摘要
采用振荡吸附法研究黄腐酸对铁的吸附行为,分别考察了时间、pH值,温度等对黄腐酸吸附Fe^3+过程的影响.结果表明,pH=4.5~6.5,吸附量较大,且基本稳定,不随pH值的变化而变化;pH=5,200min达到吸附平衡;pH=3,Fe^3+易从黄腐酸上解吸下来,180min可达到解吸平衡.从吸附等温线可看出,黄腐酸对Fe^3+的吸附符合Langmiur和Freundlich吸附等温模型;吸附为吸热过程,吸附热△H为8.0091kJ·mol^-1.
The virbrating adsorption method is used to study the adsorption mechanism of Fe^3+. Meanwhile, the effects of time, pH and temperature are also investigated. The result shows that, when pH = 4.5 - 6.5, adsorption is larger and stable and does not vary with the variable pH. When pH = 5, the amount of absorption becomes bigger with the longer time, and through about 200 minutes the adsorption balance can be obtained. When pH = 3, Fe^3+ can be easily desorbed from FA, and through about 180 minutes the desorption balance can be obtained. From the isothermal adsorption curve, we can find that the adsorption of Fe^3+ on fulvic acid is an endothermic process and also in coincidence with the Langmiur and Freundlich adsorption isotherms model. The adsorption caloric△H is 8.009 1 kJ · mol^-1.
出处
《沈阳理工大学学报》
CAS
2007年第6期70-73,共4页
Journal of Shenyang Ligong University
关键词
黄腐酸
吸附
吸附动力学
等温吸附
fulvic acid
adsorption
adsorption dynamics
isothermal adsorption