In Vitro Study on the Influence of Proline on Struvite Crystals

Year 2020, , 271 - 277, 31.12.2020

Sevgi Polat , Perviz Sayan

https://doi.org/10.17350/HJSE19030000196

Abstract

This study investigated the effect of amino acid proline, as crystal modifier, on the struvite crystallization in vitro conditions. The struvite crystals were evaluated experimentally through XRD, SEM, and FTIR to determine the structure, morphology, and chemical composition, respectively. XRD analysis pointed out that struvite crystals belonged to the orthorhombic Pmn21 space group. SEM analysis depicted that proline had a significant influence on the morphology as well as the particle size of the struvite. Moreover, the length and width of struvite crystals varied with different concentrations of proline. The length of struvite crystals decreased, and their width thickened in the presence of the crystal modifier. The negativity of the zeta potential value became less negative in the presence of proline and the values were determined to be –6.10 mV and -4.00 mV for 25 and 100 ppm, respectively. According to BET analysis results, the surface area of the struvite decreased in the proline media when compared with the crystals formed without the crystal modifier. In addition, the thermal degradation of the formed crystals was examined. Regarding the results of the thermodynamic analysis, the average ∆H , ∆G , and ∆S were 92.17 kJ/mol, 197.85 kJ/mol, and −254.63 J/mol K, respectively. As a result, this study could provide a potential crystal modifier for the inhibition of struvite stones.

Keywords

Struvite, Crystal Morphology, Crystallization, Characterization, Proline

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