摘要
以城市污水处理厂干活性污泥为吸附剂对染料直接深棕M、酸性媒介棕RH进行了吸附研究,结果表明,吸附过程能很好地用二级速率表达式表示,同时也可用Lagergren一级速率方程描述。其一级吸附速率常数k1分别为0.0204min-1和0.0068min-1,二级吸附速率常数k2分别为0.00592和0.00589gmg-1min-1。两者的吸附特性不同,其吸附等温线前者符合Freundlich方程,后者既符合Freundlich方程也符合Langmuir方程。吸附平衡时间、去除率亦不同,前者明显大于后者,达到吸附平衡的时间分别为120min和240min。两种染料的正辛醇/水分配系数logP计算数值分别为4.65和-0.22,这一顺序与两种染料在干污泥上的吸附行为相符。
In this study, two kinds of dyes Direct Dark Brown M and Acid Mordant Brown RH were used with dried activated sludge as the adsorbent. The experimental results indicated that the adsorption process followed the second-order kinetic model and at the same time can be described by the first-order rate expression of Lagergren. The adsorption isotherms of Acid Mordant Brown RH fit Freundlich equation and that of Acid Mordant Brown RH followed both Freundlich equation and Langmuir equation. The octanol/water partitioning coefficient log P for both dyes calculated using fragment constant method were 4.65 and 0.22 respectively, indicating the conformity with the adsorption of two kinds of dyes onto dried activated sludge.
出处
《环境科学与技术》
CAS
CSCD
2004年第1期1-2,29,共3页
Environmental Science & Technology
基金
国家自然科学基金项目(29877014)
教育部南开大学-天津大学联合研究项目(AJ0013)
关键词
干活性污泥
吸附
染料
正辛醇/水分配系数
dried activated sludge
adsorption
dyes
octanol/water partitioning coefficient
