水溶液中新生态MnO_2对苯酚的吸附作用  

Adsorption of phenol by MnO_2 formed in situ

作　　者：张立珠[1] 马军[1] 陈忠林[1] 余敏[1] 

机构地区：[1]哈尔滨工业大学市政环境工程学院

出　　处：《化工学报》2006年第12期2959-2963,共5页CIESC Journal

基　　金：哈尔滨市青年科学基金项目(2005AFQXJ053)

摘　　要：研究了新生态MnO2对水溶液中苯酚的吸附作用．对一些影响因素，如pH、高价正离子Al^3＋和高价负离子PO^3- 4进行了考察。并探讨了反应机理．实验结果表明，新生态MnO2对苯酚的吸附等温线为“S”形，对苯酚的吸附过程包括表面吸附和孔内扩散两部分．pH在6～9的范围内，随pH升高苯酚吸附量下降，但变化不大;当pH≥10时，苯酚去除率几乎降为零．少量铝离子有利于苯酚的吸附．因为铝离子吸附在新生态MnO2表面，改变了新生态MnO2的表面性质，有利于苯酚的吸附．磷酸根离子极易与苯酚络合而带负电荷，不利于新生态MnO2对苯酚的吸附．The effects of pH, Al^3＋ and PO^3- 4 on the adsorption of phenol by MnO2 formed in situ were studied in aqueous solution. The behavior and adsorption mechanism were investigated. The adsorption isotherm was of ＂S＂ shape. The adsorption process of phenol on MnO2 formed in situ was divided into adsorption on the external surface of MnO2 formed in situ and diffusion to the interior of MnO2. Phenol adsorption capacity decreased slightly with increasing pH in the range of 6-9, but declined to nearly zero at pH≥10. The presence of a small amount of aluminum ion adsorbed onto the oxide surface changed the surface characteristics, which promoted the adsorption of phenol. Phosphate inhibited the adsorption of phenol by forming a negatively charged complex with phenol.

关 键 词：新生态MNO2 苯酚 吸附 

分 类 号：X703.1[环境科学与工程—环境工程]