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Preparation of α-calcium sulfate hemihydrate whiskers with high aspect ratios in presence of a minor amount of CuCl2·2H2O

少量CuCl2·2H2O 作用下制备高长径比α-半水硫酸钙晶须

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Abstract

In order to produce α-calcium sulfate hemihydrate (α-CaSO4·0.5H2O) whiskers with high aspect ratios, a minor amount of CuCl2·2H2O was used as the modifying agent in the process of hydrothermal treatment of calcium sulfate dihydrate (CaSO4·2H2O) precursor. The presence of 2.60×10-3 mol/L CuCl2·2H2O resulted in the increase of the aspect ratios of α-CaSO4·0.5H2O whiskers from 81 to 253. The preferential adsorption of Cu2+ on the negative {110} and {100} facets of α-CaSO4·0.5H2O crystal structures was confirmed by EDS and XPS. And ATR-FTIR demonstrated the ligand adsorption of Cu2+ on the surface of α-CaSO4·0.5H2O whiskers. The experimental results reveal that the whiskers with high aspect ratios are attributed to the adsorption of Cu2+, which promotes the 1-D growth of α-CaSO4·0.5H2O whiskers along the c axis.

摘要

为了制备高长径比的α-半水硫酸钙(α-CaSO4·0.5H2O)晶须,在以二水硫酸钙(CaSO4·2H2O) 前驱体为原料的水热反应过程中加入CuCl2·2H2O 作为媒晶剂。当反应体系中加入2.60×10-3 mol/L 的 CuCl2·2H2O 时可以使产物α-半水硫酸钙晶须的长径比由81 增加到253。EDS 和XPS 检测结果表明, CuCl2·2H2O 能够显著增加α-半水硫酸钙晶须的长径比主要是因为Cu2+优先吸附于α-CaSO4·0.5H2O 晶 体带负电的{110}和{100}面,从而阻碍了侧面的生长,最终导致晶体长径比的增加。ATR-FTIR 进一 步证实了Cu2+主要通过配位吸附的形式与α-CaSO4·0.5H2O 晶体表面进行作用。

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Authors and Affiliations

  1. School of Mineral Processing and Bioengineering, Central South University, Changsha, 410083, China

    Qing-jun Guan  (管青军), Wei Sun  (孙伟), Run-qing Liu  (刘润清), Zhi-gang Yin  (殷志刚) & Chen-hu Zhang  (张谌虎)

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  1. Qing-jun Guan  (管青军)
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  2. Wei Sun  (孙伟)
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  3. Run-qing Liu  (刘润清)
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Correspondence to Wei Sun  (孙伟) or Run-qing Liu  (刘润清).

Additional information

Foundation item: Project(B14034) supported by the National 111 Project, China; Project(2015CX005) supported by the Innovation Driven Plan of Central South University, China; Project(2016zzts104) supported by the Fundamental Research Funds for the Central Universities, China

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Guan, Qj., Sun, W., Liu, Rq. et al. Preparation of α-calcium sulfate hemihydrate whiskers with high aspect ratios in presence of a minor amount of CuCl2·2H2O. J. Cent. South Univ. 25, 526–533 (2018). https://doi.org/10.1007/s11771-018-3757-0

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