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选择中分子量(800万)、高分子量(1200万)的聚丙烯酰胺(PAM),通过静态法和淀粉-三碘化物比色法相结合方法针对砂壤土对两种分子量PAM的吸附行为进行研究,并探究了砂壤土对不同分子量PAM在不同液固比和不同吸附时间下吸附量的影响。探究结果表明,两种分子量PAM在砂壤土中吸附的最佳液固比均为25∶1,吸附平衡时间分别为6h、8h。利用Langmiur等温吸附方程对数据进行回归拟合,拟合的相关系数均在0.96以上,故量两种分子量的PAM在砂壤土上的吸附等温线符合Langmiur模型,说明砂壤土对两种分子量PAM的吸附是单分子层吸附。并得到两种分子量PAM在砂壤土中的吸附量为800万分子量>1200万分子量,其饱和吸附量分别是1.11 mg g-1、1.04 mg g-1。
The polyacrylamide (PAM) with medium molecular weight (8 million) and high molecular weight (12 million) was selected to study the adsorption behavior of two molecular weight PAMs by the combination of static method and starch triiodide colorimetry. And explored the influence of sandy loam on the adsorption capacity of different molecular weight PAM at different liquid-solid ratios and different adsorption times. The results showed that the optimum liquid-solid ratio of PAM with two molecular weights adsorbed in sandy loam soil was 25:1, and the adsorption equilibrium time was 6h and 8h, respectively. The Langmiur isotherm equation was used to fit the data. The correlation coefficient of fitting was above 0.96. Therefore, the adsorption isotherms of PAM with two molecular weights on sandy loam conform to Langmiur model, indicating that sandy loam to two kinds of molecular weight PAM Adsorption is monolayer adsorption. The results showed that the adsorption capacity of PAM with two molecular weights in sandy loam soil was 8 million molecular weight> 12 million molecular weight, and its saturated adsorption capacity was 1.11 mg g-1 and 0.04 mg g-1, respectively.