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考察了温度、悬浮液浓度、相对分子质量对聚乙烯醇 ( PVA)在 α- Al2 O3颗粒上吸附的影响 ,实验测定了相对分子质量为 80 0 0 0和 56 0 0的 PVA在 2 88.1 5K、2 98.1 5K和 30 8.1 5K、α- Al2 O3悬浮液质量浓度为 0 .0 5、0 .1 0和 0 .1 5时的吸附等温线 ,用 Langmuir吸附模型对实验数据进行了关联。结果表明 ,吸附量随悬浮液浓度的增加或温度的升高而降低 ,随 PVA相对分子质量的增加而增加。PVA相对分子质量越大 ,其吸附等温线受温度、悬浮液浓度的影响也越大。
The effects of temperature, suspension concentration and molecular weight on the adsorption of PVA onto α-Al 2 O 3 particles were investigated. The PVA with relative molecular mass of 80 000 and 56 0 0 was measured at 2 88.1 5K , 2 98.1 5K and 30 8.1 5K, respectively. The adsorption isotherms of the α-Al 2 O 3 suspension at the concentrations of 0.050, 0.100 and 0.15 were correlated with the experimental data by the Langmuir adsorption model. The results showed that the adsorption capacity decreased with the increase of the concentration of suspension or temperature, and increased with the increase of molecular weight of PVA. The larger the relative molecular mass of PVA is, the more the adsorption isotherm is affected by the temperature and the concentration of the suspension.