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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。
Two Cd (Ⅱ) or Cd (Ⅱ) -containing complexes of n (Ca) / n (Si) 1.6 and 0.7 were synthesized in the liquid phase by analytical CaO, H2SiO3 and Cd (NO3) 2.4H2O [or Zn (NO3) The hydrated calcium silicate (CSH) containing Zn (Ⅱ) was used to study the trapping of Cd (Ⅱ) or Zn (Ⅱ) during the formation of CSH. The results showed that the XRD patterns of two CS (n) / n (Si) CSHs obviously changed after Cd (Ⅱ) was captured, especially when the content of Ca2 + was less than [ 0.7], the crystal lattice parameter changes greatly, and its characteristic peak changes obviously both in peak and peak position, indicating that Cd2 + replaces Ca2 + into CSH crystal. After the Zn (Ⅱ) was trapped by the two kinds of CSH with the ratio of n (Si), the change of XRD pattern was very weak and only the peak of the characteristic peak changed slightly. However, it also showed that Zn (Ⅱ) Crystal. C-S-H can all chemically capture Cd (Ⅱ) and Zn (Ⅱ).