Issue 12, 2006
From the journal:

CrystEngComm

Understanding the mechanism by which nitrilotriacetic acid interacts with precipitating barium sulfate†

F. Jones,*a   A. Oliveira,a   A. L. Rohl,b   M. I. Ogdena  and  G. M. Parkinsona  

* Corresponding authors

a AJ Parker CRC for Integrated Hydrometallurgy Solutions, Nanochemistry Research Institute, Department of Applied Chemistry, Curtin University of Technology, GPO Box U1987, Perth, Australia
E-mail: franca@ivec.org
Fax: (618) 9266 4699
Tel: (618) 9266 7677

b iVEC, ‘The hub of advanced computing in Western Australia’, 26 Dick Perry Avenue, Technology Park, Kensington, Australia

Abstract

Morphology modifiers can act in many different ways on the precipitating phase. Inhibitors can alter the solution chemistry and thereby change the supersaturation, they may adsorb onto the surface and block growth and agglomeration, they may alter the critical nucleus and affect nucleation or they may do a combination of these three. Previous work showing that nitrilotriacetic acid (NTA) had a significant effect on barium sulfate precipitation has been expanded upon in order to determine the mechanism by which the observed morphology modification occurs. The absence of significant complexation to barium at the pH of the experiment suggests that NTA affects the critical nuclei of the precipitating barium sulfate. This results in the longer induction times observed using nephelometry, and adsorption onto growth features is probably the mechanism of interaction. Molecular modelling shows that NTA adsorption is favourable on terraces and that hydrogen bonding improves the ability of an additive to adsorb. A fundamental understanding of the mechanisms by which additives affect crystal growth is essential if new additives, with predictable effect, are to be designed a priori.

Graphical abstract: Understanding the mechanism by which nitrilotriacetic acid interacts with precipitating barium sulfate

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Article information

DOI
https://doi.org/10.1039/B608302A
Article type
Paper
Submitted
12 Jun 2006
Accepted
03 Oct 2006
First published
12 Oct 2006

CrystEngComm, 2006,8, 869-876

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Understanding the mechanism by which nitrilotriacetic acid interacts with precipitating barium sulfate

F. Jones, A. Oliveira, A. L. Rohl, M. I. Ogden and G. M. Parkinson, CrystEngComm, 2006, 8, 869 DOI: 10.1039/B608302A

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