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

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Rumhayati, Barlah, Chasan Bisri, and Wahyu O. Fajarina. "THE PERFORMANCE OF CHITOSAN-FERRIHIDRYTE MEMBRANE FOR PHOSPHATE UPTAKE." Indonesian Journal of Chemistry 9, no. 3 (June 24, 2010): 404–9. http://dx.doi.org/10.22146/ijc.21506.

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The uptake of orthophosphate onto the chitosan-ferrihydrite membrane has been studied. The membrane was proposed as a new binding layer of DGT technique. Membrane was prepared from a mixture of chitosan solution with ferrihydrite (FeOOH) paste and was crosslinked with glutaraldehyde. As a result, the uptake of orthophosphate was slow. The maximum adsorption capacity was reached at pH 5.0 and 8.0. It was mainly due to electrostatic attraction of phosphate ions to the protonated free amino groups of chitosan and to active sites of ferrihydrite. Desorption could be occurred optimally using 0.3 M of sulphuric acid. The absorption of SO42- ion to the protonated amino groups and the formation of ionic crosslinking could exchange and desorb phosphate ions. Ferrihydrite was eluted also by the acid. However, the eluted ferrihydrite readsorbed phosphate ions, resulted in minimizing the analysed free phosphate. Keywords: adsorption, phosphate, chitosan-ferrihydrite/glutaraldehide membrane, DGT technique

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12

Darvishi, Atefeh, and Hadi Bakhshi. "Poly(sodium methacrylate)/eggshell particles hydrogel composites as dye sorbent." Water Science and Technology 74, no. 12 (September 26, 2016): 2807–18. http://dx.doi.org/10.2166/wst.2016.453.

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Eggshell (ES) particles as an available and low-cost waste material were utilized to prepare novel hydrogel composites for dye adsorbing application. For this purpose, solution polymerization of sodium methacrylate was carried out in the presence of ES particles with various size ranges. Results showed that incorporation of ES particles resulted in heterogeneous pores and cavities in the structure of the poly(sodium methacrylate) (PNaMA) matrix. Hydrogel composites with lower content (20 wt%) and smaller size (<75 μm) of ES particles presented higher water absorption capacity. The equilibrium water absorption values in distilled water were higher than phosphate buffered saline medium. ES particles showed low methylene blue (MB) and crystal violet (CV) adsorption capacities due to electrostatic repulsion of the positively charged species on the surface of ES particles and dye molecules. In contrast, hydrogel composites depicted fast and considerable dye adsorbability. The combination of 60 wt% ES particles within PNaMA provided a cost-effective adsorbent with similar CV adsorption capacity compared with the unfilled matrix, while MB removal was slightly decreased. The dye adsorption by either ES particles or hydrogel composites followed the pseudo-second-order kinetics, indicating that chemical sorption is the rate-limiting step for both of them.

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13

Yang, Y., S. Takizawa, H. Sakai, M. Murakami, and N. Watanabe. "Removal of organic matter and phosphate using ferrihydrite for reduction of microbial regrowth potential." Water Science and Technology 66, no. 6 (September 1, 2012): 1348–53. http://dx.doi.org/10.2166/wst.2012.334.

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Dissolved organic matter (DOM) and phosphate in reclaimed water promote microbial growth in distribution systems and deteriorate water quality. In this study, we tested ferrihydrite (Fh) for its potential to remove both DOM and phosphate in order to control bacterial regrowth. Adsorption kinetics on Fh revealed that phosphate has a higher affinity with Fh than has DOM. The removal efficiency of DOM increased at lower pH. Fourier transform infrared spectroscopy (FT-IR) spectra of freeze-dried Fh showed that adsorbed DOM was rich in carboxyl/hydroxyl functional groups, indicating anion exchange at Fh surfaces to be a major mechanism, especially at low pH. Fh preferentially removed DOM greater than 1,000 Da. Specific ultraviolet absorption (SUVA) at 254 nm and DOC results suggest Fh adsorption removes more hydrophilic DOM than the coagulation–sand filtration process. Reduction of bacterial regrowth potential (BRP) by Fh was comparable to that of the coagulation–sand filtration process, which indicated that phosphorus was not the rate-limiting factor of microbial growth.

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14

Widjonarko, Dian Maruto, Jumina Jumina, Indriana Kartini, and Nuryono Nuryono. "Phosphonate Modified Silica for Adsorption of Co(II), Ni(II), Cu(II), and Zn(II)." Indonesian Journal of Chemistry 14, no. 2 (July 25, 2014): 143–51. http://dx.doi.org/10.22146/ijc.21251.

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A new phosphonate modified silica (PMS) has been investigated for adsorption of Co(II), Ni(II), Cu(II), and Zn(II) in aqueous solution. The adsorbent was modified of silica by immobilizing aminoethyl dihydrogen phosphate (AEPH2) on 1,4-dibromobutane grafted silica. The physicochemical of the adsorbent was investigated using Fourier Transform Infra-red (FTIR) spectroscopy, X-ray Fluorescence (XRF), and N2 gas adsorption/desorption. The adsorption study was carried out in a batch system by mixing solution of metal ions at various pHs, contact times, and initial metal ion concentrations. The unadsorbed metals were determined by Flame Atomic Absorption Spectrophotometry (FAAS). Result of characterization showed that PMS has been successfully prepared. The product contained 45.99% (w/w) silica and 1.33% (w/w) phosphorous with surface area, pore volume, and pore size of 115.3 m2g-1; 0.7578 mLg-1; and 131.44 Å, respectively. Adsorption of metal ions on PMS occurred quite fast, less than 30 min. Modification of phosphonate on silica increased the adsorption capability, up to 8 times higher than that of unmodified silica, depending on metal ion type and pH solution. The capacity order of the metals adsorption was Cu(II)>Co(II)>Ni(II)>Zn(II). Based on the adsorption characteristic, the adsorbent is promising to be applied as a material for solid phase extraction of transition metal ions.

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15

Li, Lin Bo, Jun Zhu, Qi Wang, and Jun Yang. "Adsorption of Phosphate from Aqueous Solution with Blast Furnace Slag Activated by Hydrated Lime as Sorbent." Materials Science Forum 620-622 (April 2009): 643–46. http://dx.doi.org/10.4028/www.scientific.net/msf.620-622.643.

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This paper describes a method of removing phosphate (P) from aqueous solution by sorbent prepared with amorphous blast furnace slag (BFS) and hydrated lime. An orthogonal experiment was carried out to investigate the factors of hydration time, slurrying temperature and the weight ratio of blast furnace slag /hydrated lime and water/solid on the reactivity of the sorbent. Chemical composition of BFS was analyzed by atomic absorption spectrometry, microstructure and phase analysis of samples were conducted by SEM and XRD. It is found that all sorbents prepared show higher P adsorption capacity than single blast furnace slag.

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16

Bairwa, Rajendra, Mamta ., Nintu Mandal, Nilanjan Chattopadhyaya, and Neeraj Bagoria. "Adsorption and Desorption of zinc in soil and its implication." International Journal of Agricultural Invention 3, no. 02 (November 27, 2018): 191–202. http://dx.doi.org/10.46492/ijai/2018.3.2.17.

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Zn availability mostly regulated through adsorption-desorption on soil (or adsorbent). Fly ash (FA) application influence on zinc adsorption-desorption in recommended chemical fertilizer (RDF) and farmyard manure (FYM) treatments of acidic Inceptisols of Assam. Zinc adsorption was better explained by Freundlich over the Langmuir adsorption equation. Adsorption was greatest in the treatment receiving FA only at 15 t ha−1 and least in the treatment receiving RDF 50 percent + FYM 5 t ha−1 + FA 5 t ha−1. Ni and Zn co-sorption to aluminium oxides (γ-Al2O3) in binary-sorbate systems were compared to their sorptionin single-sorbate systems as a function of pH using both macroscopic batch experiments and synchrotron-based X-ray absorption fine structure spectroscopy At pH 6.0, Ni and Zn were sorbed as inner-sphere surface complexes and competed for the limited number of reactive sites on γ-Al2O3.In binary-sorbate systems, Ni had no effect on Zn sorption, owning to its lower affinity for the metal oxide surface. In contrast, Zn had a higher affinity for the metal oxide surface and reduced Ni sorption. The influence of P on the Zn adsorption capacity of eight surface horizons in soils on granite and amphibolites materials. The presence of P, especially at high concentrations, was found to boost Zn adsorption. The effect was more marked in the soils on amphibolite, which contained increased concentrations of Fe and Al oxides relative to those on granite. The increased adsorption of zinc by effect of the presence of phosphate is ascribed primarily to the formation of a P–Zn complex in colloid surfaces.Studies should be undertaken while considering adsorption and desorption capacities of Zn for soils as well as ionic interactions for better Zn management in soils.

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17

Fatimah, Budi Pratama Tarigan, and Alfikri Ramadhan. "Aktivasi Bottom Ash dari Pembakaran Batubara untuk Menurunkan Kandungan Senyawa Fosfat dalam Air." Jurnal Teknik Kimia USU 8, no. 2 (September 29, 2019): 72–78. http://dx.doi.org/10.32734/jtk.v8i2.2033.

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This study aims to look at the effect of bottom ash activation with NaOH on the morphological structure and content of the elements contained in bottom ash and see the effect of activation on the absorption of phosphate compounds in water by bottom ash. Bottom ash from PT SOCIMAS coal combustion has been activated with NaOH and has been used to adsorb phosphate. Phosphate used in the form of KH3PO4. Bottom ash was first characterized by SEM-EDS to see the morphological structure and the element content contained in the bottom ash. Bottom ash mass variations used are (1, 2, and 3 grams), and particle size (50-70 mesh, 70-110 mesh, and 110-140 mesh). The activation process lasts for 5 hours using 3 M NaOH, then washed to pH 7. The bottom ash is activated then characterized again with SEM-EDS to ensure the impurities present in the bottom ash are reduced. Furthermore, bottom ash is used to adsorb phosphate with time variations of 20, 40, and 60 minutes. The most effective adsorption capacity (6.39 mg / g) is at the 20th minute with a particle size of 110-140 mesh and a bottom ash mass of 1 gram. The Freundlich and Langmuir isotherm model is used to describe the phosphate ion adsorption isotherm by the bottom ash. Based on the data obtained, the isotherm model suitable for this research is the Freudlich (R2 = 0.9721) and Langmuir (R2 = 0.9505) isotherm model.

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18

Guo, Fang, and Jun Li. "Flotation Behavior Difference between the Pure Quartz and the Quartz Gangue of a Siliceous-Calcareous Phosphate Ore with Fine Size." Applied Mechanics and Materials 448-453 (October 2013): 3855–58. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3855.

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Flotation behavior of pure quartz is difference from that of the quartz gangue of a siliceous-calcareous phosphate ore with fine size. The flotation of pure quartz can attain satisfactory results at alkaline conditions. The IR analysis shows that adsorption intensity of quaternary ammonium salt is stronger which is likely to explain its preferable flotation performance for pure quartz. However, for quartz gangue of phosphate ore, the results are completely opposite. The acid condition is more favorable for reverse flotation than alkaline condition due to the existence of carbonate mineral. The alkyl amine salt is a more effective collector to remove quartz gangue from siliceous-calcareous phosphate ore, especial with 12 carbon chain. Zeta potential of the ore treated by it is almost higher than that by the other alkyl amine salts (with 10, 14 or 18 carbon chain), which suggests its stronger absorption on ore particles.

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19

Oshima, Sho, Taira Sato, Michiyo Honda, Yasushi Suetsugu, Kazuhide Ozeki, and Masanori Kikuchi. "Fabrication of Gentamicin-Loaded Hydroxyapatite/Collagen Bone-Like Nanocomposite for Anti-Infection Bone Void Fillers." International Journal of Molecular Sciences 21, no. 2 (January 15, 2020): 551. http://dx.doi.org/10.3390/ijms21020551.

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A gentamicin-loaded hydroxyapatite/collagen bone-like nanocomposite (GNT-HAp/Col) was fabricated and evaluated for its absorption–desorption properties, antibacterial efficacy, and cytotoxicity. The hydroxyapatite/collagen bone-like nanocomposite (HAp/Col) powder was mixed with gentamicin sulfate (GNT) in phosphate-buffered saline (PBS) at room temperature. After 6 h mixing, the GNT adsorption in all conditions reached plateau by Langmuir’s isotherm, and maximum GNT adsorption amount was 34 ± 7 μg in 250 μg/mL GNT solution. Saturated GNT-loaded HAp/Col powder of 100 mg was soaked in 10 mL of PBS at 37 °C and released all GNT in 3 days. A shaking culture method for a GNT extraction from the GNT-HAp/Col and an inhibition zone assay for the GNT-HAp/Col compact showed antibacterial efficacy to Escherichia coli (E. coli) at least for 2 days. From the release profile of the GNT from the GNT-HAp/Col powder, antibacterial efficacy would affect E. coli at least for 3 days. Further, no cytotoxicities were observed on MG-63 cells. Thus, the GNT-HAp/Col is a good candidate of bioresorbable anti-infection bone void fillers by prevention initial infections, which is the primary cause of implant-associated infection even for rapid bioresorbable materials.

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20

Ali, M. E., U. Hashim, S. Mustafa, Y. B. Che Man, and Kh N. Islam. "Gold Nanoparticle Sensor for the Visual Detection of Pork Adulteration in Meatball Formulation." Journal of Nanomaterials 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/103607.

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We visually identify pork adulteration in beef and chicken meatball preparations using 20 nm gold nanoparticles (GNPs) as colorimetric sensors. Meatball is a popular food in certain Asian and European countries. Verification of pork adulteration in meatball is necessary to meet the Halal and Kosher food standards. Twenty nm GNPs change color from pinkish-red to gray-purple, and their absorption peak at 525 nm is red-shifted by 30–50 nm in 3 mM phosphate buffer saline (PBS). Adsorption of single-stranded DNA protects the particles against salt-induced aggregation. Mixing and annealing of a 25-nucleotide (nt) single-stranded (ss) DNA probe with denatured DNA of different meatballs differentiated well between perfectly matched and mismatch hybridization at a critical annealing temperature. The probes become available in nonpork DNA containing vials due to mismatches and interact with GNPs to protect them from salt-induced aggregation. Whereas, all the pork containing vials, either in pure and mixed forms, consumed the probes totally by perfect hybridization and turned into grey, indicating aggregation. This is clearly reflected by a well-defined red-shift of the absorption peak and significantly increased absorbance in 550–800 nm regimes. This label-free low-cost assay should find applications in food analysis, genetic screening, and homology studies.

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21

Kunin, Alexey V. "MECHANOCHEMICAL HYDROPHOBIZATION OF MONOAMMONIUM PHOSPHATE." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 2 (January 29, 2021): 87–94. http://dx.doi.org/10.6060/ivkkt.20216402.6345.

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Here, we investigated the influence of mechanical treatment on hydrophobization of monoammonium phosphate (MAP) with organosilicon liquid and silicon dioxide in order to obtain the main component of multipurpose fire extinguishing powders. We estimated hydrophobic properties of mixtures of various compositions. Based on the obtained results, the optimal content of hydrophobizing agents for obtaining monoammonium phosphate with the best hydrophobic properties was established. It is shown that the use of only organosilicon liquid for mechanochemical hydrophobization of MAP is not enough to achieve required values for water repellency, tendency to aggregation, bulk density and particle size distribution. According to GOST R 53280.4-2009, the ability to repel water (powders should not completely absorb water droplets) should be at least 120 min; the tendency to caking (mass of the formed aggregates) should not exceed 2% of the total mass of the sample; the apparent density of uncompacted and compacted powders should be at least 700 and 1000 kg/m3, respectively. It was found that in order to achieve the specified parameters, the mechanochemical hydrophobization of monoammonium phosphate should include modification of the mixture which contains 95 wt. % ammonium phosphate, 4.5 wt. % silicon dioxide and 0.5 wt. % hydrophobizing organosilicon liquid (HOL) in a mill with shock-shear loading at an input energy of 100-110 J/g. The absence of moisture in the raw material (preliminary drying of MAP particles) allows us to obtain a finer-grained product with a low tendency to moisture absorption. The process of mechanochemical hydrophobization of MAP can be described in the following way. During grinding hydrophobized silicon dioxide covers the particles of monoammonium phosphate, resulting in blocking active centers of adsorption and creating a structural and mechanical barrier that prevents particle aggregation.

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22

Maia, Marcella Torres, Ana Lorena de Brito Soares, Matheus Afio Caetano, Fábia Karine Andrade, Enrique Rodríguez-Castellón, and Rodrigo Silveira Vieira. "Biomimetic Strontium Substituted Calcium Phosphate Coating for Bone Regeneration." Coatings 11, no. 8 (July 29, 2021): 908. http://dx.doi.org/10.3390/coatings11080908.

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Cellulose acetate (CA)/strontium phosphate (SrP) hybrid coating has been proposed as an effective strategy to build up novel bone-like structures for bone healing since CA is soluble in most organic solvents. Strontium (Sr2+) has been reported as a potential agent to treat degenerative bone diseases due to its osteopromotive and antibacterial effects. Herein, bioactive hybrid composite SrP-based coatings (CASrP) were successfully produced for the first time. CASrP was synthesized via a modified biomimetic method (for 7—CA7dSrP, and 14 days—CA14dSrP), in which the metal ion Sr2+ was used in place of Ca2+ in the simulated body fluid. Energy-dispersive X-ray (EDX) and Fourier transform infrared spectroscopy (FTIR) analysis confirmed the SrP incorporation chemically in the CASrP samples. Atomic absorption spectroscopy (AAS) supported EDX data, showing Sr2+ adsorption into CA, and its significant increase with the augmentation of time of treatment (ca. 92%—CA7dSrP and 96%—CA14dSrP). An increment in coating porosity and the formation of SrP crystals were evidenced by scanning electron microscopy (SEM) images. X-ray diffraction (XRD) evidenced a greater crystallinity than CA membranes and a destabilization of CA14dSrP structure compared to CA7dSrP. The composites were extremely biocompatible for fibroblast and osteoblast cells. Cell viability (%) was higher either for CA7dSrP (48 h: ca. 92% and 115%) and CA14dSrP (48 h: ca. 88% and 107%) compared to CA (48 h: ca. 70% and 51%) due to SrP formation and Sr2+ presence in its optimal dose in the culture media (4.6–9 mg·L−1). In conclusion, the findings elucidated here evidence the remarkable potential of CA7dSrP and CA14dSrP as bioactive coatings on the development of implant devices for inducing bone regeneration.

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23

Adam, Nadia. "A Wet-Chemical and Phosphorus K-edge X-ray Absorption Near Edge Structure Investigation of Phosphate Adsorption on Binary Mixtures of Ferrihydrite and Calcite: Implications for Phosphorus Bioavailability." Soil Science Society of America Journal 81, no. 5 (August 31, 2017): 1079–87. http://dx.doi.org/10.2136/sssaj2016.10.0342.

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24

Forster, Paul M., Juergen Eckert, Jong-San Chang, Sang-Eon Park, Gérard Férey, and Anthony K. Cheetham. "Hydrogen Adsorption in Nanoporous Nickel(II) Phosphates." Journal of the American Chemical Society 125, no. 5 (February 2003): 1309–12. http://dx.doi.org/10.1021/ja028341v.

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25

Hamdani, K., and K. L. Cheng. "Adsorption of biochemically significant phosphates on silica." Colloids and Surfaces 63, no. 1-2 (May 1992): 29–31. http://dx.doi.org/10.1016/0166-6622(92)80065-a.

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26

Clearfield, A. "Ion exchange and adsorption in layered phosphates." Materials Chemistry and Physics 35, no. 3-4 (October 1993): 257–63. http://dx.doi.org/10.1016/0254-0584(93)90141-8.

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27

Edet, Uduakobong A., and Augustine O. Ifelebuegu. "Kinetics, Isotherms, and Thermodynamic Modeling of the Adsorption of Phosphates from Model Wastewater Using Recycled Brick Waste." Processes 8, no. 6 (June 3, 2020): 665. http://dx.doi.org/10.3390/pr8060665.

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Phosphates in wastewater at elevated concentrations cause eutrophication of water bodies and their removal from treated wastewater is essential before effluents are discharged to the environment. Phosphates are predominately removed during wastewater treatment by chemical precipitation which is usually expensive and has a significant environmental footprint. The purpose of this study was to investigate the effectiveness of waste recycled bricks as adsorbent for phosphate removal during wastewater treatment. The kinetics, isotherms, and thermodynamics of adsorption were investigated to establish the mechanisms of adsorption. The results showed that adsorption capacities increased with an increase in contact time, adsorbent dosage, and initial phosphate concentration. The kinetic study indicated that adsorption was governed by several mechanisms with various processes dominating different stages of the adsorption. The adsorption process was better represented by the pseudo-second-order kinetics and the Langmuir isotherm adequately described the adsorption of phosphates onto brick particles with a maximum adsorption capacity of 5.35 mg/g. The thermodynamic studies showed that the adsorption process was exothermic and proceeded spontaneously, demonstrating that waste bricks can be used as a sustainable alternative for the effective removal of phosphates from wastewater.

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28

Sawada, K., N. Abdel-Aal, H. Sekino, and K. Satoh. "Adsorption of inorganic phosphates and organic polyphosphonate on calcite." Dalton Transactions, no. 3 (January 2, 2003): 342–47. http://dx.doi.org/10.1039/b209758n.

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29

Vlasova, N. N., and O. V. Markitan. "Adsorption of Inorganic Phosphates on a Titanium Dioxide Surface." Colloid Journal 82, no. 3 (May 2020): 245–53. http://dx.doi.org/10.1134/s1061933x2003014x.

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30

Mdlalose, Lindani, Mohammed Balogun, Katlego Setshedi, Luke Chimuka, and Avashnee Chetty. "Adsorption of phosphates using transition metals-modified bentonite clay." Separation Science and Technology 54, no. 15 (November 20, 2018): 2397–408. http://dx.doi.org/10.1080/01496395.2018.1547315.

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31

Franke, R., and J. Hormes. "The P K-near edge absorption spectra of phosphates." Physica B: Condensed Matter 216, no. 1-2 (December 1995): 85–95. http://dx.doi.org/10.1016/0921-4526(95)00446-7.

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32

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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33

Bertazzo, S., and Celso A. Bertran. "Dissolution Kinetics of Nanoparticulate Calcium Phosphates and Inorganic Bone Phase." Key Engineering Materials 309-311 (May 2006): 527–32. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.527.

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In this work, the dissolution of calcium phosphates was studied through the calcium ion concentration, determined during the dissolution process in SBF (Simulated Body Fluid) at pH 6.35, 7.00 and 7.40, at 37oC. The results allowed the determination of the number of adsorption sites (ns) on the surface of the phosphates. Regardless of previous knowledge of the Ca/P ratio and crystallinity of the studied phosphates, the ns values provide the evidence that at the end of the dissolution process, the surfaces of the phosphates are similar.

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34

Guan, Xiao-Hong, Guang-Hao Chen, and Chii Shang. "COMPETITIVE ADSORPTION BETWEEN ORTHOPHOSPHATE AND OTHER PHOSPHATES ON ALUMINUM HYDROXIDE." Soil Science 170, no. 5 (May 2005): 340–49. http://dx.doi.org/10.1097/01.ss.0000169908.79614.db.

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35

Bjelopavlic, Mick, John Ralston, and Geoffrey Reynolds. "Adsorption of Monoalkyl Phosphates at the Zircon–Aqueous Solution Interface." Journal of Colloid and Interface Science 208, no. 1 (December 1998): 183–90. http://dx.doi.org/10.1006/jcis.1998.5778.

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36

Ohta, Kazushi, Hideki Monma, and Satoshi Takahashi. "Adsorption characteristics of proteins on calcium phosphates using liquid chromatography." Journal of Biomedical Materials Research 55, no. 3 (2001): 409–14. http://dx.doi.org/10.1002/1097-4636(20010605)55:3<409::aid-jbm1030>3.0.co;2-z.

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37

Wijesinghe, Kalpani E. H., Rasika E. A. Dissanayake, Sithy S. Iqbal, Namal Priyantha, and Mohamed C. M. Iqbal. "Adsorption of phosphates from water by two polymer-silicate composites." Bioremediation Journal 24, no. 4 (August 27, 2020): 231–50. http://dx.doi.org/10.1080/10889868.2020.1811631.

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38

Tvardovskii, A. V. "A common approach to adsorption and absorption: Polymolecular adsorption." Bulletin of the Russian Academy of Sciences Division of Chemical Science 41, no. 4 (April 1992): 603–7. http://dx.doi.org/10.1007/bf01150877.

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39

Pozas-Tormo, R., L. Moreno-Real, M. Martínez-Lara, and S. Bruque-Gamez. "Layered metal uranyl phosphates. Retention of divalent ions by amine intercalates of uranyl phosphates." Canadian Journal of Chemistry 64, no. 1 (January 1, 1986): 30–34. http://dx.doi.org/10.1139/v86-007.

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HUO2PO4•4H2O (HUP) forms a laminar intercalate with butylamine, c = 29.30(5) Å, which accepts cationic metals in exchange for the n-butylammonium ions. Hydrated uranyl metal phosphates M(UO2PO4)2•nH2O (M = Mn, Co, Ni, Cu, Zn, Cd) are obtained by ionic exchange and were studied by thermal analysis and X-ray diffraction. The tetragonal structures of all these product compounds are derived from HUP. The diffuse electronic reflectance spectra of every sample show characteristic [Formula: see text] absorption bands. In the spectra of the Co, Ni, and Cu phosphates there are other bands in the 500–800 nm zone compatible with their observed aquocation transitions.

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40

Zhang, Xiaoxing, Li Zhang, Hui Liu, Binxia Cao, Libo Liu, and Weimin Gong. "Structure, morphology, size and application of iron phosphate." REVIEWS ON ADVANCED MATERIALS SCIENCE 59, no. 1 (December 14, 2020): 538–52. http://dx.doi.org/10.1515/rams-2020-0039.

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AbstractIron phosphates have rich chemical structures with various morphologies and sizes. Since they are environment friendly with good biocompatibility, they have good performances in the fields of catalysis and battery electrode material rising in recent years, as well as in the traditional fields like agriculture and steel. They also have important applications in adsorption, separation and concentration due to their unique structural characteristics. In this paper, iron phosphates are classified based on their common characteristics such as structure, morphology and size, and their application in the past two decades is reviewed, with emphasis on their application in adsorption, separation and concentration of different species. Further, their application in adsorption, separation and concentration of heavy metals is prospected.

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41

Devesa-Rey, Rosa, Jesús del Val, Jorge Feijoo, José P. González-Coma, Gonzalo Castiñeira, and Lorena González-Gil. "Preparation of Synthetic Clays to Remove Phosphates and Ibuprofen in Water." Water 13, no. 17 (August 30, 2021): 2394. http://dx.doi.org/10.3390/w13172394.

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The main objective of this study consists in the synthesis of a layered double hydroxide (LDH) clay doped with magnesium and aluminum in order to test the removal of phosphates and ibuprofen in water. Two different LDH composites are assessed: oven-dried (LDHD) and calcined (LDHC). Single adsorptions of phosphate and ibuprofen showed up to 70% and 58% removal in water, when LDHC was used. A poorer performance was observed for LDHD, which presented adsorption efficiencies of 52% and 35%, respectively. The simultaneous removal of phosphate and ibuprofen in water showed that LDHC allows a greater reduction in the concentration of both compounds than LDHD. Phosphate adsorption showed a close agreement between the experimental and theoretical capacities predicted by the pseudo-second-order model, whereas ibuprofen fitted to a first-order model. In addition, phosphate adsorption showed a good fit to an intraparticle diffusion model and to Bangham model suggesting that diffusion into pores controls the adsorption process. No other mechanisms may be involved in ibuprofen adsorption, apart from intraparticle diffusion. Finally, phosphate desorption could recover up to 59% of the initial concentration, showing the feasibility of the recuperation of this compound in the LDH.

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42

Rivas, Manuel, Jordi Casanovas, Luis J. del Valle, Oscar Bertran, Guillermo Revilla-López, Pau Turon, Jordi Puiggalí, and Carlos Alemán. "An experimental-computer modeling study of inorganic phosphates surface adsorption on hydroxyapatite particles." Dalton Transactions 44, no. 21 (2015): 9980–91. http://dx.doi.org/10.1039/c5dt00209e.

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43

Ren, Yi Bin, and Nan Qi Ren. "Effect of Freeze-Thaw Action on Phosphorus Adsorption and Desorption in Forest Wetland Soils at High Latitudes." Applied Mechanics and Materials 316-317 (April 2013): 487–92. http://dx.doi.org/10.4028/www.scientific.net/amm.316-317.487.

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To clear the effect of freezing and thawing on the soil phosphorus adsorption and desorption of northeast China high latitude forest wetland, the change of soil phosphorus elements after five complete freeze-thaw cycles was analyzed with Wuyiling National Wetland as experimental subjects. Result shows that the soil phosphates desorption increased after influenced by five complete freezing and thawing. Soil sample which initial phosphates concentration is 40、80、240 mg/L reached minimum value after three freeze-thaw cycle and then increased. Compared to the without freeze-thaw soil, phosphorus adsorption capacity of different initial concentrations of phosphate solution samples was increased after five freeze-thaw cycles indicating that freeze-thaw cycle has obvious effect on soil phosphorus adsorption and desorption.

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44

Chen, Maosheng, Shuyan Liu, Wenwei Wu, Fengle Yang, Jianzhong Chen, and Bo Pan. "Adsorption and Release of Phosphates in the Case of Dianchi Sediments." JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 43, no. 10 (2010): 913–20. http://dx.doi.org/10.1252/jcej.10we119.

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45

Guo, Lei, Junshen Liu, Guoxiu Xing, and Quanwu Wen. "Adsorption and desorption of zinc(II) on water-insoluble starch phosphates." Journal of Applied Polymer Science 111, no. 2 (January 15, 2009): 1110–14. http://dx.doi.org/10.1002/app.29145.

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46

Siwek, Hanna, Artur Bartkowiak, and Małgorzata Włodarczyk. "Adsorption of Phosphates from Aqueous Solutions on Alginate/Goethite Hydrogel Composite." Water 11, no. 4 (March 27, 2019): 633. http://dx.doi.org/10.3390/w11040633.

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The basic process to reduce the phosphate ions in aquatic environments is to move the phosphorus circulation processes on the water–sediment phase boundary towards depositing it in the solid phase through chemical precipitation or adsorption. Modern technologies for removal of phosphorus can be based on cheap and environmentally friendly natural polysaccharides modified with multivalent metals. In this study alginate/goethite hydrogel composite has been investigated for phosphate uptake from aqueous solutions. The composite was produced by a cross-linking reaction between sodium alginate and calcium chloride in six configurations of suspensions, which differed in goethite content. In all cases, spherical and durable capsules of alginate/goethite composite were produced. In laboratory tests, mechanical stability of the capsules at various temperatures and the coexisting ions of lake water were tested. Chemical composition of the aquatic environment had a strong influence on their mechanical stability. Static batch adsorption of phosphate studies were carried out for two adsorbents: goethite and alginate/goethite composite. The goethite gelation resulted in almost double growth of sorption capacity in the case of adsorption from deionized water and, on average, a 50% growth in adsorption from the environmental water compared to raw goethite. The alginate/goethite adsorbent removed phosphate in a wide pH spectrum—from 4 to 10. Results suggest that the proposed adsorbent has potential for the removal of phosphate from contaminated water.

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47

El Boujaady, H., A. El Rhilassi, M. Bennani-Ziatni, R. El Hamri, A. Taitai, and J. L. Lacout. "Removal of a textile dye by adsorption on synthetic calcium phosphates." Desalination 275, no. 1-3 (July 2011): 10–16. http://dx.doi.org/10.1016/j.desal.2011.03.036.

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48

Guo, Lei, Chang-mei Sun, Gui-ying Li, Chun-ping Liu, and Chun-nuan Ji. "Thermodynamics and kinetics of Zn(II) adsorption on crosslinked starch phosphates." Journal of Hazardous Materials 161, no. 1 (January 2009): 510–15. http://dx.doi.org/10.1016/j.jhazmat.2008.04.003.

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49

Smith, Gregory N., Isabelle Grillo, Sarah E. Rogers, and Julian Eastoe. "Surfactants with colloids: Adsorption or absorption?" Journal of Colloid and Interface Science 449 (July 2015): 205–14. http://dx.doi.org/10.1016/j.jcis.2014.12.048.

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50

Tvardovskii, A. V. "General approach to adsorption and absorption." Bulletin of the Academy of Sciences of the USSR Division of Chemical Science 40, no. 7 (July 1991): 1307–11. http://dx.doi.org/10.1007/bf00961220.

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