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Improvement of acid modification and its effect on the adsorption of stearic acid into sepiolite

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Abstract

To improve sepiolite's ability to absorb stearic acid, different hydrochloric acid modification conditions were used to modify sepiolite. Stearic acid was encapsulated by direct dipping modified sepiolite. The leakage test was carried out. The crystal structure, microstructure, latent heat, thermal stability and thermal conductivity were characterized. The improved acidification condition of 4 mol L−1 for hydrochloric acid concentration, 6 h for acidification time and 313.15 K for acidification temperature can improve the load rate of stearic acid for 5 mass% relative to previous experimental data, the load mass fraction of stearic acid can reach to 40%. The composite prepared by improving acidification conditions has higher latent heat of melting and solidification of 74.66 J g−1 at 346.65 K and 77.02 J g−1 at 332.05 K, respectively. The composite phase change materials prepared by physical stirring have good chemical compatibility and thermal durability.

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Acknowledgments

This work was supported by the Scientific Research Fund of Hunan Provincial Education Department (No. 19C1767), the National Natural Science Foundation of China (No. 51906094), the Public Welfare Technological Research Program of Science and Technology Department of Zhejiang Province (No. LGG18E060003) and the Research Program of Science and Technology Bureau of Lishui City (No. 2017RC03).

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Authors and Affiliations

  1. Department of Process Equipment and Control Engineering, School of Mechanical Engineering, Xiangtan University, Xiangtan, 411105, People’s Republic of China

    Wen-Tao Yan & Wei-Biao Ye

  2. School of Biological and Chemical Engineering, Guangxi University of Science and Technology, Liuzhou, 545006, People’s Republic of China

    Juan Du & Yuxiang Hong

  3. Department of Chemistry and Chemical Engineering, Lishui University, Lishui, 323000, People’s Republic of China

    Juan Du & Yuxiang Hong

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  1. Wen-Tao Yan
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  2. Wei-Biao Ye
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  3. Juan Du
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  4. Yuxiang Hong
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Correspondence to Wei-Biao Ye.

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Appendix

Appendix

The instrument error

1. Ten-thousandth balance:

 Weighing accuracy: 10−4 g;

2. Blast drying box:

 The temperature error: ± 1℃;

3. Scanning electron microscopy (S4800):

 Electronic image movement: ± 12 µm;

4. XRD (D8 ADVANCE DAVINCI):

 Precision of Angle: ± 0.0001°;

5. DSC (DSC214):

 Temperature repeatability: ± 0.01 ℃ (Standard metal);

 Enthalpy sensitivity: 0.1 µW

 Enthalpy precision: ± 0.05% (Standard metal);

6. TGA (NETZSCH5, TGA 8000-Spectrum two-Clarus SQ8T):

 Thermal drift: < 10 µg;

 Weighing accuracy: 10 ppm;

7. Thermal conductivity tester (TPS 2500 S):

 Measurement error: < 3%;

 Thermal diffusion coefficient: < 5%;

 Volumetric specific heat: < 7%;

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Yan, WT., Ye, WB., Du, J. et al. Improvement of acid modification and its effect on the adsorption of stearic acid into sepiolite. J Therm Anal Calorim 147, 3025–3032 (2022). https://doi.org/10.1007/s10973-021-10633-5

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  • DOI: https://doi.org/10.1007/s10973-021-10633-5

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