吸附剂类型对不同种类废水净化 效果的影响.docVIP

  吸附剂类型对不同种类废水净化 效果的影响# 戴敏，李锋民，彭昌盛** 5 10 15 20 （中国海洋大学环境科学与工程学院 海洋环境与生态教育部重点实验室，青岛 266100） 摘要：通过静态吸附试验，分别研究粉状活性炭、Na-A 分子筛、阳离子树脂和壳聚糖等 4 种吸附剂，对含有酸性橙 7 的染料废水、含邻苯二甲酸氢钾的有机废水和含 Cu2+的重金属 废水等 3 种废水的吸附效果。试验结果表明，吸附剂对污染物有选择吸附性。在对酸性橙 7 的吸附试验中，粉状活性炭的吸附量200mg·g-1，远高于其他三种吸附剂，壳聚糖次之， 吸附量20 mg·g-1，阳离子树脂不发生吸附作用；在对 Cu2+的吸附试验中，壳聚糖的吸附 量190mg·g-1，其次分别是阳离子树脂，吸附量在 140 mg·g-1 左右，粉状活性炭，吸附 量在 110 mg·g-1 左右，Na-A 分子筛，吸附量20 mg1·g-1；在对邻苯二甲酸氢的吸附试 验中，仅壳聚糖发生了吸附作用。在吸附等温线拟合中，Freundlich 等温方程能更好地拟合 壳聚糖对邻苯二甲酸氢钾的吸附，其他试验数据适用 Langmuir 等温方程。所有的吸附过程 都符合准二级吸附动力学模型。 关键词：吸附；吸附剂；废水类型；吸附等温线；吸附动力学 中图分类号：X502 PURIFICATION OF DIFFERENT ADSORBENTS FOR DIFFERENT TYPES OF WASTEWATER DAI Min, LI Fengmin, PENG Changsheng (Key Lab of Marine Environmental Science and Ecology of the Ministry of Education, College of Environmental Science and Engineering, Ocean University of China, Qingdao, 266100) 25 Abstract: In this paper, to investigate the adsorption mechanism and effection , activated carbon, Na-A zeolite ,cation resin and chitosan are used to adsorb Acid Orange 7, potassium hydrogen phthalate and Cu2+ in water. Results demonstrate that activated carbon is suitable to adsorb Acid Orange 7 and the adsorption capacity reaches more than 200mg·g-1. The second is chitosan and its adsorption capacity is less than 20 mg·g-1. In adsorption of Cu2+, chitosan is the best and the 30 35 40 adsorption capacity is more than 190mg· g-1. And only chitosan can adsorb potassium hydrogen phthalate. Accumulation of Cu2+ and Acid Orange 7 by adsorbents all follow Langmuir adsorption isotherm better than Freundlich adsorption isotherm. But adsorption of potassium hydrogen phthalate by chitosan follow Freundlich adsorption isotherm. The sorption kinetics` studies show that the pseudo-second-order model is more suitable to describe the sorption process than the pseudo-first-order model for all four kinds of adsorbents. Key words: adsorption; adsorbent; type of sewage; adsorption isotherms; adsorption kinetics 0 引言 近年来，经济的发展导致污水排放量逐年