Effect of nanoadditives on the kinetics of CaSO4 · 2H2O formation and the mosaic structure of crystals

Tyumentsev, V. A.; Fazlitdinova, A. G.; Dozhdikova, D. V.; Krivtsov, Igor

doi:10.1134/s0020168515010197

Cited by 5 publications

(2 citation statements)

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“…However, our latest studies, summarized in [ 47 ], reveal that scale formation in the bulk aqueous phase has a heterogeneous rather than a homogeneous nature. Recent publications on gypsum bulk crystallization indicate the crucial role of natural nanoimpurities with a particle size < 200 nm (nanodust) in solid phase formation kinetics [ 32 , 48 , 49 , 50 , 51 ]. At the same time, it was shown that such nanoimpurities are an unavoidable factor in any pure chemicals and solvents, to say nothing of industrial waters [ 50 , 51 ].…”

Section: Discussionmentioning

confidence: 99%

Application and Visualization of Fluorescent-Tagged Antiscalants in Electrodialysis Processing of Aqueous Solutions Prone to Gypsum Scale Deposition

et al. 2022

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Membrane scaling is a serious problem in electrodialysis. A widely used technique for controlling scale deposition in water treatment technologies is the application of antiscalants (AS). The present study reports on gypsum scale inhibition in electrodialysis cell by the two novel ASs: fluorescent-tagged bisphosphonate 1-hydroxy-7-(6-methoxy-1,3-dioxo-1Hbenzo[de]isoquinolin-2(3H)-yl)heptane-1,1-diyl-bis(phosphonic acid), HEDP-F and fluorescein-tagged polyacrylate, PAA-F2 (molecular mass 4000 Da) monitored by chronopotentiometry and fluorescent microscopy. It was found that cation-exchange membrane MK-40 scaling is sufficiently reduced by both ASs, used in 10−6 mol·dm−3 concentrations. PAA-F2 at these concentrations was found to be more efficient than HEDP-F. At the same time, PAA-F2 reveals gypsum crystals’ habit modification, while HEDP-F does not noticeably affect the crystal form of the deposit. The strong auto-luminescence of MK-40 hampers visualization of both PAA-F2 and HEDP-F on the membrane surface. Nevertheless, PAA-F2 is proved to localize partly on the surface of gypsum crystals as a molecular adsorption layer, and to change their crystal habit. Crystal surface coverage by PAA-F2 appears to be nonuniform. Alternatively, HEDP-F localizes on the surface of a deposit tentatively in the form of [Ca-HEDP-F]. The proposed mechanisms of action are formulated and discussed. The application of antiscalants in electrodialysis for membrane scaling mitigation is demonstrated to be very promising.

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Section: Discussionmentioning

confidence: 99%

Application and Visualization of Fluorescent-Tagged Antiscalants in Electrodialysis Processing of Aqueous Solutions Prone to Gypsum Scale Deposition

et al. 2022

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“…It is shown in [14] that the crystals CaSO4⋅2H2O have a block structure. In a semi-aqueous gypsum containing an additive of microsilica, during hydration, areas of coherent scattering of a new phase with the smallest average dimensions are formed.…”

Section: Introductionmentioning

confidence: 99%

Influence of the polymeric additives on the process of calcium sulfatedihydrate crystallization

Ustinova

2020

E3S Web Conf.

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The research is aimed to the clarification of the calcium sulfatedihydrate crystals growth and formation of in the presence of the different polymers based functional additives. The calcium sulfatedihydrate crystals have been synthesized both in the pure form and with the additives. The additives have included a super plasticizer based on a sulfonated melamine-formaldehyde resin (SMF), a methylcellulose (MC) and a redispersible polymer powder based on vinyl acetate, ethylene and vinyl chloride copolymers (VAEVC). The X-ray analysis and the electron microscopy have been applied to identify an influence of the polymer additives over the configuration and size of the calcium sulphate dihydrate crystals. The structural and strength characteristics of the gypsum materials have been also investigated.

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A Critical Review of Relative Scale Inhibition Performance of Different Alternatives

Popov,

Trukhina,

Tkachenko

et al. 2024

Industrial Scale Inhibition

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Effect of nanoadditives on the kinetics of CaSO4 · 2H2O formation and the mosaic structure of crystals

Cited by 5 publications

References 0 publications

Application and Visualization of Fluorescent-Tagged Antiscalants in Electrodialysis Processing of Aqueous Solutions Prone to Gypsum Scale Deposition

Application and Visualization of Fluorescent-Tagged Antiscalants in Electrodialysis Processing of Aqueous Solutions Prone to Gypsum Scale Deposition

Influence of the polymeric additives on the process of calcium sulfatedihydrate crystallization

A Critical Review of Relative Scale Inhibition Performance of Different Alternatives

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