大块温石棉到纳米温石棉脱羟基的相变和动力学新见解

IF 1.2 4区 地球科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Physics and Chemistry of Minerals Pub Date : 2024-07-23 DOI:10.1007/s00269-024-01288-3
Jifa Long, Wentao Liu, Ningbo Zhang, Hanting Zhang, Qi Xiao, Suping Huang
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摘要

在这项工作中,自制的温石棉纤维膜(CFM)和温石棉原纤维(CF)在空气中进行了500至800 °C的煅烧。CFM 的 XRD 图谱显示,当温度从室温升至 550 ℃ 时,温石棉的衍射峰减弱,在 600-700 ℃ 时,CFM 的无定形间隔缩短。而 CF 在煅烧过程中没有出现无定形相,在 650 ℃ 时开始出现绿柱石。扫描电镜图像显示,CFM 在 600-800 ℃ 时仍能保持网络结构的完整性,而 CF 则随着煅烧温度的升高逐渐熔化成粗纤维束,并出现烧结痕迹。随后,研究了温石棉在 CFM 和 CF 中的脱羟动力学。CFM 的脱羟基反应为一步反应,计算的活化能为 243.33 kJ mol-1,符合二维 "Valensi "模型,机理函数为 G(α) = (1-α)ln(1-α) + α。CF 的脱羟基反应分为两个阶段,活化能分别为 222.87 kJ mol-1 和 316.04 kJ mol-1。CF 的第一阶段符合二维 "扬德 "模型(n = 2),机理函数 G(α) = [1-(1-α)1/2]2 ;CF 的第二阶段符合随机成核和后续生长的 "阿夫拉米-埃罗费耶夫 "模型(n = 3/2),机理函数 G(α) = [-ln(1-α)]2/3。
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New insight into the phase transition and kinetics of the dehydroxylation of bulk-to-nano chrysotile

In this work, the self-made chrysotile fiber membrane (CFM) and raw chrysotile fiber (CF) were calcined in air from 500 to 800 °C. The XRD pattern of CFM showed that the diffraction peak of chrysotile weakened when the temperature was from room temperature to 550 °C, and CFM had a shorter amorphous interval at 600–700 °C. While, no amorphous phase appeared in CF during calcination, and forsterite begined to appear at 650 °C. SEM images showed that CFM could still maintain the integrity of the network structure at 600–800 °C, while CF gradually melted into coarse fiber bundles with the increase of calcination temperature, and sintering traces appeared. After that,the kinetics of the dehydroxylation of chrysotile in CFM and CF was studied. The dehydroxylation of CFM is a one-step reaction, the calculated activation energy is 243.33 kJ mol−1, which conforms to the two-dimensional ‘Valensi’ model with mechanism function G(α) = (1−α)ln(1−α) + α. The dehydroxylation of CF is divided into two stages, the activation energy are 222.87 kJ mol−1 and 316.04 kJ mol−1. The first stage of CF conforms to two-dimensional ‘Jander’ model (n = 2) with mechanism function G(α) = [1−(1−α)1/2]2, the second stage of CF conforms to the random nucleation and subsequent growth ‘Avrami-Erofeev’ model (n = 3/2) with mechanism function G(α) = [−ln(1−α)]2/3.

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来源期刊
Physics and Chemistry of Minerals
Physics and Chemistry of Minerals 地学-材料科学:综合
CiteScore
2.90
自引率
14.30%
发文量
43
审稿时长
3 months
期刊介绍: Physics and Chemistry of Minerals is an international journal devoted to publishing articles and short communications of physical or chemical studies on minerals or solids related to minerals. The aim of the journal is to support competent interdisciplinary work in mineralogy and physics or chemistry. Particular emphasis is placed on applications of modern techniques or new theories and models to interpret atomic structures and physical or chemical properties of minerals. Some subjects of interest are: -Relationships between atomic structure and crystalline state (structures of various states, crystal energies, crystal growth, thermodynamic studies, phase transformations, solid solution, exsolution phenomena, etc.) -General solid state spectroscopy (ultraviolet, visible, infrared, Raman, ESCA, luminescence, X-ray, electron paramagnetic resonance, nuclear magnetic resonance, gamma ray resonance, etc.) -Experimental and theoretical analysis of chemical bonding in minerals (application of crystal field, molecular orbital, band theories, etc.) -Physical properties (magnetic, mechanical, electric, optical, thermodynamic, etc.) -Relations between thermal expansion, compressibility, elastic constants, and fundamental properties of atomic structure, particularly as applied to geophysical problems -Electron microscopy in support of physical and chemical studies -Computational methods in the study of the structure and properties of minerals -Mineral surfaces (experimental methods, structure and properties)
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