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Calcium-phosphorus interactions at a nano-structured silicate surface.

Daniel C Southam1, Trevor W Lewis, Andrew J McFarlane

  • 1School of Chemistry, University of Tasmania, Locked Bag 1371, Launceston 7250, Tasmania, Australia. d.southam@curtin.edu.au

Journal of Colloid and Interface Science
|January 11, 2008
PubMed
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Nano-structured calcium silicate (NCS) effectively removes orthophosphate from water, forming brushite. This process involves a pH-dependent two-step mechanism, making NCS a promising material for water treatment applications.

Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Nano-structured calcium silicate (NCS) is a porous material.
  • NCS is synthesized via controlled precipitation.
  • NCS is explored as a filler in paper manufacturing.

Purpose of the Study:

  • To investigate the chemisorption of orthophosphate by NCS.
  • To characterize the products of orthophosphate chemisorption.
  • To elucidate the mechanism of phosphate removal by NCS.

Main Methods:

  • Chemisorption experiments in aqueous solutions.
  • Microanalysis of chemisorption products.
  • X-ray diffraction (XRD) analysis.

Main Results:

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  • NCS exhibits high selectivity for orthophosphate removal.
  • Chemisorption alters NCS morphology to fibrous and crystalline structures.
  • Brushite (CaHPO4·2H2O) and calcium phosphates are identified as products.
  • A two-step, pH-dependent chemisorption mechanism is proposed.

Conclusions:

  • NCS effectively removes orthophosphate through chemisorption.
  • The mechanism involves initial hydroxide desorption and subsequent phosphate binding.
  • Brushite formation is a key outcome of the process.
  • NCS shows potential for environmental remediation applications.