Abstract: The influences of acid,alkali and graft copolymerization modifications on the adsorption effect of corn straws for ammonia nitrogen have been compared. The results show that when initial ammonia concentration is 200 mg/L, the maximum ammonia nitrogen equilibrium adsorption quantities of acid,alkali and graft copolymerization modifications are 23.4,26.4 and 33.8 mg/g,respectively and compared with the results from the unmodified corn straw, increased by 55.0%,74.8% and 123.8%. The modified adsorption effects are as follows:graft copolymerization modification > alkali modification > acid modification. The adsorption course of corn straws for ammonia nitrogen can be described by Langmuir and Freundlich adsorption isotherm models, complying with pseudo second order kinetic equation. After being subjected to the modification treatment, it is found that △G is decreased and the adsorption for ammonia nitrogen becomes easier.

Key words: corn straw, modification, ammonia nitrogen, adsorption

摘要： 对比了酸改性、碱改性和接枝共聚改性对玉米秸秆吸附氨氮性能的影响。结果表明，当初始氨氮质量浓度为200 mg/L时，玉米秸秆经酸改性、碱改性和接枝共聚改性的最大氨氮平衡吸附量分别达到23.4、26.4、33.8 mg/g，较未改性时分别提高55.0%、74.8%和123.8%，改性吸附效果为接枝共聚改性 > 碱改性 > 酸改性。玉米秸秆对氨氮的吸附过程可用Langmuir和Freundlich吸附等温模型描述，符合伪二级动力学方程。经过改性处理后△G降低，对氨氮的吸附变得更加容易。

关键词: 玉米秸秆, 改性, 氨氮, 吸附

CLC Number: 

• X703.1