不同钙硅比C-S-H对多种重金属离子的俘获及其稳定性

The Research on Capturing Several Heavy Metal Irons and Its Stability of C-S-H with Different Ca/Si

通过溶液法人工合成不同C/S的C-S-H,分析比较了C-S-H对多种重金属离子俘获能力及其稳定性。研究结果表明,多种重金属离子共存下,低钙硅比C-S-H对重金属离子俘获主要以物理吸附为主,高钙硅比C-S-H对重金属离子的俘获则以化学结合主,其对重金属离子固化作用较前者稳定。无论钙硅比高低,多种离子共存下,C-S-H对Cu2+、Cd2+离子均有很强的固化能力,但对Pb2+离子的固化及稳定性较差。重金属离子价态不同,C-S-H俘获固化作用存大巨大差异,C-S-H对Cr3+俘获作用较强,但对Cr6+固化不起主要作用且稳定性较差。水化液相中Cr6+离子的存在,对Pb2+离子在C-S-H中固化有极大影响。

C-S-H with different Ca/Si were synthesized in solution,this article compared capturing ability and stability of C-S-H in the presence of several heavy metal ions,such as Cr3＋（Cr6＋）、Pb2＋、Cu2＋、Zn2＋、Cd2＋.Under the coexistence of those ions,capturing method of C-S-H with low Ca/Si mainly is physical absorption,and that of C-S-H with high Ca/Si mainly is chemical combination.But high Ca/Si C-S-H showed more stable.Under the coexistence of different ions,in spite of Ca/Si,C-S-H showed very high capture ability to Cu2＋ and Cd2＋,but poor ability to Pb2＋.There is big difference among C-S-H with different valence state.For example,C-S-H showed high capture ability to Cr3＋,but low ability to Cr6＋ and its has poor stable,too.In solution,Cr6＋ has great influence on C-S-H capturing Pb2＋.