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Structural investigation and applications of glassy sodium phosphate including the kinetics of dissolution rates and spectral analysis of the prepared samples with a focus on their effects on water treatment

Optical and Quantum Electronics volume 51, Article number: 102 (2019) Cite this article

Abstract

This paper discuss the preparation of the binary system of Phosphate Based Glass (PBG) xP2O5–(100 − x) Na2O mol% and investigates the compositions that form glassy matrix. It is found that x in the range between x = 40–60 mol% and divided in to 5 glass samples (x = 40, 45, 50, 55, 60) and for compositions of 40 > x > 60 no glassy matrix is formed. The intensities of the peak centers of the IR spectra of sodium phosphate glasses and the suggested vibrational modes of structural phosphate chains, terminal groups and tabulated data imply a shift in absorption bands with increasing the Na2O mol% content. The amount of bridging phosphorous, shows a maximum value for the glass containing 60 mol% Na2O due to the depolymerization of the phosphate matrix with increasing Na2O content from 40 to 60 mol% via a breakdown of some terminal bonds (P=O) in the glass network which decreases the bond strength, consequently the peak center is shifted towards lower wave number. Essentially, five compositions of glassy samples were investigated: (x = 40, 45, 50, 55, and 60) mol%. The kinetics of dissolution rate were investigated by two ways: 1—the weight loss data and 2—electrical properties of the solution (pH, Electrical Conductivity) leached by the glass sample in to the deionized water. It is found that with increasing the Na2O% content, the pH values, the dissolution rate and the solubility are increasing. It could be noticed that the ionic levels increased with the immersion time and were directly related to the solubility of the glasses. The highest in solubility (x = 40) is the highest in EC and pH values caused by high Na2O%. By studying the effect of PBG on the real water medium physical characteristics the following results were achieved: Softening of (Treated drinking water, Nile raw water) by removal of hardness (Ca, Mg) by x = 50; 50% P2O5–50% Na2O, Sequestering and agglomerating of (groundwater, wastewater) of some heavy metals as (Fe, Mn) up to 100% removal by x = 60; 60% P2O5–40% Na2O and the electrical properties (pH, EC) were discussed. Results are assuring the possibility of applying PBG for groundwater treatment of high Fe and Mn content. The data show that municipal groundwater supplies become acceptable according to the guidelines of American Chemistry Council for safe drinking water by using of polyphosphates for water treatment.

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Acknowledgements

The authors acknowledge the support of the Reference Laboratory for Drinking Water-The Holding Company for Water and Waste Water (HCWW) and Qalyubia Company for Water and Waste Water (QLBWW).

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Authors and Affiliations

  1. Holding Company for Water and Waste Water (HCWW), Cairo, Egypt

    Esmat M. Elfeky & Mohammad H. Barakat

  2. Egypt Nanotechnology Center (EGNC), Cairo University, Giza, Egypt

    Yahia H. Elbashar

  3. Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt

    Mohamed R. Shehata & Safaa S. Hassan

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  1. Esmat M. Elfeky
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  2. Yahia H. Elbashar
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  3. Mohammad H. Barakat
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  4. Mohamed R. Shehata
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  5. Safaa S. Hassan
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Correspondence to Yahia H. Elbashar.

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Elfeky, E.M., Elbashar, Y.H., Barakat, M.H. et al. Structural investigation and applications of glassy sodium phosphate including the kinetics of dissolution rates and spectral analysis of the prepared samples with a focus on their effects on water treatment. Opt Quant Electron 51, 102 (2019). https://doi.org/10.1007/s11082-019-1822-z

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  • DOI: https://doi.org/10.1007/s11082-019-1822-z

Keywords

  • Phosphate Based Glass (PBG)
  • Band deconvolution of IR spectra
  • Dissolution rate
  • Water medium