Ambient Pressure and Temperature Synthesis of New Layered Magnesium Phosphate: MgHPO4 · 0.78H2O

Bensalem, A.; Iyer, Ganesh

doi:10.1006/jssc.1995.1092

Cited by 19 publications

(6 citation statements)

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“…The phase purity of the sample was found to be 87%, and the density is 1,701 kg/m 3 . The space group analysis of the sample assessed as orthorhombic (a = 6.9950 Å, b = 6.1420 Å, and c = 11.2180 Å) is in good agreement with the findings [42][43][44]. SEM-EDS analyzes the morphology of 9.5 μm crystals obtained from different trials were assessed and the pictures are shown in Fig.…”

Section: Struvite Purity and Crystal Sizesupporting

confidence: 81%

Optimization studies on the production of struvite from human urine – waste into value

Sathiasivan¹,

Ramaswamy²,

Rajesh³

2019

Desalination and Water Treatment

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a b s t r a c tRecovery of nutrients from wastewater streams has twin advantages of preventing eutrophication and providing value for the treatment process. Phosphate in significant quantities is available in sewage, with human urine accounting for a major portion. In this context, studies were conducted for the maximum recovery of phosphate as 'Struvite'. The significant variables that affect the struvite recovery from human urine were identified by Plackett Burman design and further optimized using a four factor central composite design. The optimal conditions for phosphate recovery were determined: pH 9.5, Mg to P ratio 1.5, precipitation time 40 min and ammonium concentration 2,000 mg L -1 . The maximum phosphate recovery obtained at optimal condition from synthetic urine sample was significantly higher than the real urine samples. The fertilizing ability of struvite so produced was assessed in comparison with normally used fertilizer 'Di-Ammonium Phosphate (DAP)' under identical conditions using Ixora coccinea L, a popular plant with medicinal values. The growth parameters of Ixora coccinea L were found to be significant for Struvite but could not match the performance of DAP. The twin advantages of lower cost of production particularly with the increasing demand for phosphorus and the utilization of environmentally benign waste product makes study relevant and attractive.

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Section: Struvite Purity and Crystal Sizesupporting

confidence: 81%

Optimization studies on the production of struvite from human urine – waste into value

Sathiasivan¹,

Ramaswamy²,

Rajesh³

2019

Desalination and Water Treatment

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“…Altering the synthetic conditions can lead to different structures as shown in molybdenum phosphates (9). Various magnesium phosphates have been structurally studies in detail (10)(11)(12)(13), however, with a few recent exceptions, they remain largely unexplored for catalytic purposes. The growing interest in catalytic uses for magnesium phosphate in highly relevant processes led us to undertake a comprehensive study on their synthesis and characterization.…”

Section: Introductionmentioning

confidence: 99%

Study on Synthesis of Magnesium Phosphate Materials

Mousa¹

2010

Phosphorus Research Bulletin

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During preparation, the synthesis of magnesium pyrophosphate or orthophosphate is strongly affected by the nature of both starting materials and precipitating agents. Also the stoichiometry of reactants influences on the structure and composition of prepared samples. Several magnesium phosphate samples were prepared at room temperature as Mg3(PO4)2.22H2O, MgHPO4.3H2O NH4MgPO4.H2O and NH4MgPO4.6H2O. After calcinations of these samples at 850°C for 6h, MgHPO4.3H2O, NH4MgPO4.H2O and NH4MgPO4.6H2O were converted to pyrophosphates (α-Mg2P2O7). But Mg3(PO4)2.22H2O converted to orthophosphate. The obtained solids were investigated as synthesized or after calcinations by various physicochemical techniques as X-ray diffraction (XRD), thermogravemetric analysis (TGA) and differential thermal analysis (DTA). IR spectroscopy was used for only calcined samples.

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“…It is known that the MgHPO 4 is slightly soluble in water and often used for production of less hygroscopic fertilizer (Karmyshov et al 1974). Thus the amount of hydrated MgHPO 4 (commonly tri-hydrated) (Bensalem and Iyer 1995) would be limited compared to MgSO 4 (commonly hepta-hydrated) in saline, and this would modify the hygroscopic property of gel-like saline constituent in the presence of phosphate buffer salt.…”

Section: Humidity Effectmentioning

confidence: 99%

Formation of Active Chlorine Oxidants in Saline-Oxone Aerosol

Jang

Mui

et al. 2010

Aerosol Science and Technology

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The application of oxidative reactions of Oxone R [2KHSO 5 KHSO 4 K 2 SO 4 ] as an active decontaminant has been mainly utilized through the aqueous solution. However, little is known about reactivity of aerosolized Oxone particles although the use of appropriate aerosolized oxidants would have significant value in remediating contaminated surfaces. In this study, the feasibility of producing active chlorine species from saline-Oxone aerosols was studied using a 2-m 3 Teflon film chamber. To evaluate the oxidative capability of a saline-Oxone aerosol, the aerosol was collected onto filters impregnated with a dye (e.g., metanil yellow) that reacts with active chlorine in the aerosol, and monitored by UV-Visible spectroscopy. Spectral data showed that the dye compound was 86% oxidized by active chlorine within 4 min. There was no significant difference in oxidation capability between with buffer and without buffer system, although the presence of phosphate buffer somewhat retarded the formation rate of active chlorine in salineOxone aerosol particles. Saline-Oxone aerosols were found to be highly acidic as determined by UV-Vis spectroscopy, indicating that the aerosol produced mostly an undissociated form of active chlorine species (e.g., HOCl and Cl 2 ) that was susceptible to partitioning into the gas phase. Our study concludes that the aerosolized saline-Oxone is a feasible chlorine oxidant, but the efficiency of such an approach still needs investigation.

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Ambient Pressure and Temperature Synthesis of New Layered Magnesium Phosphate: MgHPO4 · 0.78H2O

Cited by 19 publications

References 0 publications

Optimization studies on the production of struvite from human urine – waste into value

Optimization studies on the production of struvite from human urine – waste into value

Study on Synthesis of Magnesium Phosphate Materials

Formation of Active Chlorine Oxidants in Saline-Oxone Aerosol

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