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Home Υλικά με βάση μεταλλο-τετραφωσφονικούς σκελετούς : δομική ποκιλότητα και εφαρμογές στο σχηματισμό λεπτών υμενίων

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Identifier

000337284

Title

Υλικά με βάση μεταλλο-τετραφωσφονικούς σκελετούς : δομική ποκιλότητα και εφαρμογές στο σχηματισμό λεπτών υμενίων

Alternative Title

Metal-tetraphosphonate based materials : structure variance and formation of thin layers

Author

Μπαρούδα, Ελένη Ν

Thesis advisor

Δημάδης, Κωνσταντίνος

Abstract

Use of natural hard waters in industrial water systems (e.g. cooling, boiler, desalination, oil production etc.) can cause severe scaling and corrosion of equipment surfaces and pose serious technical and economic challenges. Additives commonly used in order to control scale deposit and corrosion include phosphonates. HDTMP, (H₂O₃PH₂C)₂N-(CH₂)₆-N(CH₂PO₃H₂)₂, and EDTMP, (H₂O₃PH₂C)₂N-(CH₂)₂-N(CH₂PO₃H₂)₂, are widely used phosphonates by industry for the treatment of industrial water. In the present work coordination polymers of HDTMP with metal ions Ba²⁺ , Sr²⁺ , Cu²⁺ , Ca²⁺ and EDTMP with Sr²⁺ , Ca²⁺ are synthesized and structurally characterized. Furthermore, the crystal structure of HDTMP with ethylenediamine and EDTMP with ammonia are described. Additionally, the anticorrosive ability of these compounds was investigated under pH~2 (where synthesis of the crystalline compounds took place) and pH=7, within the limits of that of industrial water systems. The results show an anticorrosive effect of HDTMP with Ba²⁺ , Sr²⁺ at pH=7 whereas EDTMP with Ca²⁺ , Sr²⁺ acts as an iron oxide dissolving agent. Finally, the ability of the 2D compound Ca-HDTMP to absorb NH3 molecules has been investigated.

Language

Greek

Subject

EDTMP

HDTMP

NH3 absorbance

corrosion inhibition

iron dissolution

phosphonates

polymeric compounds

αντιδιαβρωτική δράση

απορρόφηση ΝΗ3