采用分析纯试剂合成的C3 S和纳米SiO2水化制备浆体，利用ζ-电位仪、X-射线衍射仪和N2-吸附脱附表征浆体的电性能、物相组成和比表面积，研究了用去离子水拌合的浆体对K＋和Na＋的吸附与脱附性能和用碱溶液拌合的浆体持留K＋和Na＋的能力。结果表明：在碱溶液中，采用去离子水拌合的C3 S-纳米SiO2浆体粉末吸附K＋和Na＋的量随碱溶液浓度的升高而增大；采用碱溶液拌合的浆体粉末经去离子水充分洗涤后，浆体中仍残留部分K＋和Na＋。纳米SiO2掺量越大，浆体对K＋和Na＋的吸附能力越大。采用去离子水拌合的C3 S-纳米SiO2浆体粉末对K＋和Na＋的吸附主要是物理吸附。浆体对K＋和Na＋的吸附无明显选择性。
C3 S synthesized with analytically pure compounds and nano-SiO2 were used to prepare pastes . The electrical properties , phase composition and specific surface area of the pastes were characterized by means of ζpotential measurement , X-ray diffraction and adsorption-desorption of N 2 , respectively .The adsorption and desorption properties of K +and Na +by the pastes mixed with de-ionized water or alkali solutions were investigated .The results show that the higher the replacement level of nano-SiO2 , the larger the ability of C 3 S-nano-SiO2 pastes to bind alkali .There is no obvious difference between amount of K+and Na +adsorbed by the pastes .Adsorption of K +and Na +by the pastes mixed with de-ionized water is mainly with physical adsorption .There are few residual alkali ions in the pastes mixed with alkali solutions after washed with enough de-ionized water .
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