Study on Adsorption Characteristics and Mechanism of Modified g-Al₂O₃

Hao Cunjiang
(Department of Chemistry, Anyang Teacher's Cellege, Henan Anyang 455000)

Abstract The surface characteristics of g-Al₂O₃ modified by triethanolamine is determined by IR spectrum, the measurement of organic carbon content and specific surface area. The adsorption behavior of g-Al₂O₃ to p-dihydroxybenzene and phenol is studied and the adsorption amount-time curve is simulated with shrinkage unreacted core model. Based on the adsorption amount-time curve and the isothermal adsorption curve, the optimum adsorption condition, properties and mechanism are explored. The results show that the content of organic carbon in g-Al₂O₃ is relative to adsorption amount, and the adsorption process may be controlled by ash layer diffusion step.
Key words Modified g-Al₂O₃, Adsorption mechanism, Phenol, p-Dihydroxybenzene

改性g-Al₂O₃的吸附性能及机理研究

摘 要 用三乙醇胺(TEA)制备了改性g-Al₂O₃，通过红外光谱、有机碳含量测定、比表面积测定，对改性g-Al₂O₃的表面性质进行了表征；借用收缩未反应核模型动力学方程对改性g-Al₂O₃吸附对苯二酚、苯酚的吸附量-时间曲线在达到平衡之前进行了分析，结合pH-吸附量曲线、等温吸附曲线，探讨了g-Al₂O₃吸附水溶液中对苯二酚、苯酚的适宜条件、性能及机理。结果表明：改性g-Al₂O₃有机碳含量与吸附量呈正相关，吸附过程可能是灰层扩散控制。
关键词 改性g-Al₂O₃ 吸附机理 苯酚 对苯二酚

郝存江 男，40岁，硕士，教授，主要从事表面物理化学研究。E-mail: hcj63@sohu.com
河南省安阳市科技攻关资助项目，安阳师范学院重点学科资助项目
2003-10-14收稿，2004-03-25接受

(PDF全文下载c04085)