uranium with 18.25mg/g of adsorption capacity. The adsorption data on clay are followed by both Langmuir and Freundlich models and the results are well described by Langmuir isotherm. The pseudo-second-order kinetic model is more appropriate for the sorption process.

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32

Xiao-teng, Zhang, Jiang Dong-mei, Xiao Yi-qun, Chen Jun-chang, Hao Shuai, and Xia Liang-shu. "Adsorption of Uranium(VI) from Aqueous Solution by Modified Rice Stem." Journal of Chemistry 2019 (April 23, 2019): 1–10. http://dx.doi.org/10.1155/2019/6409504.

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The biosorption is an effective and economical method to deal with the wastewater with low concentrations of uranium. In this study, we present a systematic investigation of the adsorption properties, such as the kinetics, thermodynamics, and mechanisms, of modified rice stems. The rice stems treated with 0.5 mol/L NaOH solutions show higher removal percentage of uranium than those unmodified under the conditions of initial pH (pH = 4.0), absorbent dosage (5–8 g/L), temperature (T = 298 K), and adsorption equilibrium time (t = 180 min). The removal percentage of uranium(VI) decreases with increasing initial concentration of uranium(VI). The Langmuir isotherm model, which suggests predominant monolayered sorption, is better than Freundlich and Temkin models to elucidate the adsorption isotherm of adsorbed uranium. Kinetic analyses indicate that the uranium(VI) adsorption of the modified rice stem is mainly controlled by surface adsorption. The pseudo-second-order kinetic model, with the correlation coefficient of R2 = 0.9992, fits the adsorption process much better than other kinetic models (e.g., pseudo-second-order kinetic model, Elovich kinetic model, and intraparticle diffusion model). The thermodynamic parameters ΔG0, ΔH0, and ΔS0 demonstrate that the adsorption of uranium(VI) is an endothermic and spontaneous process, which can be promoted by temperature. The adsorption of uranium can change the morphology and the structure characteristics of the modified rice stem through interaction with the adsorption sites, such as O-H, C=O, Si=O, and P-O on the surface.

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33

Botez, Adriana, Tanase Dobre, Eugenia Panturu, and Antoaneta Filcenco-Olteanu. "Uranium (VI) adsorption equilibrium on purolite resin SGA 600 U/3472." Open Chemistry 12, no. 7 (July 1, 2014): 769–73. http://dx.doi.org/10.2478/s11532-014-0506-6.

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AbstractThis paper characterizes uranium (VI) sorption from synthetic solutions using a fixed bed Purolite resin SGA 600 U/3472 system. The effect of the sulphate anion presence in the liquid phase on sorbtion dynamics and equilibrium is analysed. In the industrial processing of solutions obtained from leaching of uranium ore (alkaline/acid), in a continuous system, there are several compounds which strongly compete with uranium for ion exchange sites and consequently these substances depress the uranium adsorption. The influence of vanadate, molybdate, chloride, and nitrate is known, therefore, in this paper, the adsorption equilibrium isotherms for uranium (VI) are obtained for different sulphate ion concentrations in solution. The adsorption capacity variation of the Purolite resin SGA 600U/3472 with the number of adsorption/desorption cycles is also studied. The experimental results reveal the negative impact of high sulphate ion content in solution on the adsorption capacity of the resin Purolite SG 600 U / 3472 with uranium (VI) and therefore it is considered one of the compounds which strongly affect the uranium adsorption.

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34

Liao, Qian, Chun Long Cui, and Jun Yi. "Study on Biosorption of Uranium by Bacillus subtilis and Saccharomyces uvarum." Advanced Materials Research 807-809 (September 2013): 1155–59. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.1155.

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The paper studied the growth law of Bacillus subtilis and Saccharomyces uvarum, and the interaction between the uranium system and strains in the different concentrations of uranium. The results showed that the B. subtilis almost appeared linear growth when uranium concentration was under the 450 mg/L, and the growth curve of the S.uvarum primarily met the S-growth curve model while uranium concentration was under the 600 mg/L. When the uranium concentration reaching 600 mg/L, the B. subtilis stopped growing, but the S. uvarum grown normally and had no significant difference compared with the control. The adsorption capacity of two strains increased with increasing uranium concentration under the 600 mg/L. While uranium concentration was 450 mg/L, the adsorption rate of two strains reached the maximum value (88.50%). The maximum adsorption capacity of B. subtilis and S. uvarum were 382.86 mgU/g and 113.04 mgU/g, respectively. In the real application, firstly, S. uvarum could be used to decrease the high concentration of uranium, and then B. subtilis was taken for further adsorption to achieve optimal effect of adsorption.

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35

Youssef, W. M., M. S. Hagag, and A. H. Ali. "Synthesis, characterization and application of composite derived from rice husk ash with aluminium oxide for sorption of uranium." Adsorption Science & Technology 36, no. 5-6 (April 16, 2018): 1274–93. http://dx.doi.org/10.1177/0263617418768920.

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A composite of rice husk (RH), caustic soda and aluminium oxide was synthesized at 500°C. The activated carbon and amorphous silica dispersed over the aluminium oxide selectively adsorbed uranium in the presence of other elements. At equilibrium time 1 h, phase ratio S/L (0.1 g/10 ml), pH = 5 and uranium initial concentration 120.6 mg/l uranium adsorption efficiency was 96.35%. The uranium stripping efficiency from the load RHA–alumina composite fulfilled 99.9% at 1 h equilibrium time, a phase ratio (S/A) of 0.05 g/10 ml and 0.5 mol/l HNO3. The scanning electron microscopy photos revealed that the rice husk ash (RHA)–alumina composite has vacant or regular cavities before the adsorption, and the cavities are fully occupied by uranium after adsorption. The Fourier transform infrared spectroscopy shows a more broadening of the band υ = 3526 and 3462 cm−1 which was ascribed to the uranium adsorption. The composite adsorbed 93.75% of uranium from a waste sample. The uranium adsorption exhibited a Langmuir isotherm.

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Zhang, Lei, Xiaoyan Jing, Rumin Li, Qi Liu, Jingyuan Liu, Hongsen Zhang, Songxia Hu, and Jun Wang. "Magnesium carbonate basic coating on cotton cloth as a novel adsorbent for the removal of uranium." RSC Advances 5, no. 30 (2015): 23144–51. http://dx.doi.org/10.1039/c4ra16446f.

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A magnesium carbonate basic coating on a cotton cloth was prepared by a facile and cost-effective method for uranium(vi) adsorption. The maximum adsorption capacity toward uranium is 370 mg g⁻¹, promoting a promising and effective adsorbent for practical uranium(vi) adsorption.

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Xu, Meixue, Kaifa Liao, Mouwu Liu, Yi Tan, and Yanfei Wang. "Study on cyclic crosslinked polyphosphazene microspheres and its adsorption behavior for uranium (VI)." E3S Web of Conferences 290 (2021): 03021. http://dx.doi.org/10.1051/e3sconf/202129003021.

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Poly (cyclotriphosphazene-co-4,4 '- diaminodiphenylsulfone) (PZD) microspheres were synthesi zed by precipitation polymerization of Hexachlorocyclotriphosphazene (HCCP) and polyfunctional organic monomers. The products were characterized by FTIR, SEM-EDS, XPS and bet. The adsorption behavior of PZD microspheres for uranium (VI) in aqueous solution and the influence of adsorption behavior were disc ussed. The results show that the PZD microspheres have a certain adsorption capacity for uranium (VI) in a queous solution. When pH = 3.5, adsorption time is 6h, solid-liquid ratio is 2.0g • L-1 and initial concentration of uranium (VI) is 30mg • L-1, the adsorption rate of uranium reaches the maximum.

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38

Karbowiak, M., and J. Drożdżyński. "Absorption spectrum analysis of uranium(III) formate." Journal of Alloys and Compounds 300-301 (April 2000): 329–33. http://dx.doi.org/10.1016/s0925-8388(99)00733-1.

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Konietzka, Rainer. "Gastrointestinal absorption of uranium compounds – A review." Regulatory Toxicology and Pharmacology 71, no. 1 (February 2015): 125–33. http://dx.doi.org/10.1016/j.yrtph.2014.08.012.

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Karbowiak, M., J. Drożdżyński, and Z. Gajek. "Absorption spectrum analysis of uranium trichloride heptahydrate." Journal of Alloys and Compounds 323-324 (July 2001): 678–82. http://dx.doi.org/10.1016/s0925-8388(01)01087-8.

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41

Leggett, R. W., and J. D. Harrison. "Fractional Absorption of Ingested Uranium in Humans." Health Physics 68, no. 4 (April 1995): 484–98. http://dx.doi.org/10.1097/00004032-199504000-00005.

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42

Li, Shi You, Shui Bo Xie, Cong Zhao, Ya Ping Zhang, Jin Xiang Liu, and Ting Cai. "Efficiency of Adsorption of Wastewater Containing Uranium by Fly Ash." Advanced Materials Research 639-640 (January 2013): 1295–99. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.1295.

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The effects of pH, different initial concentrations of uranium and adsorption time were investigated to study the properties of the sorption of uranium by fly ash. The results show that pH value is the major factor of dominating adsorption rate. The highest adsorption capacity was obtained at pH 5 and the adsorption time was 60 minutes. The increasing of initial uranium concentration resulted in the decreasing of U removal rate and the increasing of adsorption quantity, and the maximum adsorption capacity was 8.38mg/g. The adsorption behavior accorded with both the Freundlich and Langmuir isotherms.

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43

Zhang, Yangyang, Yilian Li, Yu Ning, Danqing Liu, Peng Tang, Zhe Yang, Yu Lu, and Xianbo Wang. "Adsorption and desorption of uranium(VI) onto humic acids derived from uranium-enriched lignites." Water Science and Technology 77, no. 4 (December 1, 2017): 920–30. http://dx.doi.org/10.2166/wst.2017.608.

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Abstract Humic acids (HAs) were extracted and characterized from three kinds of uranium-enriched lignites from Yunnan province, China. Batch experiments were used to study the adsorption and desorption behavior of uranium (VI) onto these HAs and a commercial HA. The results showed that the optimum pH level at which all the HAs adsorbed uranium(VI) ranged from 5 to 8. The high uranium content of the HAs was released into the solution at the pH values between 1 and 3; when the HA dosage was 2.5 g L−1, the maximum concentration of uranium was 44.14 μg L−1. This shows that HAs derived from uranium-enriched lignites may present a potential environmental risk when used in acidic conditions. The experimental data were found to comply with the pseudo-second-order kinetic model, and the adsorption isotherms fit the Langmuir and Freundlich models well. The desorption experiments revealed that the sorption mechanism was controlled by the complex interactions between the organic ligands of the HAs and uranium(VI). The uranium present in the HAs may not affect the adsorption capacity of the uranium(VI), but the carboxylic and phenolic hydroxyl groups in the HAs play a significant role in controlling the adsorption capacity.

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Kitahara, Keisuke, Chiya Numako, Yasuko Terada, Kiyohumi Nitta, Yoshiya Shimada, and Shino Homma-Takeda. "Uranium XAFS analysis of kidney from rats exposed to uranium." Journal of Synchrotron Radiation 24, no. 2 (February 20, 2017): 456–62. http://dx.doi.org/10.1107/s1600577517001850.

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The kidney is the critical target of uranium exposure because uranium accumulates in the proximal tubules and causes tubular damage, but the chemical nature of uranium in kidney, such as its chemical status in the toxic target site, is poorly understood. Micro-X-ray absorption fine-structure (µXAFS) analysis was used to examine renal thin sections of rats exposed to uranyl acetate. The ULIII-edge X-ray absorption near-edge structure spectra of bulk renal specimens obtained at various toxicological phases were similar to that of uranyl acetate: their edge position did not shift compared with that of uranyl acetate (17.175 keV) although the peak widths for some kidney specimens were slightly narrowed. µXAFS measurements of spots of concentrated uranium in the micro-regions of the proximal tubules showed that the edge jump slightly shifted to lower energy. The results suggest that most uranium accumulated in kidney was uranium (VI) but a portion might have been biotransformed in rats exposed to uranyl acetate.

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Liu, Jun, Changsong Zhao, Guoyuan Yuan, Feize Li, Jijun Yang, Jiali Liao, Yuanyou Yang, and Ning Liu. "Adsorption behavior of U(VI) on doped polyaniline: the effects of carbonate and its complexes." Radiochimica Acta 106, no. 6 (June 27, 2018): 437–52. http://dx.doi.org/10.1515/ract-2017-2865.

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Abstract In carbonate-buffer seawater or salt lake brines, three main uranium complexes, U(VI)-CO3 and Ca/Mg-U(VI)-CO3 complexes had been highlighted so far. In this paper, the effects of carbonate and its complexes on U(VI) adsorption onto doped polyaniline (PANI) were investigated using batch adsorption experiments. The adsorption equilibrium of U(VI) on doped PANI was reached within 30 min of contact time when U(VI)-CO3 complexes dominated the aqueous chemistry. Pseudo-second order and Langmuir isotherm models indicated that adsorption occurred on the homogeneous surface via monolayer chemisorption. Moreover, the increase in pHinitial, dissolved carbonate, calcium and magnesium concentrations could suppress the uranium adsorption process. The adsorption mechanisms under the weakly basic conditions were primarily involved in uranium anion species adsorption on nitrogen-containing functional groups instead of the anion exchange reactive sites on the doped PANI surface sites, whereas the U(VI)-CO3 complexes had a greater affinity than the Ca/Mg-U(VI)-CO3 complexes. The findings of this study are significant for the extraction of uranium resources from salt lake brines or seawater and for the prediction of uranium adsorption behaviors in weakly basic solution environments.

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46

Matijasevic, Srdjan, Aleksandra Dakovic, Magdalena Tomasevic-Canovic, Mirjana Stojanovic, and Deana Iles. "Uranium(VI) adsorption on surfactant modified heulandite/clinoptilolite rich tuff." Journal of the Serbian Chemical Society 71, no. 12 (2006): 1323–31. http://dx.doi.org/10.2298/jsc0612323m.

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The adsorption of uranium(VI) on heulandite/clinoptilolite rich zeolitic tuff modified with different amounts (2, 5 and 10 meq/100 g) of hexadecyltrimethyl ammonium (HDTMA) ion was investigated. The organozeolites were prepared by ion exchange of inorganic cations at the zeolite surface with HDTMA ions, and the three prepared samples were denoted as OA-2, OA-5 and OA-10. The maximal amount of HDTMAin the organozeolite OA-10 (10 meq/100 g) was equal to the external cation exchange capacity of the starting material. The results showed that uranium( VI) adsorption on unmodified zeolitic tuff was low (0.34 mg uranium(VI)/g adsorbent), while for the organozeolites, the adsorption increased with increasing amount of HDTMA at the zeolitic surface. The highest adsorption indexes were achieved for the organozeolite OA-10, in which all the surface inorganic cations had been replaced with HDTMA. An investigation of the adsorption of uranium(VI) ions onto organozeolite OA-10 at different pH values (3, 6 and 8) showed that the adsorption index increased with increasing amount of adsorbent in the suspension. Since uranium(VI) speciation is highly dependent on pH, from the adsorption isotherms, it can be seen that uranium(VI) adsorption on organozeolite OA-10 at pH 6 and 8 is well described by a Langmuir type of isotherm, while at pH 3, it corresponds to a Type III isotherm. .

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47

Kern, Raymond. "Adsorption, absorption, versus crystal growth." Crystal Research and Technology 48, no. 10 (August 13, 2013): 727–82. http://dx.doi.org/10.1002/crat.201200704.

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Brennecka, Gregory A., Laura E. Wasylenki, John R. Bargar, Stefan Weyer, and Ariel D. Anbar. "Uranium Isotope Fractionation during Adsorption to Mn-Oxyhydroxides." Environmental Science & Technology 45, no. 4 (February 15, 2011): 1370–75. http://dx.doi.org/10.1021/es103061v.

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Tbal, Hamid, Joëlle Morcellet, Michèle Delporte, and Michel Morcellet. "Uranium Adsorption by Chelating Resins Containing Amino Groups." Journal of Macromolecular Science, Part A 29, no. 8 (August 1992): 699–710. http://dx.doi.org/10.1080/10601329208052194.

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50

Zou, L., Z. Chen, X. Zhang, P. Liu, and X. Li. "Phosphate promotes uranium (VI) adsorption inStaphylococcus aureusLZ-01." Letters in Applied Microbiology 59, no. 5 (August 20, 2014): 528–34. http://dx.doi.org/10.1111/lam.12310.

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