Relevant bibliographies by topics / Phosphates – Absorption and adsorption

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Academic literature on the topic 'Phosphates – Absorption and adsorption'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Phosphates – Absorption and adsorption"

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Gray-Wannell, Nia, Peter J. Holliman, H. Christopher Greenwell, Evelyne Delbos, and Stephen Hillier. "Adsorption of phosphate by halloysite (7 Å) nanotubes (HNTs)." Clay Minerals 55, no. 2 (June 2020): 184–93. http://dx.doi.org/10.1180/clm.2020.24.

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AbstractThe adsorption and retention of phosphates in soil systems is of wide environmental importance, and understanding the surface chemistry of halloysite (a common soil clay mineral) is also of prime importance in many emerging technological applications of halloysite nanotubes (HNTs). The adsorption of phosphate anions on tubular halloysite (7 Å) has been studied to gain a greater understanding of the mechanism and kinetics of adsorption on the surface of HNTs. Two well-characterized tubular halloysites with differing morphologies have been studied: one polygonal prismatic and one cylindrical, where the cylindrical form has a greater surface area and shorter tube length. Greater phosphate adsorption of up to 42 μmol g–1 is observed on the cylindrical halloysite when compared to the polygonal prismatic sample, where adsorption reached a maximum of just 15 μmol g–1 compared to a value for platy kaolinite (KGa-2) of 8 μmol g–1. Phosphate adsorption shows strong pH dependence, and the differences in phosphate sorption between the prismatic and cylindrical morphologies suggest that phosphate absorption does not occur at the same pH-dependent alumina edge sites and that the lumen may have a greater influence on uptake for the cylindrical form.
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Shin, Euisup S., Ill Yong Kim, Sung Baek Cho, and Chikara Ohtsuki. "Inhibitory Effects of Doped Aluminum and Silicon on HAp-Forming Ability of Titania in Simulated Body Fluid." Key Engineering Materials 529-530 (November 2012): 641–45. http://dx.doi.org/10.4028/www.scientific.net/kem.529-530.641.

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Chemical modification of titanium substrate provides ability of hydroxyapatite (HAp) formation that is important property for bone-bonding capability after implantation in bony defects. Potential of the HAp-formation is occasionally reduced. In the present study, we investigated potential of the HAp-formation on titanium oxide (titania) with doped silicon or aluminum in simulated body fluid (SBF). Sol-gel processing was applied to prepare titania with doped silicon (TSx) or aluminum (TAx), in its nominal composition ranging from 0 to 10 mol%. Specific surface area of the prepared samples was gradually increased with increasing the amounts of silicon or aluminum. Zeta potential of TAx was definite changed from negative charge to positive charge with increasing aluminum amounts, but TSx slightly changed to be positive with increasing silicon amounts. The pure titania sample free from doping of silicon or aluminum showed formation of calcium phosphate precipitates, that is HAp-formation, after soaking in SBF for 14 d. In contrast, all the titania samples with doped silicon or aluminum hardly showed evidence of precipitates of calcium phosphates, although absorption of calcium and phosphate ions were detected. Especially, TAx showed remarkable adsorption of phosphate ions. Aluminum-doping in titania enhances the adsorption of phosphate ion on the surface, but reduce nucleation rate of calcium phosphates in body environment.
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Suzuki, M., A. Fujishima, T. Miyazaki, H. Hisamitsu, H. Ando, M. Nakahara, M. Yamamoto, and K. Itoh. "A study on adsorption structures of methacryloyloxyalkyl dihydrogen phosphates on silver substrates by infrared reflection absorption spectroscopy." Journal of Biomedical Materials Research 37, no. 2 (November 1997): 252–60. http://dx.doi.org/10.1002/(sici)1097-4636(199711)37:2<252::aid-jbm15>3.0.co;2-g.

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Larsson, Maja A., Ingmar Persson, Carin Sjöstedt, and Jon Petter Gustafsson. "Vanadate complexation to ferrihydrite: X-ray absorption spectroscopy and CD-MUSIC modelling." Environmental Chemistry 14, no. 3 (2017): 141. http://dx.doi.org/10.1071/en16174.

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Environmental contextVanadium, a metal pollutant from fossil fuels and slags, may be toxic, thereby necessitating an understanding of its environmental chemistry. One important factor that controls the mobility and bioavailability of vanadium is its binding to iron oxides. This study focuses on the characterization and modelling of vanadium adsorption onto ferrihydrite. The new model can be used to simulate the transport and bioavailability of vanadium in the environment. AbstractThe mobility of vanadium in the environment is influenced by sorption to metal (hydr)oxides, especially those containing iron. The aim of this study is to understand the adsorption behaviour of vanadium on poorly ordered (two-line) ferrihydrite (Fh). A further objective was to determine the binding mechanism of vanadate(V) to ferrihydrite surfaces in aqueous suspension to constrain the CD-MUSIC surface complexation model. Vanadium adsorption to ferrihydrite was evaluated by batch experiments which included series with different Fh-to-V ratios and pH values. Vanadate(V) adsorption was also evaluated in the presence of phosphate to compete with vanadate(V) for the available surface sites on ferrihydrite. In agreement with earlier studies, vanadate(V) was strongly adsorbed to ferrihydrite and the adsorption increased with decreasing pH. In the presence of phosphate, less vanadate(V) was adsorbed. Analysis by X-ray absorption near-edge structure spectroscopy revealed that the adsorbed vanadium was tetrahedral vanadate(V), VO4, regardless of whether vanadate(V) or vanadyl(IV) was added to the system. Spectra collected by extended X-ray absorption fine structure spectroscopy showed that vanadate(V) is bound primarily as an edge-sharing bidentate complex with V⋯Fe distances around 2.8Å. Based on this information, a surface complexation model was set up in which three bidentate vanadate(V) complexes with different degrees of protonation were included. The model provided a satisfactory description of vanadate(V) adsorption over most of the pH and concentration ranges studied, also in the presence of competing phosphate ions.
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Huang, Zhao Long, Shao Ping Feng, Yan Jiang, Rui Min Xiao, Li Da Sun, and Shun Li Lu. "Improvement on Determination of the Adsorption Value of Activated Carbon on Methylene Blue." Advanced Materials Research 1033-1034 (October 2014): 579–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.579.

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Characteristics of absorption of activated carbon on methylene blue were studied. It was demonstrated that adsorption of activated carbon on methylene blue was very stable on monomolecular adsorption and when multimolecular adsorption existed adsorption became to be weak. An improved method was suggested that many samples were tested adsorption of activated carbon on methylene blue in parallel experiment and certain sample was selected to use in next experiment, its color should approximate to the color of 0.4% CuSO4 but darker slightly and activated carbon loaded methylene blue was added some fresh phosphate buffer solution to desorb methylene blue on the activated carbon, testing absorption value total concentration of methylene blue in the solutionin (merging the first and second experiment) by spectrophotometer, calculating adsorption value on difference method which original volume of methylene blue added subtracts rest of methylene blue in the solution after adsorption. The new method was simple, rapid and easy. word times would shorten obviously.
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Wu, N., Jie Weng, Shu Xin Qu, Jian Xin Wang, Xiong Lu, and Bo Feng. "Hydroxyapatite Formation and Protein Absorption on Triethyl Phosphate Modified Titanium Surface." Advanced Materials Research 26-28 (October 2007): 797–800. http://dx.doi.org/10.4028/www.scientific.net/amr.26-28.797.

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In this work, triethyl phosphate (TEP) was used to bioactivating titanium. Titanium plates grafted with TEP were immersed in a two times concentrated simulated body fluid (2SBF) to investigate deposition of hydoxyapatite (HA) on the surface. A phosphate buffer solution (PBS) with bovine serum albumin (BSA) was used to evaluate adsorption of protein on the grafted titanium surface. The morphology, component and structure of samples were examined by scanning electronic microscopy, attenuated total reflection Fourier transform infrared spectroscopy and X-ray diffraction respectively. The concentration change of BSA in adsorption test was examined with the ultraviolet-visible absorption spectra (UV). The analyses showed that TEP grafted onto the titanium surface. In 2SBF, calcium and phosphate ions deposited spontaneously onto the grafted titanium surface and formed a HA coating with a network-like microporous structure after being immersed for 3 days. The coating consisted of HA particles with 180-265nm in thickness and 72-85nm in width. The diameter of the micropores was about 200nm. The HA coating appeared better uniformity than that on the modified titanium using phosphoric acid. BSA rapidly adsorbed onto the grafted titanium surface at first half an hour and then the adsorption quantity almost kept constant. These results indicate that TEP grafting is an effective approach to modify bioactivity of titanium.
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Liu, Jiu Xu, Feng Wang, Jian Xing Shen, Qi Hui Lai, and Ying Gai. "Study of Nano-Hydroxyapatite Adsorption in Heavy Metals." Advanced Materials Research 777 (September 2013): 15–18. http://dx.doi.org/10.4028/www.scientific.net/amr.777.15.

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nanohydroxyapatite (nanoHA) powders were prepared by liquid phase precipitation method, using diammonium hydrogen phosphate and calcium nitrate tetrahydrate as raw materials. It was studied that the prepared nanoHA powders not sintered and sintered at 800°C to adsorption of Cu2+ and Pb2+ in aqueous solutions, respectively. The structure and size of nanoHA powders was investigated by X-ray diffraction (XRD) and the concentrations of Cu2+and Pb2+ in aqueous solutions were tested by inductively coupled plasma emission spectrometer. The results revealed that the nanoHA powders have obvious absorption function for Cu2+ and Pb2+ in aqueous solutions. In addition, the absorption ratio was affected by the size of nanoHA.
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Fatimah, Sri Rahmadaniati Effendi Effendi, and Charissa Dini Sofith. "Pengaruh Ukuran Partikel Zeolit Alam yang Diaktivasi dan Diimpregnasi HCl dan Mg2+ pada Penjerapan Ion Fosfat." Jurnal Teknik Kimia USU 10, no. 1 (March 25, 2021): 13–18. http://dx.doi.org/10.32734/jtk.v10i1.4010.

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Research on phosphate adsorption using natural zeolites which were activated and impregnated with HCl and Mg2 +had been carried out. This study examined the effect of natural zeolite particle size on phosphate ion adsorption. Stages of the study began from sifting zeolites in accordance with the specified size (50/70 mesh, 70/110 mesh and 110/120 mesh), washing, activation and impregnation. Natural zeolite with 110/120 mesh particle size is used to determine the contact time in absorbing phosphate ions. Natural zeolite can absorb phosphate as much as 8.53 mg / l or 85.3% with a contact time of 35 minutes. The variation of the adsorption on the natural zeolite particle size is carried out to get the effect of the natural zeolite particle size on the adsorption of phosphate ions. Phosphate ions which are absorbed by zeolites are analyzed using a UV-Vis spectrophotometer. The highest absorption efficiency (99.26%) was obtained for natural zeolite particle size 110/120 mesh. The natural zeolite adsorption isotherm model of the phosphate ion is tested with the Freundlich and Langmuir equations. Based on the data obtained, the isotherm model suitable for this study is Freundlich with a value of R2 = 0.985.
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Tricot, Y., DN Furlong, AWH Mau, and WHF Sasse. "Dihexadecyl Phosphate Vesicles: Difference in the Spectroscopic Properties of Tris(2,2′-bipyridine)ruthenium(II) Adsorbed on the Inner and Outer Surfaces." Australian Journal of Chemistry 38, no. 4 (1985): 527. http://dx.doi.org/10.1071/ch9850527.

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The visible absorption spectrum of tris (2,2′-bipyridine)ruthenium(II) [ Ru ( bpy )32+] adsorbed on the outer surface of dihexadecyl phosphate vesicles is indistinguishable from the spectrum of free Ru ( bpy )32+ in aqueous solution. By contrast, the absorption spectrum of Ru ( bpy )32+ that is entrapped in vesicles by adsorption on inner surfaces exhibits a red shift in its visible absorption peak, and the extinction coefficient for this peak is increased. The emission spectrum for outer-adsorbed Ru ( bpy )32+ is red-shifted whilst that for inner-adsorbed Ru ( bpy )32+ is blue-shifted, compared with the spectrum for free Ru ( bpy )32+ in solution. The excited state of Ru ( bpy )32+ was longer lived, and was much less sensitive to quenching by oxygen, when the complex was adsorbed on inner vesicle walls. The above spectral variations indicate that the adsorption of Ru ( bpy )32+ on inner surfaces occurs in a way which leads to more spatial restriction on Ru ( bpy )32+ ions than does adsorption on outer surfaces of the bilayer . This asymmetry may be due to differences in the packing of dihexadecyl phosphate molecules as well as in the ionic strength of inner and outer aqueous environments.
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Nie, Zhaojun, Jinfeng Li, Haiyang Liu, Shiliang Liu, Daichang Wang, Peng Zhao, and Hongen Liu. "Adsorption kinetic characteristics of molybdenum in yellow-brown soil in response to pH and phosphate." Open Chemistry 18, no. 1 (June 18, 2020): 663–68. http://dx.doi.org/10.1515/chem-2020-0501.

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AbstractMolybdenum (Mo) adsorption by acidic yellow-brown soil was investigated as a function of a pH (1–13) and the equilibrium of P solution (0, 3.1, and 31 mg L−1) concentration. Mo adsorption by acidic yellow-brown soil increased within the pH range from 1 to 4. Above pH 4, Mo adsorption decreases with an increase in pH. The maximum adsorption was found between pH 2 and 4. Competitive adsorption experiments showed that the equilibrium sorption data fitted into Langmuir and Freundlich isotherms. The sorption data of Mo on the acidic yellow-brown soil fitted well with the Langmuir isotherm model due to the higher R2 value. A reduction in Mo adsorption by the acidic yellow-brown soil was noticed at higher addition levels of P (3.1 and 31 mg L−1). Therefore, P increasing the bioavailability of Mo and enhancing Mo uptake by plants might be related to the inhibition of Mo absorption by the acidic yellow-brown soil.
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Dissertations / Theses on the topic "Phosphates – Absorption and adsorption"

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Fu, Yong 1948. "Solid activity coefficients of phosphate adsorbed by soil." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276722.

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The data of 14 soils were used to compute the ion activity product (IAP), the ratio of the ion activity product and to the solubility product (Ksp) of the pure minerals (IAP/Ksp) and to estimate the solid activity coefficients (SAC) of the soil components. The value of IAP and SAC of AlPO4 differs from soil to soil and increases with increasing P added to soil in acid soils and for calcium phosphate in basic soils. Magnesium apparently did not cause P adsorption or precipitation in the soils studied. The SAC of aluminum phosphate ranged from 10 to 10000 in acid soils. The mole fraction of the total phosphate in soil seemed to be a more satisfactory basis for calculating the concentration of the solid phase than was measurements of the available phosphate.
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Paul, Kristian W. "Molecular modeling study of sulfate and phosphate adsorption at the mineral-water interface." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 223 p, 2009. http://proquest.umi.com/pqdweb?did=1654487581&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Sandhu, Harjinder. "Sorption of lead and arsenic on soil components and effectiveness of phosphates for remediating lead and arsenic contaminated soils." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=1923.

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Thesis (Ph. D.)--West Virginia University, 2001.
Title from document title page. Document formatted into pages; contains xii, 170 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
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Saad, Rabih. "Adsorption et désorption d'ions phosphate et nitrate par des matériaux mésoporeux à base de silice fonctionnalisés avec des groupements ammonium." Thesis, Université Laval, 2008. http://www.theses.ulaval.ca/2008/25747/25747.pdf.

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Kurtz, Frederick C. "The mobility of malathion in a silt loam soil as affected by phosphate and naturally occuring organic acids." Thesis, Virginia Tech, 1992. http://hdl.handle.net/10919/40648.

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Ochwoh, Victor Akangah. "The dynamics of phosphorus extractability, adsorption, and desorption rates as influenced by phosphorus applications and incubation times." Thesis, University of Pretoria, 2002. http://hdl.handle.net/2263/28636.

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In a study to investigate the fate of the applied P in soils, a red-sandy clayey soil (Ferric Luvisols) from Rustenburg (high P fixing) and a red-sandy loam soil (Ferric Acrisols) from Loskop (low P fixing) were used. Sequential P fractionations were used to determine the content of the different P pools to show which pool the applied P was transformed to. The soils treatments consisted of different Prates (0, 25, 50, 100, 150, and 200 mg kg-1), and incubation periods (1, 60, 120, 180, and 240 days) under a laboratory conditions. The sequential P fractionation procedure consisted of extraction with hydrous ferric oxide in a dialysis membrane tube (DMT-HFO), 0.5M NaHC03, O.1M NaOH-P, 1.0M HCI, concentrated HCI, and concentrated H2S04 + H2O2. Approximately 30 to 60 % of the added P were transformed into less labile P pools within one day and 80-90 % after 60 days. This transformation was faster in the Rustenburg than in the Loskop soil showing a higher P fixation capacity. A major part of the P transformation was to the -OH-P1 pool with a recovery of about 30%. In the second experiment an attempt was made to determine P desorption rates by successive DMT-HFO extractions (1, 7, 14, 28, and 56 days) after the transformations of the applied P. This was followed by the sequential extractions to determine the changes and distribution of the added P into different P pools as well as which pools the P was des orbed from. The Rustenburg and Loskop soils were treated to different Prates (0, 25, 50, 100, and 200 mg P kg-1) and incubation periods (1, 120, and 240 days). The cumulative DMT -HFO extraction curves for 56 days showed that desorption could continue for a much longer period. This property is important in the economical management of fertilizer applications rates. Results showed the transformations and distribution of the applied P during incubation periods and proved that all the stable soil P pools contributed to the labile P pool by different proportions after prolonged successive DMT-HFO extractions. Although Rustenburg soil is considered a high P fixing soil, the P release rates under laboratory conditions were high enough to meet the requirements of cotton and tobacco crops. Root systems of these crops do not exploit 100 % soil volume as this laboratory method, which could explain why these crops experience P deficiencies. It is envisage that by using this method the P releasing properties of a soil could be used to develop a P desorption model to determine how much extractable P, with a specific extractant, in a particular soil, should be available at the beginning of a growing season to sustain a high enough P releasing rate to meet the requirements of a certain crop up to the end of the growing season. To do this, a model to describe root development that represents the percentage of the soil exploited P desorption rates that simulate P uptake by plant roots will be necessary.
Thesis (DPhil (Plant Production: Horticulture))--University of Pretoria, 2006.
Plant Production and Soil Science
unrestricted
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Barthelemy, Kévin. "Adsorption des anions phosphate par des composés ferriques en vue du traitement des eaux usées : approche en réacteur homogène et en mode hydrodynamique contrôlé." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0237.

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Les travaux présentés dans ce mémoire sont consacrés à l'étude des processus d'adsorption des anions phosphate par la rouille verte ferrique carbonatée et la ferrihydrite. L'objectif final vise une application au traitement des eaux usées en milieu rural. La synthèse des deux oxydes de fer a été réalisée et leurs propriétés physico-chimiques caractérisées. Un intérêt particulier a été consacré à comparer les propriétés structurales de la rouille verte ferrique en fonction de différents paramètres de synthèse. Une étude approfondie des propriétés physico-chimiques de surface de la ferrihydrite par spectroscopie de photoélectrons X a quant à elle été réalisée. La réactivité de ces deux oxydes a ensuite été abordée en mode discontinu où l'équation cinétique du pseudo-second ordre et le modèle d'isotherme de Freundlich offrent les meilleurs ajustements. L'influence de divers paramètres a été prise en compte comme le pH, la force ionique, etc. Le mode continu a été envisagé sur un matériau de filtration constitué de l'oxyde de fer déposé sur de la pouzzolane. La méthode de fabrication ainsi que les conditions optimales de préparation du matériau de filtration ont été déterminées. Les mécanismes d'adsorption en condition de flux hydrodynamique ont alors mis en évidence des phénomènes advectifs, diffusifs et une régionalisation de l'eau régissant l'adsorption au sein de la colonne. Des informations telles que les capacités d'adsorption ou l'influence du débit sur le processus d'adsorption ont pu être également obtenues. Une expérience préliminaire sur une eau usée prétraitée met finalement en évidence une quantité adsorbée particulièrement intéressante pour une application industrielle potentielle
The Ph.D. work, presented in this manuscript, is devoted to evaluating phosphate adsorption process on carbonate ferric green rust and ferrihydrite. The main objective concerns an application for the treatment of waste water in rural areas. Both iron oxides are first synthesized and their physico-chemical properties characterized. The ferric green rust structural properties differences as a function of synthesis parameters such as aging period and addition of hydrogen peroxide solution is of particular interest. A detailed study of surface physico-chemical properties by X Photoelectron Spectroscopy is carried out in the case of ferrihydrite. The reactivity of these two iron oxides is then evaluated in batch experiments. Adsorption process follows the pseudo-second order kinetic equation and Freundlich isotherm model which give the best adjustments of experimental data. The influence of various parameters such as pH, ionic strength, etc on phosphate adsorption is also taken into account. Column experiments are afterwards carried out by using filtration material constituted of iron oxide deposited onto pozzolana. The optimal conditions to prepare this filtration material are naturally predetermined. Phosphate adsorption in hydrodynamic mode is characterized by advective and diffusive mechanisms and water regionalization which govern the adsorption process in the column. Moreover, phosphate adsorption capacity and flow rate influence on adsorption process are obtained. Finally, a preliminary experiment on a pre-treated waste water finally shows that the filtration material is potentially interesting for an industrial application
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Xie, Rongjing. "Ortho- and pyrophosphate sorption effects on zinc transformations in three Quebec soils." Thesis, McGill University, 1988. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75928.

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Crop-available zinc is affected by P-Zn interactions in soils. Orthophosphate (OP) additions may decrease or have no effect, while pyrophosphate (PP) may increase or have no effect on Zn solubility. Mechanisms involved in the interactions are not well understood and need to be quantified on agricultural soils subjected to P fertilization.
Top and sub-samples from three Quebec agricultural soils were equilibrated with OP or PP solutions, then with Zn solutions, and finally with solutions containing neither P nor Zn. The first equilibration evaluated P sorption effects on soil cation exchange capacity (CEC), the second equilibration evaluated Zn sorption (Zn$ sb{ rm s}$) after P sorption, and the third Zn desorption (Zn$ sb{ rm D}$) as related to added P. Subsequently, Zn fractions were extracted sequentially with KNO$ sb3$ (Zn$ sb{ rm KNO3}$), NaOH (Zn$ sb{ rm NaOH}$) solutions and concentrated HNO$ sb3$ + H$ sb2$O$ sb2$ (Zn$ sb{ rm HNO3}$). Autoclaved soils were used for OP and PP comparisons, and non-autoclaved soils were used for OP determinations.
Autoclaving reduced dithionite-citrate extractable Fe and Al materials. In both autoclaved and non-autoclaved soils, one mmole sorbed P as PP or OP resulted in increases in CEC from 0.52-1.24 mmole (+). Comparison between OP and PP in the autoclaved soils indicated that the increased CEC per mmole sorbed was greater with sorbed OP than with PP, while at the same rate of P addition, the absolute increased CEC was more with sorbed PP than with OP due to greater P sorption as PP compared to OP. Both sorbed OP or PP in autoclaved soils and sorbed OP in non-autoclaved soils increased specific Zn sorption in association with oxide materials. The effect was more significant with PP than with OP, as indicated by the observations: (1) P sorption increased Zn sorption but reduced Zn desorption, (2) P sorption reduced KNO$ sb3$- but increased NaOH- and HNO$ sb3$-extractable Zn, and (3) P sorption increased the difference between Zn sorbed and Zn extracted with KNO$ sb3$. These effects were more significant in coarser than finer textured soils. Results suggested that Zn fertilizers should be separated from P fertilizers to avoid enhanced Zn sorption and reduced Zn desorption.
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Babana, Amadou Hamadoun. "Mise au point d'un inoculant biologique pour le blé irrigué du Mali." Thesis, Université Laval, 2003. http://www.theses.ulaval.ca/2003/21179/21179.pdf.

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A cause du prix élevé des engrais importés au Mali, le phosphate naturel de Tilemsi (PNT) constitue une source de phosphore, locale, peu coûteuse pour les paysans. Dans plusieurs zones, malgré ses bonnes caractéristiques physiques et chimiques, les plantes cultivées, particulièrement le blé, ont faiblement répondu à l’application du PNT. À cause du besoin croissant d’améliorer biologiquement l’absorption du P par le blé, nous présentons dans ce travail les résultats de l’utilisation de microorganismes solubilisant le phosphore (MSP) dans un essai d’inoculation au champ. Dans la rhizosphère (Zone d’interactions intenses entre les racines et les microorganismes) et le rhizoplan (les microorganismes du rhizoplan ont ceux qui sont directement liés à la surface externe des racines) de trois cultivars de blé du Mali, 7 à 12% des microorganismes étaient capables de solubiliser le PNT. Six bactéries et deux champignons ont été sélectionnés, pour leur fort pouvoir de solubilisation du PNT en milieu liquide et sur milieu solide, et testés au champ à Koygour (Diré) en 2000-2001. Deux champignons Aspergillus amovari (C1), Penicillium chrysogenum (C13) et une bactérie Pseudomonas sp. (BR2) ont significativement amélioré la taille du blé (cv. Tétra) après 6 semaines, ainsi que, le poids et le contenu en P de la matière sèche (paille et graines) après 90 jours de croissance. Des essais au champ ont été réalisés à Koygour (Diré) en 2001-2002. Les traitements d’inoculation incluent C1, C13, BR2, C1+BR2, C13+BR2 et un contrôle en présence et à l’absence de Glomus intraradices (Gi). Les traitements de phosphore incluent le PNT, le phosphate biammoniacal (DAP) et un contrôle non fertilisé. La colonisation des racines de blé par les mycorhizes à vésicules et arbuscules (MVA) a été significativement améliorée avec Glomus intraradices quand la source de P utilisée est le PNT. La présence de BR2 améliore encore plus la colonisation des racines par les MVA. En général, les quantités de graines et paille récoltées ont été significativement améliorées après inoculation avec les microorganismes solubilisant le PNT et Glomus intraradices. La plus forte concentration de P dans les graines a été obtenue avec la co-inoculation avec C1+BR2 et Gi en présence de PNT, tandis que, les plantes inoculées avec BR2+Gi présentaient les plus fortes quantités de P dans la paille en présence du DAP.
Because of the high price of imported P-fertilizers in Mali, the Tilemsi rock phosphate (TRP) is a cheaper locally available P source alternative for farmers. In many areas regardless of its good physical and chemical characteristics, crops and particularly wheat showed very slow response to TRP. With the broad aim of biologically improving P uptake by wheat, in this work we describe the use of TRP solubilizing microorganisms in field inoculation trials. In 3 different Malian wheat cultivars, 4 to 12% of the rhizosphere microorganisms were able to dissolve TRP. Six bacterial and two fungal isolates were selected for their high P-solubilizing activity in solid and liquid media, and were tested in a field in Koygour (Diré) in 2000-2001. Two fungal isolates Aspergillus niger (C1) and Penicillium chrysogenum (C13) and Pseudomonas sp. (BR2) significantly increased plant heights after 60 days, and the fresh and dry matter yields and P-uptake after 90 days of growth. Field assays were performed in Koygour (Diré) in 2001-2002. Inoculation treatments included C1, C13, BR2, C1+BR2, C13BR2, and a control in the presence or absence of the AM fungus Glomus intraradices. P treatments included Tilemsi rock phosphate (TRP), phosphate biammoniacal (DAP) and an unfertilized control. The colonization of wheat root with AM was significantly higher following inoculation with G. intraradices, and when TRP was the P source used. The presence of Pseudomonas strain (BR2) improved root colonization by the AM fungus. In general, straw and grain yield improved significantly following inoculation with AM and phosphate solubilizing microorganisms. The highest P concentration in wheat grain and straw was recorded in treatment including a combinaison of AM, BR2 and C1 in the presence of TRP.
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Grimal, Jean-Yves. "Influence de l'exsudation racinaire de Zea mays L. Sur mobilisation de formes de phosphore difficilement biodisponibles." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL058N.

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L’influence de l'exsudation racinaire de Zea mays sur la mobilisation de formes de phosphore difficilement disponibles a été étudiée suivant trois niveaux d'approche. L’étude de l'adsorption d'un modèle d'exsudats (apg) et de mucilages racinaires sur une goethite a montré que l'apg et les mucilages diminuent l'adsorption des ions phosphate. L’effet le plus marqué est constaté lorsque les ions phosphate sont apportés sur le complexe mucilages-goethite. Dans ce cas, le mécanisme mis en jeu est de nature physique. L’enrobage de la goethite a probablement diminué le nombre de sites d'adsorption des ions phosphate. Des cultures en conditions hydroponiques stériles ont permis d'examiner le comportement du maïs en présence d'ions phosphate adsorbés sur une goethite. Dans ces conditions expérimentales, la plante est capable de prélever jusqu'à 23% du phosphore initialement adsorbé. La réponse du maïs à cette contrainte se traduit aussi par une modification des flux de phosphore à l'intérieur de la plante. Le rôle des phosphatases racinaires dans l'acquisition du phosphore a été étudié en mettant à la disposition du maïs le glucose-1-phosphate et le myoinositol hexaphosphate. Les activités phosphatasiques ont été détectées à la surface des racines, dans la solution nutritive ainsi qu’à la surface de la goethite. Les possibilités d'action des phosphatases sont liées à l'accessibilité des phosphates organiques et des enzymes, adsorption sur les colloïdes ou précipitation. Ces résultats montrent que les composés diffusibles (mucilages) par leur action physique et les composés carbonés diffusibles (phosphohydrolases notamment) contribuent à augmenter la mobilité du phosphore à partir de sources peu accessibles pour la plante dans la rhizosphère
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Books on the topic "Phosphates – Absorption and adsorption"

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Fosfatogennai͡a transformat͡sii͡a pochv. Moskva: Nauka, 1995.

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Foundation, AWWA Research, American Water Works Association, and IWA Publishing, eds. Water residuals to reduce soil phosphorous. Denver, CO: AWWA Research Foundation/American Water Works Association/IWA Pub., 2006.

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Zarzycki, Roman. Absorption: Fundamentals & applications. Oxford: Pergamon Press, 1993.

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Adsorption by carbons. Amsterdam: Elsevier, 2008.

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Gas separation by adsorption processes. London: Imperial College Press, 1997.

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Yang, R. T. Gas separation by adsorption processes. Singapore: World Scientific, 1997.

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Yang, R. T. Gas separation by adsorption processes. Boston: Butterworths, 1987.

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W, Cole Milton, and Zaremba Eugene 1946-, eds. Physical adsorption: Forces and phenomena. Oxford: Clarendon Press, 1997.

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Collision-induced absorption in gases. Cambridge [England]: Cambridge University Press, 1993.

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Chattopadhyay, P. Absorption & stripping. New Delhi: Asian Books, 2007.

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Book chapters on the topic "Phosphates – Absorption and adsorption"

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Boyadjiev, Christo, Maria Doichinova, Boyan Boyadjiev, and Petya Popova-Krumova. "Absorption-Adsorption Method." In Modeling of Column Apparatus Processes, 283–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28259-6_11.

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Boyadjiev, Christo, Maria Doichinova, Boyan Boyadjiev, and Petya Popova-Krumova. "Absorption–Adsorption Method." In Modeling of Column Apparatus Processes, 417–35. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-89966-4_16.

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Errassifi, F., A. Menbaoui, H. Autefage, L. Benaziz, S. Ouizat, V. Santran, S. Sarda, et al. "Adsorption on Apatitic Calcium Phosphates: Applications to Drug Delivery." In Ceramic Transactions Series, 159–74. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9780470909898.ch16.

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Yang, Wansheng, Shuli Liu, Xiaoqiang Zhai, Yin Bi, Zhangyuan Wang, and Xudong Zhao. "Solar Desiccant (Absorption/Adsorption) Cooling/Dehumidification Technologies." In Advanced Energy Efficiency Technologies for Solar Heating, Cooling and Power Generation, 211–86. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17283-1_7.

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Kaplan, Drora. "Absorption and Adsorption of Heavy Metals by Microalgae." In Handbook of Microalgal Culture, 602–11. Oxford, UK: John Wiley & Sons, Ltd, 2013. http://dx.doi.org/10.1002/9781118567166.ch32.

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Skrzypczak, Dawid, Katarzyna Mikula, Daria Kocek, Grzegorz Izydorczyk, Rafał Taf, and Anna Witek-Krowiak. "Adsorption of Phosphates on Modified Eggshells - Batch and Fixed-Bed Column Process." In Practical Aspects of Chemical Engineering, 412–22. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39867-5_43.

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Noll, Kenneth E., and Jerry W. Crowder. "Control of Gases and Vapors by Adsorption, Absorption and Condensation." In Industrial Air Pollution, 145–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-76051-8_16.

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Pan, Yong, Zhe Zhang, Xiong-Shi Tong, Hai Li, Xiao-Hui Wang, Bei Liu, Chang-Yu Sun, Lan-Ying Yang, and Guang-Jin Chen. "Separation of Methane from Biogas by Absorption-Adsorption Hybrid Method." In Acid Gas Extraction for Disposal and Related Topics, 359–76. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781118938652.ch23.

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Carbajal, Jose L., and Ralph E. White. "Adsorption and Absorption of Hydrogen in Metals FTIR and RT Approach." In Electrochemistry in Transition, 339–57. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-9576-2_19.

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Chechevatov, A. I., Y. S. Miroshnichenko, T. N. Myasoyedova, Yu V. Popov, and G. E. Yalovega. "Investigations of the Capability to Heavy Metals Adsorption Humic Acids: Correlation Between Structure and Absorption Properties." In Springer Proceedings in Physics, 99–110. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-56062-5_9.

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Conference papers on the topic "Phosphates – Absorption and adsorption"

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von Felten, A. "DETECTION OF LUPUS ANTICOAGULANTS BY THE “INSIDE-OUT MEMBRANE ADSORPTION TEST”: aPTT IS SHORTENED AFTER INCUBATION OF THE PLASMA WITH THE ADSORBENT." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644238.

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Prolongation of the aPTT in a mixture of a patient’s plasma with normal plasma is characteristic for the presence of a coagulation inhibitor. Since inhibitors directed against individual blood coagulation factors differ in their clinical significance from a lupus anticoagulant (LA), a fast and reliable distinction from each-other would be highly desirable. The test presented which is based on the absorption of antiphospholipid antibodies by use of a stable phospholipid adsorbent largely fullfills this demand.Method 1. Preparation of the LA-adsorbent (modified acc. to Steck et al., Science 168:255, 1970): Fresh human RBC (bl. gr. 0, in 0.5% EDTA) are washed (NaCl, 0.15m / phosphate buffer,0.005m, pH8.0) and lysed in phosphate buffer alone. The membranes are washed with the same buffer (centrifugations: 40’000g, lOmin, 4°C) and incubated 60 min on ice in phosphate buffer, 0.0005m. After centrifugation, the sediment is resuspended in an equal volume of buffer (0.0005m, with merthiolate 0.1%), homogenized and centrifuged in portions of lml; the supernatant is carefully removed. The adsorbent, stored at 4°C in capped tubes, is stable for at least three months.2. Performance of test: To 600ul of patient’s plasma mixed with 600ul normal plasma (citrated), 12ul of heparin (501U/ml) are added. 600ul of the mixture are given to the LA-adsorbent, vorte-xed, incubated (room temp., 30min) and centrifuged (40’000g). From the supernatant as well as the not adsorbed portion of the plasma mixture, heparin is eliminated by adding ECTEOLA-cellulose. After centrifugation, aPTT is determined in both supernatant samples. Results The test is positive, i.e. LA is present, if aPTT is shortened by at least 5 sec after treatment with LA-adsorbent. *not diluted; other samples are mixed 1:1 with normal plasma
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Alvarez Merino, Jose Carlos, and Kazuo Hatakeyama. "Technology surveillance of the solar refrigeration by absorption/adsorption." In 2016 Portland International Conference on Management of Engineering and Technology (PICMET). IEEE, 2016. http://dx.doi.org/10.1109/picmet.2016.7806767.

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Kusrini, Eny, Maya Lukita, Misri Gozan, Bambang Heru Susanto, Dedy Alharis Nasution, Arif Rahman, and Cindy Gunawan. "Enrichment process of biogas using simultaneous Absorption - Adsorption methods." In RENEWABLE ENERGY TECHNOLOGY AND INNOVATION FOR SUSTAINABLE DEVELOPMENT: Proceedings of the International Tropical Renewable Energy Conference (i-TREC) 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4979244.

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Samarina, Tatiana, and Esther Takaluoma. "Ammonia Recovery from Wastewaters by Adsorption with subsequent Transmembrane Chemical Absorption." In The 6th World Congress on New Technologies. Avestia Publishing, 2020. http://dx.doi.org/10.11159/icepr20.146.

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Ha, Juyoung, François Farges, and Gordon E. Brown. "Adsorption and Precipitation of Aqueous Zn(II) on Hematite Nano- and Microparticles." In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644487.

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Sakamaki, Masako, Hirokazu Takahashi, Takehisa Konishi, Atsuyuki Inoue, and Takashi Fujikawa. "X-Ray Absorption Fine Structure Spectroscopy Study of Arsenate Adsorption on Schwertmannite." In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644498.

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Suzuki, Akane, Yasuhiro Inada, Kiyotaka Asakura, and Masaharu Nomura. "Time-Resolved DXAFS Study of Adsorption and Release of Hydrogen on Pt/MCM-41." In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644629.

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Joos, Andreas, Karin Dietl, and Gerhard Schmitz. "Thermal Separation: An Approach for a Modelica Library for Absorption, Adsorption and Rectification." In The 7 International Modelica Conference, Como, Italy. Linköping University Electronic Press, 2009. http://dx.doi.org/10.3384/ecp09430102.

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Ravel, B., S. D. Kelly, D. Gorman-Lewis, M. I. Boyanov, J. B. Fein, and K. M. Kemner. "A pH-Dependent X-Ray Absorption Spectroscopy Study of U Adsorption to Bacterial Cell Walls." In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644474.

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Cancès, Benjamin, Marc Benedetti, François Farges, and Gordon E. Brown. "Adsorption Mechanisms of Trivalent Gold onto Iron Oxy-Hydroxides: From the Molecular Scale to the Model." In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644479.

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Reports on the topic "Phosphates – Absorption and adsorption"

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Croft, David T., and David K. Friday. Predicting Absorption Equilibria of Mixtures: Comparison of Potential Theory and Ideal Adsorption Solution Theory. Fort Belvoir, VA: Defense Technical Information Center, October 1999. http://dx.doi.org/10.21236/ada370837.

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Ward, Donald K., Xiaowang Zhou, Richard A. Karnesky, Robert Kolasinski, Michael E. Foster, Konrad Thurmer, Paul Chao, et al. Understanding H isotope adsorption and absorption of Al-alloys using modeling and experiments (LDRD: #165724). Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1222665.

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