The dissolution and precipitation kinetics of solid particles: the influence of adsorption

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Jake M. Yang, Richard G. Compton
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引用次数: 0

Abstract

The dissolution or growth of solid particles, analogous to electro-dissolution and deposition processes, can occur either under mass transport or surface kinetic control with the latter considered increasingly likely as the size of the particle decreases since the rate of diffusion scales inversely with particle size. The conditions under which these processes are influenced by the adsorption of species onto the dissolving or growing surface are explored both generically and illustrated by the specific case of calcite (CaCO3) particle formation/dissolution in aqueous solution forming or from the component ions. Under surface control, the presence of adsorbed species leads to ‘blocking’ of the reactive surface, and a corresponding reduction in the observed rate. Under mass transport control, the concentrations of the various species in the layer of solution next to the solid are in equilibrium with the solid. They are thus pinned by the pertinent solubility product coupled with the solute fluxes in and out of the diffusion layer. In this situation, adsorption effects on the kinetics of dissolution/growth emerge in the observed effective thermodynamic solubility product as inferred from experiment. The predictions for the reduction in the rate of calcite dissolution in aqueous solution in the presence of dissolved Mg2+ cations are in quantitative agreement with experiment suggesting that for solids such as calcium carbonate, the effective solubility product and hence dissolution or precipitation rate is generically dependent on the identity and coverage of the adsorbate.

固体颗粒的溶解和沉淀动力学:吸附的影响
固体颗粒的溶解或生长,类似于电溶解和沉积过程,可以在质量传递或表面动力学控制下发生,由于扩散速率与颗粒尺寸成反比,随着颗粒尺寸的减小,后者被认为越来越可能发生。这些过程受到物质吸附到溶解或生长表面的影响的条件,通过方解石(CaCO3)颗粒形成/溶解在水溶液中形成或由组分离子形成的具体情况进行了一般探索和说明。在表面控制下,吸附物质的存在导致反应表面的“阻塞”,并相应降低观察到的速率。在质量输运控制下,靠近固体的溶液层中各种物质的浓度与固体处于平衡状态。因此,它们由与扩散层内外溶质通量耦合的相关溶解度积固定。在这种情况下,吸附对溶解/生长动力学的影响出现在实验中观察到的有效热力学溶解度产物中。在溶解的Mg2+阳离子存在下,方解石在水溶液中溶解速率降低的预测与实验结果在定量上一致,这表明对于碳酸钙等固体,有效溶解度乘积以及因此产生的溶解或沉淀速率通常取决于吸附质的特性和覆盖范围。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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