| 摘要: |
| 通过溶液法人工合成不同钙硅比C S H凝胶,借助XRD,SEM,XPS,TEM,ICP等测试方法,分析研究了C S H凝胶对不同种类、不同含量重金属离子（Cr3+,Cr6+,Pb2+,Zn2+,Cd2+等）的俘获能力及其稳定性.结果表明:钙硅比不同,C S H凝胶对重金属离子固化稳定性及其固化机制均存在一定差异,高钙硅比C S H凝胶对重金属离子固化稳定性较强；重金属离子种类及价态不同,其在C S H凝胶中的结合方式及固化能力也不同,其中C S H凝胶对Cu2+,Cd2+,Zn2+等离子的固化能力较强,对Cr6+的固化能力较弱.水化液相中,C S H凝胶对Cr3+,Pb2+,Zn2+等多种重金属离子的固化能力低于其对单一重金属离子的固化能力；水化液相中Cr6+的存在,会对C S H凝胶对Pb2+的固化及其稳定性产生巨大影响,而Cr3+的存在对其影响则较小. |
| 关键词: C S H凝胶 重金属离子 固化 |
| DOI：103969/jissn1007 9629201405007 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划（973计划）项目(2010CB735803) |
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| Research on Effect of Different Heavy Metal Ions on C S H Gel and Its Stability |
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WANG Lan, YAN Bilan, WANG Xin, LIU Chen, LIU Jing
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State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing 100024, China
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| Abstract: |
| Through solution method to obtain artificially synthesized C S H gel with different calcium silicon ratio and by means of XRD, SEM, XPS, TEM, ICP testing methods, the ability and its stability of C S H gel to fix heavy metal ions such as Cr3+, Cr6+, Pb2+, Zn2+, Cd2+ etc. were studied. The research results show that there are some differences in ability of C S H gel to fix heavy metal ion and its fixing mechanism with respect to different calcium silicon ratios. The C S H gel with high calcium silicon ratio has a higher ability to fix heavy metal ions. Different types and valence of heavy metal ions have different ways of combination with C S H gel and fixing ability. C S H gel has stronger ability to fix Cu2+,Cd2+, Zn2+ ions, but quite weaker ability to fix Cr6+ ion. In the hydration liquid phase, the ability of C S H gel to fix multi heavy metal ions is weaker than its ability to fix a single heavy metal ions. At the same time, if there is Cr6+ ions in hydration liquid phase, the ability of C S H gel to fix Pb2+ ion would be greatly reduced, while Cr3+ ion has less impact on it. |
| Key words: C S H gel heavy metal ion fix |
