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用盐酸腐蚀玻璃纤维,可使其具有多孔性。测定了有不同失重的样品的低温氮吸附等温线。三参数 BET 方程能很好关联这些等温线。n 值随失重增加而减小。应用三参数方程中的常数 C 值选用标准等温线获得的 S_t 与三参数 S_(BET)很一致。应用 WP 法,MP 法和 D-R 法分析了玻璃纤维的孔结构。结果表明,除失重为4%的样品外(无微孔),用单一方法获得的结果均不理想。使用组合的 MP-WP 和 D-R-WP 法能获得满意的结果。我们发现三参数 BET 方程中的 n 值可用来表征平均微孔半径,并可粗略地用于估算吸附位能常数。我们也发现,微孔表面和体积随失重而增加,平均微孔半径下降,非微孔表面积变化不大。用作催化剂载体,使用低失重玻璃纤维较为合适。
Corrosion of glass fibers with hydrochloric acid gives it porosity. Low temperature nitrogen adsorption isotherms were measured for samples with different weight loss. The three-parameter BET equation is well correlated with these isotherms. The value of n decreases with weight loss. The value of constant C in the three-parameter equation is consistent with that of the three-parameter S_ (BET) using standard isotherms. The pore structure of glass fiber was analyzed by using WP method, MP method and D-R method. The results showed that, except for 4% weight loss samples (no micropores), the results obtained by a single method are not ideal. Satisfactory results can be obtained using the combined MP-WP and D-R-WP methods. We found that the n-value in the three-parameter BET equation can be used to characterize the average pore radius and can be roughly used to estimate the adsorption potential constant. We also found that the micropore surface and volume increased with weight loss, the average micropore radius decreased, and the non-micropore surface area changed little. For use as a catalyst support, it is more suitable to use low weight loss glass fibers.