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8 results for “Precipitation kinetics”
Silica dissolution and precipitation kinetics in hot geothermal conditions
<p>This dataset report quartz dissolution kinetics as obtained from packed column experiments at different flow rates. Variables were temperature, pressure and NaCl content as incicated in the table. Silica values are reported as mg/L of Si as measured by ICP-OES. Also included in the table is a column describing how data series were treated to extract steady-state values for each flow rate (cf. the report to which the current dataset is related). The column "solubility used" states the solubility used to calculate dissolution (k<sub>+</sub>) and precipitation (k<sub>-</sub>) rate constants along with a column "source" which briefly indicates how this value was obtained. Further details are given in the report.</p> <p>Factors used to get from the raw data to the reported rate constants are also given. Not included in the table, but common for all data points are a quartz BET surface are of 0.6922 m<sup>2</sup>/g, 10 g quartz and a quartz activity assumed to be 1.</p> <p>Note that this dataset contain several measurement points that are not representative. These include points close do equilibrium where kinetic information cannot be reliably obtained and points where it is suspected that a temperature drop during sampling may have caused erroneous results (the Si content actually represents a somewhat lower temperature that was not measured). The reader is referred to the full report for details.</p>
Supporting data for "Understanding the impact of precipitation kinetics on the electrochemical performance of lithium–sulfur batteries by operando X-ray diffraction"
<p>This is the dataset of electrochemical and operando X-ray diffraction measurements for our publication "Understanding the impact of precipitation kinetics on the electrochemical performance of lithium–sulfur batteries by operando X-ray diffraction". This archive contains the raw data and scripts written in R used in the analysis and presentation of the results in this manuscript.</p> <p>Abstract of the manuscript:</p> <p>The complex reaction mechanism of the lithium–sulfur battery system consists of repetitive dissolution and precipitation of the sulfur-containing species in the positive electrode. In particular, the precipitation of lithium sulfide (Li<sub>2</sub>S) during discharge has been considered a crucial factor for obtaining a high degree of active material utilization. Here, the influence of electrolyte amount, electrode thickness, applied current and electrolyte salt on the formation of Li<sub>2</sub>S is systematically investigated in a series of operando X-ray diffraction experiments. Through a combination of simultaneous diffraction and resistance measurements, the evolution of Li<sub>2</sub>S is directly correlated to the variation in internal resistance and transport properties inside the positive electrode. The correlation indicates that at different stages, the Li<sub>2</sub>S precipitation both facilitates and impedes the discharge process. This information on the kinetics of Li<sub>2</sub>S formation offers mechanistic explanations for the strong impact of different electrochemical cell parameters on the cell performance and thus, directions for holistic optimizations to achieve high sulfur utilization.</p> <p> </p>
Liquid-liquid phase reaction between crystal violet and sodium hydroxide: kinetic study and precipitate analysis
<p>To investigate reaction order and kinetic parameters of the reaction between crystal violet (CV) and sodium hydroxide (NaOH), various concentrations of the reactants were applied. The present work also verifies the unknown solid product produced under highly concentrated conditions. The reaction orders of CV and NaOH were determined to be 1 and 1.17 by pseudo-rate method, respectively, with a rate constant, k, of 0.084 [(M-1.17) s-1]. In addition to pseudo-rate method, the half-life approach is use to calculated the overall reaction order to verify the accuracy of pseudo-rate method. The overall reaction order is determined to be 1.9 by half-life method. Compare reaction order gained from both methods, the overall reaction order is determined as ~2. The precipitate formation was observed when high concentrations of CV (0.01~0.1 M) and NaOH (1.0 M) were applied. Fourier transform infrared (FTIR) spectroscopy was used to compare the spectra of the precipitate generated and a commercial solvent violet 9 (SV9). Based on the FTIR spectra, it was confirmed that the molecular structure of the precipitate matched that of solvent violet 9.</p>
Dataset on the effects of mineral grain size and seawater salinity on Mg(OH)2 dissolution and CaCO3 precipitation kinetics.
<p>Dataset from the manuscript "Effects of grain size and seawater salinity on magnesium hydroxide dissolution and secondary calcium carbonate precipitation kinetics: implications for ocean alkalinity enhancement" from Moras et al., 2024 (https://doi.org/10.5194/egusphere-2024-645). The dataset compiles all data used in the manuscript. The manuscript covers Mg(OH)2 dissoluton and CaCO3 precipitation kinetics for Ocean Alkalinity Enhancement. These kinetics are reported under different conditions, such as varying grain size and seawater salinity.</p>
Liquid-liquid phase reaction between crystal violet and sodium hydroxide: kinetic study and precipitate analysis
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Data from: Kinetics of calcite precipitation by ureolytic bacteria under aerobic and anaerobic conditions
The kinetics of urea hydrolysis (ureolysis) and induced calcium carbonate (CaCO3) precipitation for engineering use in the subsurface was investigated under aerobic conditions using Sporosarcina pasteurii (ATCC strain 11859) as well as Bacillus sphaericus strains 21776 and 21787. All bacterial strains showed ureolytic activity inducing CaCO3 precipitation aerobically. Rate constants not normalized to biomass demonstrated slightly higher rate coefficients for both ureolysis (kurea) and CaCO3 precipitation (kprecip) for B. sphaericus 21776 (kurea = 0.10 ± 0.03 h-1, kprecip = 0.60 ± 0.34 h-1) compared to S. pasteurii (kurea = 0.07 ± 0.02 h-1, kprecip = 0.25 ± 0.02 h-1) though these differences were not statistically significantly different. B. sphaericus 21787 showed little ureolytic activity but was still capable of inducing some CaCO3 precipitation. Cell growth appeared to be inhibited during the period of CaCO3 precipitation. TEM images suggest this is due to the encasement of cells and was reflected in lower kurea values observed in the presence of dissolved Ca. However, biomass re-growth could be observed after CaCO3 precipitation ceased, which suggests that ureolysis-induced CaCO3 precipitation is not necessarily lethal for the entire population. The kinetics of ureolysis and CaCO3 precipitation with S. pasteurii were further analyzed under anaerobic conditions. Rate coefficients obtained in anaerobic environments were comparable to those under aerobic conditions, however no cell growth was observed under anaerobic conditions with NO3-, SO42- and Fe3+ as potential terminal electron acceptors. These data suggest that the initial rates of ureolysis and ureolysis-induced CaCO3 precipitation are not significantly affected by the absence of oxygen but that long-term ureolytic activity might require the addition of suitable electron acceptors. Variations in the ureolytic capabilities and associated rates of CaCO3 precipitation between strains must be fully considered in subsurface engineering strategies that utilize microbial amendments.
Precipitation-induced dissipation limits storm kinetic energy in a warming climate
<p>This zip file contains data and codes to reproduce the figures of a manuscript on precipitation-induced dissipation in X-SHiELD.</p> <p>Contact mbolot@princeton.edu for questions.</p>
Data from: Kinetics of calcite precipitation by ureolytic bacteria under aerobic and anaerobic conditions
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