Application of fluorescent-tagged antiscalants for mitigation of membrane scaling by calcium carbonate and calcium phosphate in electrodialysis stack

International Journal of Corrosion and Scale Inhibition, Journal Year: 2024, Volume and Issue: 13(1)

Published: March 30, 2024

Wide application of electrodialysis, which is proven to be highly effective in waste waters treatment and a broad spectrum other technologies, restrained by membrane fouling.The present study dedicated the fluorescent-tagged antiscalants (ASs) for mitigation scaling calcium carbonate phosphate electrodialysis stack within set model experiments.Hydroxyethylidenebis(phosphonic acid), conjugated with naphthalimide (HEDP-F), two fluoresceine-tagged polyacrylates (PAA-F2 PAA-F2S) are tested.It demonstrated that all three ASs efficient CaCO3 retardation: PAA-F2S>PAA-F2>HEDP-F.The similar efficiency found case CaHPO4•2H2O: PAA-F2S>PAA-F2 >>HEDP-F.At same time, PAA-F2S PAA-F2 affect crystal habit both CaHPO4•2H2O, while HEDP-F does not.However, due visualization it there no direct relevance between scale inhibition efficacy an ability growth kinetics form deposit.The major effect detected at nucleation step: increase induction time.However, definite decrease rate stages following registered relative blank run.Meanwhile, most AS molecules stay aqueous phase till end formation only then do they begin get adsorbed deposit.Notably, CaCO3, reveal selective sorption on vaterite, bit less intensive flake-like modification calcite least rhomboherdal surfaces.In way, demonstrate location plate-like modifications but presence pellet-like this mineral.It shown correlation rate.The observed effects interpreted terms interactions natural nanoimpurities acting as crystallization centers step.

Language: Английский

Potential Nano/Microcenters of Crystal Nucleation in Reagent-Grade Purity Solvents and Their Differentiation by Fluorescent-Tagged Antiscalant

Crystals, Journal Year: 2024, Volume and Issue: 14(7), P. 650 - 650

Published: July 15, 2024

A common issue in studies on liquid-phase chemical processes is that the natural solid nanoimpurities present reagent-grade chemicals are ignored. Little known about these impurities’ nature, sizes, concentrations, and behavior, yet they significantly affect efficiency of antiscalants municipal laboratory solutions. Recent research has focused on: (i) estimating nanoimpurity concentrations in-house deionized water semiconductor-grade isopropanol using “light sheet” optical ultramicroscopy, (ii) visualizing antiscalant sorption impurities. Using a fluorescent-tagged aminobis(methylenephosphonic acid) (ADMP-F), we tracked its affinity to particulate matter KCl Our study showed total concentration nanoparticles with size larger than 20 nm 106 units/mL 105 isopropanol. Extrapolation values ≥1 resulted 1011 108 units/mL. The addition or ADMP-F increased foreign nanoparticle populations. selectively adsorbed by only some impurities, while most molecules remain as true solution. To our knowledge, this first instance fluorescently labeled aminoalkylphosphonates being able differentiate traces purity Therefore, role crystallization centers should be seriously reconsidered, especially their important application scale inhibition.

Language: Английский