The reaction kinetics and Sn isotope fractionation of Sn(IV) chloride hydrolysis

IF 3.1 3区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Applied Geochemistry Pub Date : 2023-09-18 DOI:10.1016/j.apgeochem.2023.105793

Jia-Xin She , Weiqiang Li , Yuanfeng Cai

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引用次数: 0

Abstract

Hydrolysis of Sn is a pivotal step during the precipitation of cassiterite, the primary Sn-bearing mineral and thermodynamically stable Sn-oxide on Earth's surface. In this contribution, we investigated the reaction kinetics of Sn(IV) chloride hydrolysis by systematic experiments at temperatures of 6.4 °C to 28.6 °C. Experimental results show that the hydrolysis reactions of Sn(IV) chloride follow a first-order kinetics model, with rate constants (0.12 h⁻¹ to 5.5 h⁻¹) strongly controlled by temperature. Based on the obtained reaction constants at different temperatures and the Arrhenius equation, the activation energy of the Sn(IV) chloride hydrolysis reaction is calculated to be 26.05 ± 2.25 kcal/mol, indicating a surface-controlled reaction mechanism. Additionally, the Sn(IV) chloride hydrolysis rate increases with the ionic strength. No significant Sn isotope fractionation between aqueous Sn(IV) and the solid hydrolysis product was observed during the Sn(IV) hydrolysis experiments in this study. The activation energy data and Sn isotope behavior associated with Sn(IV) chloride hydrolysis may be used to better understand the behavior of Sn during various mineralization and weathering processes.

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氯化锡水解反应动力学及锡同位素分馏

锡的水解是锡石沉淀过程中的关键步骤，锡石是地球表面主要的含锡矿物和热力学稳定的氧化锡。在这篇文章中，我们通过系统实验在6.4°C至28.6°C的温度下研究了氯化锡（IV）水解的反应动力学。实验结果表明，氯化锡的水解反应遵循一级动力学模型，速率常数（0.12 h−1至5.5 h−1）强烈受温度控制。根据获得的不同温度下的反应常数和Arrhenius方程，计算出氯化锡水解反应的活化能为26.05±2.25kcal/mol，表明反应机理为表面控制。此外，氯化锡的水解速率随着离子强度的增加而增加。在本研究中的Sn（IV）水解实验中，在水性Sn（Ⅳ）和固体水解产物之间没有观察到显著的Sn同位素分馏。与氯化锡水解相关的活化能数据和锡同位素行为可用于更好地了解锡在各种矿化和风化过程中的行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Geochemistry 地学-地球化学与地球物理

CiteScore

6.10

自引率

8.80%

发文量

272

审稿时长

65 days

期刊介绍： Applied Geochemistry is an international journal devoted to publication of original research papers, rapid research communications and selected review papers in geochemistry and urban geochemistry which have some practical application to an aspect of human endeavour, such as the preservation of the environment, health, waste disposal and the search for resources. Papers on applications of inorganic, organic and isotope geochemistry and geochemical processes are therefore welcome provided they meet the main criterion. Spatial and temporal monitoring case studies are only of interest to our international readership if they present new ideas of broad application. Topics covered include: (1) Environmental geochemistry (including natural and anthropogenic aspects, and protection and remediation strategies); (2) Hydrogeochemistry (surface and groundwater); (3) Medical (urban) geochemistry; (4) The search for energy resources (in particular unconventional oil and gas or emerging metal resources); (5) Energy exploitation (in particular geothermal energy and CCS); (6) Upgrading of energy and mineral resources where there is a direct geochemical application; and (7) Waste disposal, including nuclear waste disposal.