水滑石焙烧产物对阴离子染料萘酚绿B的吸附动力学试验  

Experiment of Adsorption Kinetics of Anionic Dye naphthol green B by Calcined MgAl-Hydrotalcite

作　　者：吴素花 李耀中 李霞 

机构地区：[1]凯米拉(上海)管理有限公司,上海201112

出　　处：《净水技术》2015年第2期47-51,共5页Water Purification Technology

摘　　要：研究了水滑石焙烧产物对萘酚绿B溶液的吸附动力学,考察了苯酚初始浓度和吸附剂投加量对吸附的影响,并用动力学模型进行了拟合。结果表明水滑石焙烧产物对萘酚绿B的吸附动力学过程可以用准二级模型进行描述。吸附平衡容量随着萘酚绿B初始浓度的增加、吸附剂投加量的降低而增加,而吸附速率随着萘酚绿B浓度的增加、吸附剂投加量的增加而降低。水滑石焙烧产物对萘酚绿B的吸附平衡遵循Langmuir等温线模型。颗粒内扩散模型分析表明水滑石焙烧产物在萘酚绿B溶液的吸附过程中,颗粒内扩散不是唯一的速率控制步骤。The adsorption kinetics of naphthol green B by calcined MgAl-hydrotalcite was investigated in this paper. The effect of initial dye concentration and adsorbent dosage was studied and several kinetics models were applied to fit the experimental results. The results show that the pseudo-second-order kinetics model can fit the result best. The adsorption equilibrium capacity increases with the increase of initial dye concentration and with the decrease of adsorbent dosage, while the rate constant responds inversely. The adsorption equilibrium of naphthol green B by calcined MgAl-hydrotalcite follows the Langmuir model. Intraparticle diffusion is not the only operative mechanism for this system.

关 键 词：阴离子染料 MgAl-水滑石 焙烧 萘酚绿B 吸附动力学 试验 

分 类 号：X703[环境科学与工程—环境工程]