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›› 2017, Vol. 17 ›› Issue (1): 103-109.DOI: 10.12034/j.issn.1009-606X.216158

• 过程与工艺 • 上一篇    下一篇

复合改性沸石颗粒氨氮吸附过程及特征

杨炳飞,林海,董颖博,王亮   

  1. 北京科技大学土木与环境工程学院
  • 收稿日期:2016-03-18 修回日期:2016-08-18 出版日期:2017-02-20 发布日期:2017-02-22
  • 通讯作者: 杨炳飞

Ammonia?Nitrogen Adsorption Process and Characteristic of Compound Modification Zeolite Granules

YANG Bing-fei 1,LEI Jian-du 2,DONG Ying-bo 2,WANG Liang 2   

  1. 1. School of Civil and Environmental Engineering, University of Science and Technology Beijing
    2. Environmental Engineering Department, University of Science and Technology Beijing
  • Received:2016-03-18 Revised:2016-08-18 Online:2017-02-20 Published:2017-02-22
  • Contact: YANG Bing-fei

摘要: 以碱液预处理、盐热复合改性及人工成型后的沸石颗粒(Φ1.50 mm×2.50 mm)为研究对象,研究了其吸附模拟水样中氨氮的行为,考察了不同条件下沸石颗粒的等温吸附平衡、吸附反应动力学特征、吸附反应速度控制及热力学过程. 结果表明,在pH=7.00、反应温度298 K时,Langmuir方程能很好地描述沸石颗粒吸附氨氮过程,拟合方程和相关系数分别为y=0.0084x+0.2857和R2=0.9936;用准二级反应动力学方程描述吸附氨氮反应动力学较准确,拟合方程和相关系数分别为y=0.3401x+8.9684和R2=0.9993;沸石颗粒吸附氨氮过程受液膜扩散控制(y=0.0172x, R2=0.9809),60 min后还受内扩散控制(y=0.0869x+1.4917, R2=0.9798). 吸附可自发进行,为吸热过程,温度升高吸附速率加快,吸附量增加. 熵效应是吸附的主要驱动力.

关键词: 复合改性, 沸石, 氨氮, 吸附, 动力学, 热力学, 速度控制

Abstract: Ammonia-nitrogen adsorption process and characteristic were studied on the compound modification zeolite granules, which were made by zeolite power and modified by NaOH solution, NaCl solution and roasting successively before granulation, and with the size of Φ1.50 mm×2.50 mm. Isothermal equilibrium adsorption, adsorption kinetics characteristic,adsorption rate control steps and adsorption thermodynamics were main investigated in different conditions respectively. The results showed when PH value was equal to 7.00 and adsorption temperature was 298 K, ammonia-nitrogen adsorption process of the zeolite granules conform to Langmuir adsorption isotherm, the fitted equation was y=0.0084x+0.2857 and the correlation coefficient (R2) was 0.9936. Pseudo?second order reaction kinetics equation can describe the adsorption kinetics characteristics and the fitted equation was y=0.3401x+8.9684 and the correlation coefficient (R2) was 0.9993. Beside, the ammonia-nitrogen adsorption process was mainly controlled by film diffusion (y=0.0172x, R2=0.9809) in whole process and controlled by which and intra-particle diffusion process (y=0.0869x+1.4917, R2=0.9798) in 60 min later together. In addition, adsorption thermodynamics showed that ammonia?nitrogen adsorption process of the zeolite granules belong to spontaneous process, adsorption rate quicken with temperature rising. The adsorption process also belong to endothermic process, adsorption capacity increase with temperature rising. Entropy effect was the main driver of the adsorption process.

Key words: compound modification, zeolite, ammonia nitrogen, adsorption, kinetics, thermodynamics, velocity control