| 引用本文： |
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蓝俊康,丁剀,吴孟.水化硅酸钙形成过程中对Cd(Ⅱ)、Zn(Ⅱ)的俘获作用[J].广西科学院学报,2009,25(3):195-197,200. [点击复制]
- LAN Jun-kang,DING Kai,WU Meng.Entrapment of Cd(Ⅱ),Zn(Ⅱ) by C-S-H during C-S-H Formation[J].Journal of Guangxi Academy of Sciences,2009,25(3):195-197,200. [点击复制]
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| 摘要: |
| 利用分析纯CaO,H2SiO3和Cd(NO3)2·4H2O[或Zn(NO3)2]在液相中人工合成n(Ca)/n(Si)为1.6和0.7的2种含Cd(Ⅱ)或含Zn(Ⅱ)的水化硅酸钙(C-S-H),研究C-S-H在形成过程中对Cd(Ⅱ)或Zn(Ⅱ)的俘获情况。结果表明,2种n(Ca)/n(Si)的C-S-H在俘获Cd(Ⅱ)后,其XRD图谱均发生明显的变化,特别是在Ca2+量不足[n(Ca)/n(Si)=0.7]的情况下,其晶格参数的变化较大,其特征峰无论是峰值还是峰位均发生了明显改变,表明有Cd2+替代Ca2+进入了C-S-H晶体。2种n(Ca)/n(Si)比值的C-S-H在俘获Zn(Ⅱ)后,其XRD图谱变化很微弱,仅特征峰的峰值稍有改变,但是这也显示出Zn(Ⅱ)进入了C-S-H晶体。C-S-H均能对Cd(Ⅱ)、Zn(Ⅱ)予以化学俘获。 |
| 关键词: 水化硅酸钙 俘获 Cd(Ⅱ) Zn(Ⅱ) |
| DOI： |
| 投稿时间：2009-04-23 |
| 基金项目:广西重点实验室研究基金项目(桂科能0701K009)资助 |
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| Entrapment of Cd(Ⅱ),Zn(Ⅱ) by C-S-H during C-S-H Formation |
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LAN Jun-kang, DING Kai, WU Meng
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| (Institute of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi, 541004, China) |
| Abstract: |
| In order to investigate the entrapment of Cd(Ⅱ) or Zn(Ⅱ),calcium-silicate-hydrate(C-S-H).C-S-Hcontaining Cd(Ⅱ) at n(Ca)/n(Si)=0.7 and 1.6 were synthesized using analytical reagent grade CaO,H2SiO3 and Cd(NO3)2·4H2O and C-S-H containing Zn(Ⅱ) at n(Ca)/n(Si)=0.7 and 1.6 were made from reagent CaO,H2SiO3 and Zn(NO3)2.The synthesis experiments showed that the X-ray diffraction patterns of C-S-H at n(Ca)/n(Si)=0.7 and 1.6 were both significantly changed after they doped with Cd(Ⅱ),especially when Ca2+ is deficient.The X-ray diffraction patterns of C-S-H at n(Ca)/n(Si)=0.7 changed obviously,both in peak values and at peak position.Indicating that Cd(Ⅱ) had entered into C-S-Hlattice in substitution for Ca2+.The experiments also showed that the X-ray diffraction patterns of C-S-H at n(Ca)/n(Si)=0.7 and 1.6 changed after they accommodated Zn(Ⅱ).Although the change was slight and only occurred to the peak value,which also indicated that some Zn(Ⅱ) had been captured into C-S-H lattice.This investigation verified that Cd(Ⅱ) or Zn(Ⅱ) could both be chemically entrapped by C-S-H. |
| Key words: calcium-silicate-hydrate entrapment divalent cadmium divalent zinc |
