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Journal articles on the topic 'Phosphate precipitation'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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1

Labgairi, K., A. Borji, M. Kaddami, and A. Jourani. "Kinetic Study of Calcium Phosphate Precipitation in the System H3PO4-Ca(OH)2-H2O at 30°C." International Journal of Chemical Engineering 2020 (November 10, 2020): 1–9. http://dx.doi.org/10.1155/2020/2893298.

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The precipitation kinetics of calcium phosphates, namely, hydroxyapatite (HAP), dicalcium phosphate dihydrate (DCPD), dicalcium phosphate anhydrous (DCPA), and monocalcium phosphate monohydrate (MCPM), were studied at 30°C by mixing calcium hydroxide, water, and phosphoric acid. The studied mixture was selected according to the stability domain of different calcium phosphates by referring to the phase diagram of the ternary system of H3PO4-Ca(OH)2-H2O at 30°C. The precipitation reaction has been monitored by following the changes in the conductivity, pH, and calcium concentration. The solid ph

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2

Valsami-Jones, E. "Mineralogical controls on phosphorus recovery from wastewaters." Mineralogical Magazine 65, no. 5 (2001): 611–20. http://dx.doi.org/10.1180/002646101317018433.

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AbstractThe removal of phosphorus from wastewaters is becoming very common, to meet water quality targets, and avoid environmental problems related to eutrophication. At the same time, agricultural application of P-rich sewage biosolids is diminishing for reasons of logistics and of public pressure. As a result P from wastewaters is ultimately disposed of in landfills. Over the long term, phosphate ore reserves will become depleted. Recycling of P from wastewaters may thus be a realistic prospect if scientific and technical issues can be resolved. At the centre of the scientific problems lie c

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3

Wysocka, Izabela. "Wastewater parameters after the process of phosphorus compounds removal by the metal dissolution method in comparison with precipitation and electrocoagulation methods." Ochrona Srodowiska i Zasobów Naturalnych 28, no. 1 (2017): 8–13. http://dx.doi.org/10.1515/oszn-2017-0001.

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Abstract Precipitation methods are commonly used for removing phosphorus compounds from wastewater. Chemical precipitation method, based on adding iron, aluminium or calcium salts to the treated wastewater, is often used. Another possible way of precipitating phosphates is metal dissolution method, which is presented in this paper. The main difference between these two methods is how the phosphate precipitating ions are introduced to the wastewater. This paper discusses advantages and disadvantages of the metal dissolution method in comparison with traditional precipitation methods. Difference

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4

Sokolova, Marina, Andris Putnins, Imants Kreicbergs, and Janis Locs. "Scale-Up of Wet Precipitation Calcium Phosphate Synthesis." Key Engineering Materials 604 (March 2014): 216–19. http://dx.doi.org/10.4028/www.scientific.net/kem.604.216.

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Within current research calcium phosphates were synthesized by wet chemical precipitation method in laboratory and pilot scale reactor. The aim of this work was to study the influence of main technological parameters of wet chemical precipitation synthesis and scale-up of laboratory synthesis. The results showed that it is possible to obtain calcium phosphates with different and reproducible phase compositions such as hydroxyapatite (HAp), β-tricalcium phosphate (β-TCP) and biphasic calcium phosphates (HAp/β-TCP) in pilot scale reactor. Using the method developed it was possible to increase th

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Wang, Yu Qi, Qi Zhang, Luo Feng Liu, Bi Jun Luo, Dan Wu, and Ping Huang Xi. "Study on Removing Ammonium Nitrogen from Wastewater Using Magnesium Hydroxide." Advanced Materials Research 955-959 (June 2014): 2550–53. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2550.

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Magnesium ammonium phosphate (MAP) precipitation has been studied by using magnesium hydroxide and sodium dihydrogen phosphate as precipitators for treating simulation wastewater in which the concentration of ammonia nitrogen is 10.00g/L. The effect of reaction time, pH and precipitator ratio on ammonium nitrogen removal rate has been investigated. The obtained optimum treatment conditions of MAP precipitation for treating ammonia nitrogen wastewater are as follows: reaction time is 4 hours, pH is 8.0, the molar ratio of sodium dihydrogen phosphate and ammonia nitrogen in wastewater, i.e. n (P

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Başakçılardan-Kabakcı, Sibel, A. Nursen İpekoğlu, and İlhan Talınlı. "Precipitation of Urinary Phosphate." Environmental Engineering Science 24, no. 10 (2007): 1399–408. http://dx.doi.org/10.1089/ees.2006.0136.

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7

Oliveira, C., A. Ferreira, and F. Rocha. "Dicalcium Phosphate Dihydrate Precipitation." Chemical Engineering Research and Design 85, no. 12 (2007): 1655–61. http://dx.doi.org/10.1016/s0263-8762(07)73209-4.

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8

Kamitakahara, Masanobu, Shinichi Ogata, Masao Tanihara, and Chikara Ohtsuki. "Control of Calcium Phosphate Precipitation in Hydrogel." Key Engineering Materials 330-332 (February 2007): 79–82. http://dx.doi.org/10.4028/www.scientific.net/kem.330-332.79.

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Electrophoresis can transport ions more rapidly and directionally in a gel. The controlled precipitation of calcium phosphates in an agarose gel was attempted by electrophoresis of calcium and phosphate ions. Wells were prepared on an agarose gel. A CaCl2 solution was placed in wells on the positive side and a Na2HPO4 solution in wells on the negative side. A potential of 100 V was then applied. White precipitates appeared in the gel after 11 min. The white area initially became larger and more intense with increasing time. However, after longer periods, the white area decreased and became wea

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9

Luedecke, Cornelia, Slawomir W. Hermanowicz, and David Jenkins. "Precipitation of Ferric Phosphate in Activated Sludge: A Chemical Model and Its Verification." Water Science and Technology 21, no. 4-5 (1989): 325–37. http://dx.doi.org/10.2166/wst.1989.0235.

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A chemical model of ferric phosphate precipitation was developed describing ferric hydroxy-phosphate precipitation either alone or together with ferric hydroxide. Conditions for formation of one or two precipitates are examined. The model also incorporates an additional mechanism for phosphate removal through adsorption of PO43− ions on the precipitate. Experimental verification of the proposed model was carried out in lab-scale batch and continuous activated sludge units fed with municipal primary effluent and at five pH values in the range of 6.5 to 8.0. Solubility of ferric phosphate in the

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10

Suci Perwitasari, Dyah, Nur Aini Fauziyah, and Pardi Sampe Tola. "Synthesis of Struvite Crystal (MgNH4PO4.6H2O) from Laundry Waste to Consider its Potential as a Plant Fertilizer: Stirring and Processing Temperature Effect." Journal of Pure and Applied Chemistry Research 11, no. 3 (2022): 200–206. http://dx.doi.org/10.21776/ub.jpacr.2022.011.03.697.

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This paper aimed to process phosphate from laundry waste to be struvite crystal by precipitation and crystallization methods. In general, phosphates are difficult to remove by conventional treatment technologies. Therefore, precipitation and crystallization methods can be an alternative choice for phosphate recovery. Precipitation and crystallization methods by adding KOH can serve to remove dissolved phosphate content in wastewater, as well as convert it into a solid form that can be reused as industrial raw materials. The research variables used were stirring temperature (25, 30, and 35 C)

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11

Salma, Kristine, Liga Berzina-Cimdina, and Natalija Borodajenko. "Calcium phosphate bioceramics prepared from wet chemically precipitated powders." Processing and Application of Ceramics 4, no. 1 (2010): 45–51. http://dx.doi.org/10.2298/pac1001045s.

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In this work calcium phosphates were synthesized by modified wet chemical precipitation route. Contrary to the conventional chemical precipitation route calcium hydroxide was homogenized with planetary mill. Milling calcium oxide and water in planetary ball mill as a first step of synthesis provides a highly dispersed calcium hydroxide suspension. The aim of this work was to study the influence of main processing parameters of wet chemical precipitation synthesis product and to control the morphology, phase and functional group composition and, consequently, thermal stability and microstructur

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12

Karapinar, Nuray, Erhard Hoffmann, and Hermann H. Hahn. "Magnetite seeded precipitation of phosphate." Water Research 38, no. 13 (2004): 3059–66. http://dx.doi.org/10.1016/j.watres.2004.04.042.

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13

Anggoro, Achmad Rahditya Viman, Rahma Dea Rerindra Arianti, Caecilia Pujiastuti, Ketut Sumada, and Srie Muljani. "Synthesis and Characterization of Calcium Phosphate Using Two Stages of Process." Jurnal Rekayasa Kimia & Lingkungan 19, no. 1 (2024): 72–80. http://dx.doi.org/10.23955/rkl.v19i1.37829.

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Calcium phosphate, a naturally occurring biomaterial found in human and animal bones and teeth, possesses desirable properties such as strength, biocompatibility, and the ability to stimulate tissue growth. This study investigates the synthesis of calcium phosphate through a precipitation method without calcination. The process involves dissolving raw materials in phosphoric acid, followed by precipitation using KOH as the precipitating agent. The resulting precipitate was then calcined for 3 hours. The calcium phosphate product was characterized using XRF, XRD, and SEM-EDX techniques. The res

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14

Grünebaum, T., and E. Dorgeloh. "Biological Phosphorus Elimination Combined with Precipitation and Flocculation." Water Science and Technology 25, no. 4-5 (1992): 219–24. http://dx.doi.org/10.2166/wst.1992.0498.

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As interactions between chemical precipitation and biological wastewater treatment are well known, biological phosphate removal should be considered for advanced nutrient removal. A combination of biological phosphate removal and chemical precipitation treatment is sensible and economic, when the precipitation step is used for removal of residual amounts of phosphate. Improved biological phosphate removal and simultaneous precipitation both give increase in dry solids phosphate content. Assuming a concentration of 0.05 gP/gSS and an effluent suspended solids concentration of 20 mg/l the solids

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15

Inkret, Suzana, Marija Ćurlin, Kristina Smokrović, et al. "Can Differently Stabilized Silver Nanoparticles Modify Calcium Phosphate Precipitation?" Materials 16, no. 5 (2023): 1764. http://dx.doi.org/10.3390/ma16051764.

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Calcium phosphates (CaPs) composites with silver nanoparticles (AgNPs) attract attention as a possible alternative to conventional approaches to combating orthopedic implant-associated infections. Although precipitation of calcium phosphates at room temperatures was pointed out as an advantageous method for the preparation of various CaP-based biomaterials, to the best of our knowledge, no such study exists for the preparation of CaPs/AgNP composites. Motivated by this lack of data in this study we investigated the influence of AgNPs stabilized with citrate (cit-AgNPs), poly(vinylpyrrolidone)

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16

Shaddel, Sina, Seniz Ucar, Jens-Petter Andreassen, and Stein W. Østerhus. "Enhancing efficiency and economics of phosphorus recovery process by customizing the product based on sidestream characteristics – an alternative phosphorus recovery strategy." Water Science and Technology 79, no. 9 (2019): 1777–89. http://dx.doi.org/10.2166/wst.2019.178.

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Abstract The enhanced biological phosphorus removal process makes the phosphorus recovery feasible from the dewatering streams of biological sludge. The physicochemical properties of these sidestreams, as an input to a crystallizer, are different before and after anaerobic digestion. In this study, phosphorus recovery by calcium phosphate is proposed for pre-digestion sidestreams and by struvite precipitation for post-digestion sidestreams. The thermodynamic modeling followed by experimental tests was performed to evaluate the recovery efficiency and product properties of struvite and calcium

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17

Ro, H. M., and C. M. Cho. "Diffusive phosphate transport in Al-rich acidic porous cation exchange system." Canadian Journal of Soil Science 80, no. 4 (2000): 551–60. http://dx.doi.org/10.4141/s99-113.

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One-dimensional diffusive phosphate transport in a porous cation-exchange resin model system was investigated to examine the effect of exchangeable Al on the movement of phosphate. This study presumes that Al interacts with phosphate and H+ is produced as a result of deprotonation of H2PO4−. The production of H+ due to interactions between positively charged Al ions and phosphate ions was confirmed by measuring the pH change during the titration of phosphate by aluminum or aluminum by phosphate ions. A set of cylindrical wax columns packed with: (A) a mixture of sand and solid Al2O3, (B) a mix

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18

Lazar, Dolores Ribeiro Ricci, Sandra Maria Cunha, Valter Ussui, E. Fancio, Nelson Batista de Lima, and Ana Helena A. Bressiani. "Effect of Calcination Conditions on Phase Formation of Calcium Phosphates Ceramics Synthesized by Homogeneous Precipitation." Materials Science Forum 530-531 (November 2006): 612–17. http://dx.doi.org/10.4028/www.scientific.net/msf.530-531.612.

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Phase composition of calcium phosphate ceramics is a characteristic directly related to the biological response of implants due to the differences in mechanical and biochemical properties of these compounds. In this sense, it was evaluated in this work the crystalline phase evolution of calcium phosphates samples synthesized by wet precipitation route. Fixing Ca/P atomic ratio as 1.67, precipitation was carried out from heated aqueous solutions of calcium chloride and ammonium hydrogen phosphate, in ammonium medium (pH = 10). After washing and drying steps, calcination was performed at 600 to

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19

Lima, Daniel O. de, Marcelo Henrique Prado da Silva, Jose B. de Campos, Antonella M. Rossi, and Marisa Masumi Beppu. "Influence of Alginate on Precipitation of Calcium Phosphates." Key Engineering Materials 309-311 (May 2006): 195–98. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.195.

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Calcium phosphates are widely used in medicine and dentistry. However, synthesis of these substances through precipitation methods still presents problems regarding reproducibility. Alginate is a polymer extracted from brown algae, whose monomers are D-mannuronic and L-guluronic acids, and is suitable for biomedical applications. The aim of this paper is to investigate how the poly-ionic nature of alginate affects phase composition of calcium phosphate obtained through a precipitation method.

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20

Elghniji, Kais, Mohamed Saad, Manel Araissi, Elimame Elaloui, and Younes Moussaoui. "Chemical modification of TiO2 by H2PO4−/HPO42− anions using the sol-gel route with controlled precipitation and hydrolysis: enhancing thermal stability." Materials Science-Poland 32, no. 4 (2014): 617–25. http://dx.doi.org/10.2478/s13536-014-0237-6.

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AbstractTwo titanium phosphate materials (TpP and ThP) have been successfully synthesized by sol-gel route with controlled precipitation and hydrolysis. The TpP material was obtained from the reaction between precipitated titania and phosphate buffer solution H2PO4− /HPO42− (pH = 7.3). The TpP material was prepared through hydrolysis of titanium in the presence of H2PO4−/HPO42. The probable state of the phosphate anions in titania framework and their effect on the anatase-to-rutile transformation were characterized by ICP-AES, DTA-TG, 31P NMR, FT-IR, and Raman analysis HRTEM/SEM. FT-IR and 31P

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21

Mekmene, Omar, Thierry Rouillon, Sophie Quillard, et al. "Effects of citrate and NaCl on size, morphology, crystallinity and microstructure of calcium phosphates obtained from aqueous solutions at acidic or near-neutral pH." Journal of Dairy Research 79, no. 2 (2012): 238–48. http://dx.doi.org/10.1017/s0022029912000076.

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Precipitation of calcium phosphates occurs in dairy products and depending on pH and ionic environment, several salts with different crystallinity can form. The present study aimed to investigate the effects of NaCl and citrate on the characteristics of precipitates obtained from model solutions of calcium phosphate at pH 6·70 maintained constant or left to drift. The ion speciation calculations showed that all the starting solutions were supersaturated with respect to dicalcium phosphate dihydrate (DCPD), octacalcium phosphate (OCP) and hydroxyapatite (HAP) in the order HAP>OCP>DCPD. X-

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22

Desmidt, E., W. Verstraete, J. Dick, B. D. Meesschaert, and M. Carballa. "Ureolytic phosphate precipitation from anaerobic effluents." Water Science and Technology 59, no. 10 (2009): 1983–88. http://dx.doi.org/10.2166/wst.2009.193.

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In this work, the elimination of phosphate from industrial anaerobic effluents was evaluated at lab-scale. For that purpose, the ureolytic method previously developed for the precipitation of Ca2 + from wastewater as calcite was adapted for the precipitation of phosphate as struvite. In the first part of the study, computer simulations using MAPLE and PHREEQC were performed to model phosphate precipitation from wastewater as struvite. The results obtained showed that relative high concentrations of ammonium and magnesium are needed to precipitate phosphate as struvite. The total molar concentr

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23

Tasomara, Riesma, Siti Julia, Yessie Widya Sari, Nurlely, and Djarwani Soeharso Soejoko. "Study of Carbonated Calcium Phosphate Precipitation on Collagen." Materials Science Forum 966 (August 2019): 126–32. http://dx.doi.org/10.4028/www.scientific.net/msf.966.126.

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Calcium phosphate biocomposites are candidate materials for bone tissue engineering due to their conductivity and biocompatibility. Calcium phosphate could be grown on collagen by precipitation method in long reaction time. Microwave irradiation is rapid method to assist precipitation by reducing reaction time. In order to study carbonated calcium phosphate precipitation on collagen and investigate the influence of microwave irradiation time, the carbonated calcium phosphate has been grown on collagen by microwave assisted precipitation method. The collagen sheets were soaked in carbonated cal

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24

Glazov, I. E., V. K. Krut’ko, R. A. Vlasov, O. N. Musskaya, and A. I. Kulak. "Nanocomposites based on apatitic tricalcium phosphate and autofibrin." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 57, no. 4 (2021): 413–23. http://dx.doi.org/10.29235/1561-8331-2021-57-4-413-423.

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Nanocomposites based on apatitic tricalcium phosphate in an autofibrin matrix were obtained by precipitation at a Ca/P ratio of 1.50, pH 9 and a maturation time from 30 min to 7–14 days. The resorbability of nanocomposites was determined by the composition of calcium phosphates, which, during long-term maturation, formed as the calcium-deficient hydroxyapatite with a Ca/P ratio of 1.66, whereas biopolymer matrix favored the formation of more soluble calcium phosphates with a Ca/P ratio of 1.53–1.59. It was found that the fibrin clot stabilized, along with apatitic tricalcium phosphate, the pha

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Mesplé, F., M. Troussellier, C. Casellas, and J. Bontoux. "Difficulties in modelling phosphate evolution in a high-rate algal pond." Water Science and Technology 31, no. 12 (1995): 45–54. http://dx.doi.org/10.2166/wst.1995.0456.

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The High-Rate Algal Pond is an efficient treatment for controlling wastewater pollution by reducing the organic matter and the inorganic nutrient. The removal of phosphate is of great importance considering eutrophication. Deterministic modelling of the HRAP ecosystem could provide a rational basis for pond management. The aim of this paper is to underline the difficulties in modelling orthophosphate evolution in an HRAP. A model simulating the evolution of orthophosphate concentrations in an experimental HRAP was developed taking into account the usual processes: inflow, outflow, mineralizati

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KUWATA, Goro, Satoshi IWATSUKI, Sumiko TOYAMA, and Masatake IMAI. "Inhibitory Activity of Inositol Phosphates against the Precipitation of Calcium Phosphate." Nippon Eiyo Shokuryo Gakkaishi 46, no. 1 (1993): 83–88. http://dx.doi.org/10.4327/jsnfs.46.83.

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27

Rivadeneyra, María Angustias, Agustín Martín-Algarra, Antonio Sánchez-Navas, and Daniel Martín-Ramos. "Carbonate and Phosphate Precipitation byChromohalobacter marismortui." Geomicrobiology Journal 23, no. 1 (2006): 1–13. http://dx.doi.org/10.1080/01490450500398245.

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Rivadeneyra, María Angustias, Agustín Martín-Algarra, Antonio Sánchez-Navas, and Daniel Martíin-Ramos. "Carbonate and Phosphate Precipitation byChromohalobacter marismortui." Geomicrobiology Journal 23, no. 2 (2006): 89–101. http://dx.doi.org/10.1080/01490450500533882.

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29

Cichy, Barbara, and Ewa Kużdżał. "Kinetic Model of Melamine Phosphate Precipitation." Industrial & Engineering Chemistry Research 51, no. 51 (2012): 16531–36. http://dx.doi.org/10.1021/ie3020928.

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30

Pierri, E., D. Tsamouras, and E. Dalas. "Ferric phosphate precipitation in aqueous media." Journal of Crystal Growth 213, no. 1-2 (2000): 93–98. http://dx.doi.org/10.1016/s0022-0248(00)00336-5.

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31

Kibalczyc, Wiktor, and Anna Zielenkiewicz. "Calorimetric investigations of calcium phosphate precipitation." Journal of Crystal Growth 82, no. 4 (1987): 733–36. http://dx.doi.org/10.1016/s0022-0248(87)80019-2.

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Liu, J. C., Warmadewanthi, and Ching-Jung Chang. "Precipitation flotation of phosphate from water." Colloids and Surfaces A: Physicochemical and Engineering Aspects 347, no. 1-3 (2009): 215–19. http://dx.doi.org/10.1016/j.colsurfa.2009.04.036.

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Prélot, Bénédicte, and Thomas Zemb. "Calcium phosphate precipitation in catanionic templates." Materials Science and Engineering: C 25, no. 5-8 (2005): 553–59. http://dx.doi.org/10.1016/j.msec.2005.07.008.

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Conidi, Daniela, Wayne Parker, Dwight Houweling, Scott Smith, Peter Seto, and Sudhir Murthy. "Phosphate Uptake in Co-precipitation Systems Targeting Low Phosphate Concentrations." Proceedings of the Water Environment Federation 2011, no. 11 (2011): 4891–902. http://dx.doi.org/10.2175/193864711802765642.

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35

Martin, Ronald R., Roger St C. Smart, and Kazue Tazaki. "Direct Observation of Phosphate Precipitation in the Goethite/Phosphate System." Soil Science Society of America Journal 52, no. 5 (1988): 1492–500. http://dx.doi.org/10.2136/sssaj1988.03615995005200050054x.

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Faksawat, Kridsada, Supphadate Sujinnapram, Pichet Limsuwan, Ekachai Hoonnivathana, and Kittisakchai Naemchanthara. "Preparation and Characteristic of Hydroxyapatite Synthesized from Cuttlefish Bone by Precipitation Method." Advanced Materials Research 1125 (October 2015): 421–25. http://dx.doi.org/10.4028/www.scientific.net/amr.1125.421.

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Calcium phosphates ceramics such as a hydroxyapatite have composition and structure similar to be mineral component of bone. Hydroxyapatite could be production from natural and chemical source with various techniques. In this study, Calcium phosphates was prepared and characterized for future applications on the utilization of bioactivity and resorbability of Hydroxyapatite. Hydroxyapatite was synthesized by precipitation method using cuttlefish bone as the calcium (Ca) source in the form of calcium nitrate and ammonium phosphate as the phosphate (P) source. The property, crystal structure and

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Vecbiskena, Linda, Luigi de Nardo, and Roberto Chiesa. "Nanostructured Calcium Phosphates for Biomedical Applications." Key Engineering Materials 604 (March 2014): 212–15. http://dx.doi.org/10.4028/www.scientific.net/kem.604.212.

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This work is focused on the phase transformation from amorphous calcium phosphate (ACP) to nanostructured hydroxyapatite (HA) or tricalcium phosphate (TCP). Amorphous calcium phosphates with Ca/P molar ratio near 1.67 and 1.5 were synthesized by wet-chemical precipitation method and treated with ethanol. Upon thermal treatment, ACP clusters about 50 nm create a nanostructured HA or TCP. The highlights of this research: The precipitate treatment with ethanol provided a pure α-TCP that was found to be stable up to 1000 °C. HA is obtained from the ACP precursor synthesized using also ammonium dih

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Lee, S. M., B. J. Choi, and K. H. Kim. "Removal of phosphate by seafood processing wasted sludge." Water Science and Technology 46, no. 9 (2002): 297–302. http://dx.doi.org/10.2166/wst.2002.0263.

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There is a need for developing low cost, easily and abundantly available, yet efficient, adsorbents for the removal of phosphates during the tertiary treatment of wastewater. The wasted sludge from a cuttlefish processing factory prepared on a laboratory scale has been used to evaluate its performance for phosphate adsorption. The material has been shown to be a good alternative adsorbent. As much as 90% phosphate removal by the prepared sludge is possible in about 20 h under the test conditions. Phosphate removal is seen to increase with decreasing adsorbent particle size, increasing the rela

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Yang, Shengjiong, Pengkang Jin, Xiaochang C. Wang, Qionghua Zhang, and Xiaotian Chen. "Phosphorus removal from aqueous solution using a novel granular material developed from building waste." Water Science and Technology 75, no. 6 (2017): 1500–1511. http://dx.doi.org/10.2166/wst.2017.019.

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In this study, a granular material (GM) developed from building waste was used for phosphate removal from phosphorus-containing wastewater. Batch experiments were executed to investigate the phosphate removal capacity of this material. The mechanism of removal proved to be a chemical precipitation process. The characteristics of the material and resulting precipitates, the kinetics of the precipitation and Ca2+ liberation processes, and the effects of dosage and pH were investigated. The phosphate precipitation and Ca2+ liberation processes were both well described by a pseudo-second-order kin

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40

Mardziah, C. M., Mohamad Firdaus Abdul Wahid, Koay Mei Hyie, Nik Rozlin Nik Masdek, and Z. Salleh. "Effect of Sintering Temperature on Zinc Substituted Calcium Phosphate Ceramics." Materials Science Forum 890 (March 2017): 209–12. http://dx.doi.org/10.4028/www.scientific.net/msf.890.209.

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Calcium phosphate ceramics were substituted with several concentrations of zinc ions (0, 5, 10 and 15 mol%) using precipitation method. The effect of sintering temperature at 900 and 1000°C on zinc substituted calcium phosphate ceramics were observed. By increasing the sintering temperature, XRD peaks for zinc substituted calcium phosphate ceramics changed significantly. At sintering temperature of 900°C, hydroxyapatite phase was the major phase in the calcium phosphates containing 0 and 5 mol% zinc. However, at the sintering temperature of 1000°C, hydroxyapatite phase was partly transformed t

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Wang, Xiaoming, Brian Phillips, Jean-François Boily, et al. "Phosphate Sorption Speciation and Precipitation Mechanisms on Amorphous Aluminum Hydroxide." Soil Systems 3, no. 1 (2019): 20. http://dx.doi.org/10.3390/soilsystems3010020.

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Aluminum (Al) oxides are important adsorbents for phosphate in soils and sediments, and significantly limit Phosphate (P) mobility and bioavailability, but the speciation of surface-adsorbed phosphate on Al oxides remains poorly understood. Here, phosphate sorption speciation on amorphous Al hydroxide (AAH) was determined under pH 3–8 and P concentration of 0.03 mM–15 mM using various spectroscopic approaches, and phosphate precipitation mechanisms were discussed as well. AAH exhibits an extremely high phosphate sorption capacity, increasing from 3.80 mmol/g at pH 7 to 4.63 mmol/g at pH 3. Reg

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Pomar, Luis, Pamela Hallock, Guillem Mateu-Vicens, and Juan I. Baceta. "Why Do Bio-Carbonates Exist?" Journal of Marine Science and Engineering 10, no. 11 (2022): 1648. http://dx.doi.org/10.3390/jmse10111648.

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Calcium carbonate precipitation associated with biotic activity is first recorded in Archaean rocks. The oldest putative fossils related to hydrothermal vents have been dated at ~3.77 Ga (possibly 4.29 Ga). Stromatolites, the oldest dated at 3.70 Ga, have since occurred through Earth history, despite dramatic changes in physical and chemical conditions in aquatic environments. A key question is: what advantages do photosynthesizing aquatic prokaryotes and algae gain by precipitating carbonates? We propose the Phosphate Extraction Mechanism (PEM) to explain the benefits of biomineralization in

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Amjad, Zahid. "Effect of precipitation inhibitors on calcium phosphate scale formation." Canadian Journal of Chemistry 67, no. 5 (1989): 850–56. http://dx.doi.org/10.1139/v89-131.

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The highly reproducible pH-stat technique was used to study the influence of various types of inhibitors on the precipitation of calcium phosphate from solution. Three types of inhibitors were evaluated: (1) homo- and copolymers of acrylic acid, (2) polyphosphate and phosphonates, and (3) polycarboxylic acids. Experimental variables studied included pH, temperature, and inhibitor dosage all of which were found to greatly affect the precipitation of calcium phosphate. The role of polyacrylic acid molecular weight is addressed. Comparative data for the various types of inhibitors is discussed. K

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Jabgunde, Amit M., Alejandro Gimenez Molina, Pasi Virta, and Harri Lönnberg. "Preparation of a disulfide-linked precipitative soluble support for solution-phase synthesis of trimeric oligodeoxyribonucleotide 3´-(2-chlorophenylphosphate) building blocks." Beilstein Journal of Organic Chemistry 11 (September 7, 2015): 1553–60. http://dx.doi.org/10.3762/bjoc.11.171.

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The preparation of a disulfide-tethered precipitative soluble support and its use for solution-phase synthesis of trimeric oligodeoxyribonucleotide 3´-(2-chlorophenylphosphate) building blocks is described. To obtain the building blocks, N-acyl protected 2´-deoxy-5´-O-(4,4´-dimethoxytrityl)ribonucleosides were phosphorylated with bis(benzotriazol-1-yl) 2-chlorophenyl phosphate. The “outdated” phosphotriester strategy, based on coupling of PV building blocks in conjunction with quantitative precipitation of the oligodeoxyribonucleotide with MeOH is applied. Subsequent release of the resulting p

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Ingram, G. S., and W. M. Edgar. "Calcium Salt Precipitation and Mechanisms of Inhibition Under Oral Conditions." Advances in Dental Research 9, no. 4 (1995): 427–32. http://dx.doi.org/10.1177/08959374950090041301.

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Dental calculus contains a range of calcium phosphates, derived from plaque fluid and the saliva. Older deposits tend to contain more hydroxyapatite and 6 tricalcium phosphate. Compounds which inhibit the transformation of calcium phosphate nuclei to hydroxyapatite and its subsequent crystal growth are known to be effective in restricting calculus deposition in vivo. Such compounds include the diphosphonates, polyphosphates, and zinc. Under physiological conditions, apatites tend to be calcium-deficient with matching HP042- groups. If these groups are displaced, then crystal growth is inhibite

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Trobajo, Camino, Maria L. Rodríguez, Marta Suárez, et al. "Layered mixed tin-titanium phosphates." Journal of Materials Research 13, no. 3 (1998): 754–59. http://dx.doi.org/10.1557/jmr.1998.0095.

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Mixed crystalline tin-titanium phosphates with variable tin-to-titanium molar ratio have been prepared by precipitation of soluble salts of the metal (IV) with phosphoric acid and refluxing the amorphous solids in 17 M H3PO4. The new materials are characterized by chemical textural and thermal analysis and x-ray powder diffraction. The tin-titanium phosphates are solid solutions showing an isomorphic substitution of tin by titanium in the α-tin phosphate lattice and tin substitution in the γ-titanium phosphate lattice. In both cases, the solubility is partial. The coexistence of both saturated

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Barata, Paulo A., and Maria L. Serrano. "Salting-out precipitation of potassium dihydrogen phosphate (KDP). I. Precipitation mechanism." Journal of Crystal Growth 160, no. 3-4 (1996): 361–69. http://dx.doi.org/10.1016/0022-0248(95)00740-7.

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Bäck, Magnus, and Jean-Baptiste Michel. "From organic and inorganic phosphates to valvular and vascular calcifications." Cardiovascular Research 117, no. 9 (2021): 2016–29. http://dx.doi.org/10.1093/cvr/cvab038.

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Abstract Calcification of the arterial wall and valves is an important part of the pathophysiological process of peripheral and coronary atherosclerosis, aortic stenosis, ageing, diabetes, and chronic kidney disease. This review aims to better understand how extracellular phosphates and their ability to be retained as calcium phosphates on the extracellular matrix initiate the mineralization process of arteries and valves. In this context, the physiological process of bone mineralization remains a human model for pathological soft tissue mineralization. Soluble (ionized) calcium precipitation

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Pesonen, Janne, Pekka Myllymäki, Sari Tuomikoski, et al. "Use of Calcined Dolomite as Chemical Precipitant in the Simultaneous Removal of Ammonium and Phosphate from Synthetic Wastewater and from Agricultural Sludge." ChemEngineering 3, no. 2 (2019): 40. http://dx.doi.org/10.3390/chemengineering3020040.

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Phosphorus as phosphate and nitrogen as ammonium or nitrate are the main nutrients in wastewaters and agricultural sludges. They runoff easily to waterways and cause eutrophication in water bodies. However, ammonium and phosphate could be precipitated simultaneously and used as recycled nutrients. In this research, dolomite calcined at 650 °C, 750 °C, or 950 °C and commercial MgO were used as precipitants in simultaneous phosphate and ammonium removal from synthetic (NH4)2HPO4 solution and agricultural sludge. Calcination at 750 °C was the preferred option as dolomite was decomposed to MgO and

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O'Neal, Jeremy A., and Treavor H. Boyer. "Phosphorus recovery from urine and anaerobic digester filtrate: comparison of adsorption–precipitation with direct precipitation." Environmental Science: Water Research & Technology 1, no. 4 (2015): 481–92. http://dx.doi.org/10.1039/c5ew00009b.

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