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采用静置吸附法分析聚丙烯酰胺(PAM)在侵蚀崩壁3个层次土壤的静态吸附行为,研究不同的液固比例、吸附时间对吸附量的影响,得出吸附等温线。结果表明:PAM在红土层和砂土层土壤中吸附的最佳液固比例是20∶1;在碎屑层土壤中的最佳液固比例是25∶1。PAM在红土层土壤中静态吸附量趋于零,主要受土壤质地、有机质含量等因素的影响;在砂土层和碎屑层土壤中,PAM浓度为100mg/L和200mg/L时,平衡吸附时间为28~32h;PAM浓度为300~500mg/L时,平衡吸附时间为20~24h;对砂土层和碎屑层土壤的吸附等温线进行回归拟合均符合Langmuir吸附模型。
The static adsorption behavior of polyacrylamide (PAM) on three levels of soil erosion wall was analyzed by static adsorption method. The effects of different liquid-solid ratio and adsorption time on the adsorption capacity were studied. The adsorption isotherms were obtained. The results show that the best ratio of liquid to solid adsorbed by PAM in the lateritic and sandy soils is 20: 1 and the best ratio of liquid to solid in the clayey soils is 25: 1. The static adsorption amount of PAM in the red soil layer tends to be zero, which is mainly affected by soil texture, organic matter content and other factors. When the PAM concentration is 100mg / L and 200mg / L in sand and clayey soil, equilibrium adsorption The time is 28 ~ 32h; when the concentration of PAM is 300 ~ 500mg / L, the equilibrium adsorption time is 20 ~ 24h; the regression fitting of the adsorption isotherms of sand and clayey soil are in accordance with the Langmuir adsorption model.