Investigation of the hydrogen evolution phenomenon on CaCO3 precipitation in artificial seawater

Mineral cathodic electro-precipitation and its kinetic modelling in thin-film microfluidic reactor during advanced electro-oxidation process

“…The decrease in pH was the most remarkable in the electrolyte without carbonates since no buffer effect of HCO3 -/CO3 2was present in this matrix. Similar remark was also made by other authors, Tlili et al [64] and Piri et al [43], when they checked upon the variation of pH in bulk solution during the formation of CaCO3. This drop of pH value was ascribed to the consumption of OHthat partake in the reaction of Mg(OH)2 deposition according to Eq.…”

“…Therefore, bubble coverage at the electrode surface should have increased as described by Vogt et al [41]. Therefore, the more intense gas evolution at higher applied current density could have disturbed the layer of CaCO3 nuclei and in-parallel promoted the detachment of CaCO3 deposit [42,43,62].…”

“…Gas evolution on cathode surface contributes to two major consequences; firstly, less surface area could be available for mineral deposition on cathode surface [41]. Secondly, it could promote detachment of deposits occurring on the electrode [42,43].…”

Effect of PAAT as an Environmentally Friendly Terpolymer on the Scale Inhibition of CaCO3 in Artificial Seawater: Chemical and Electrochemical Study

“…This pH value was selected according to the work of Tlili et al who reported the dependency of interfacial pH change with respect to the electrode potential. Moreover, it was confirmed in previous work that CaCO 3 scale formation surely occurred at this pH value . It is worth noting that PAAT was first added to the solution along with NaHCO 3 and then CaCl 2 was introduced into the artificial solution.…”

State of art bio-materials as scale inhibitors in recirculating cooling water system: a review article

“…Electrochemical techniques, including chronoamperometry (CA), chronoelectrogravimetry, and impedancimetry, have proven very useful in the study of scale processes in a range of media (Belarbi et al 2016;Menzri et al 2017;Piri & Arefinia 2018), with the cathodic potential applied, the reduction of dissolved dioxygen form hydroxyl ions leading the electrode interfacial pH to increase, this accelerate CaCO 3 deposition according to the following equations: The non-conductive calcareous deposition on the electrode surface reduces the current density which is simultaneously recorded by chronoamperometric measurements, it reaches to the scaling time when the electrode surface is completely covered by the insulating layer of CaCO 3 , which represents the scaling condition of a sampling solution. Generally, among these electrochemical techniques, chronoamperometric is more basic and commonly used to evaluate scale inhibition efficiency while electrochemical impedance measurements allow observing the nucleation, growth, and total surface coverage of the deposition (Ketrane et al 2009;Zuo et al 2020).…”