Rabizadeh, T, Peacock, CL orcid.org/0000-0003-3754-9294 and Benning, LG orcid.org/0000-0001-9972-5578 (2020) Investigating the Effectiveness of Phosphonate Additives in Hindering the Calcium Sulfate Dihydrate Scale Formation. Industrial & Engineering Chemistry Research, 59 (33). pp. 14970-14980. ISSN 0888-5885
Abstract
The effects of 20 ppm 1-hydroxy ethylidene-1,1-diphosphonic acid (HEDP), amino trimethylene phosphonic acid (ATMP), polyamino poly(ether methylene phosphonic acid) (PAPEMP), diethylene triamine penta (methylene phosphonic acid) (DTPMPA), and bis(hexamethylene triamine penta (methylene phosphonic acid)) (BHMTPMPA) on the room-temperature crystallization of calcium sulfate dihydrate (gypsum) were investigated by in situ UV–vis, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES), and scanning electron microscopy (SEM) techniques. A comparison between additive-containing and additive-free experiments showed that BHMTPMPA was the most efficient antiscalant by completely inhibiting crystallization. Due to the chain length of the BHMTPMPA molecule, the crystallization kinetics decreased to a larger extent than DTPMPA. The increase in pH of the solution from ∼4 to ∼7 positively enhanced the efficiency of the phosphonates in inhibiting crystallization. Our results revealed that partially deprotonated phosphonate additives were strongly associated with gypsum crystals and/or potentially taken up into the crystal matrix, resulting in a sudden and sharp increase in turbidity plots. Furthermore, phosphonate additives altered the thin, twinned gypsum crystals into thick needles.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 American Chemical Society. This is an author produced version of an article published in Industrial & Engineering Chemistry Research (IECRED). Uploaded in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) |
Funding Information: | Funder Grant number EU - European Union 290040 EU - European Union 290040 EU - European Union 290040 EU - European Union 290040 |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Sep 2020 12:01 |
Last Modified: | 26 Jul 2021 00:38 |
Status: | Published |
Publisher: | American Chemical Society |
Identification Number: | 10.1021/acs.iecr.0c03600 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:165710 |