摘要
用纯度较高黄腐酸考察其对铬吸附机理,考察了吸附时间、pH值、温度等对黄腐酸吸附Cr6+过程的影响。结果表明,pH>6.5,黄腐酸对Cr6+吸附量较大,且基本稳定;pH=7,吸附量随时间的增大而增大,400 min达吸附平衡。研究吸附等温线表明,黄腐酸对Cr6+的吸附为吸热过程,且符合Langmiur和Freundlich吸附等温模型。采用Van’tHoff方程拟合,表明黄腐酸对Cr6+的吸附以物理吸附为主,吸附热ΔH为21.805 1 kJ.mol-1,ΔG<0,吸附具有自发性,ΔS>0,吸附为熵推动过程。
In this paper, the pure fulvic acid was used to study the adsorption mechanism of Fe^3＋ . Meanwhile, the effects of pH, temperature, the amount of FA on absorption behavior was also investigated. The result pH〉 6.5, adsorption is larger and stable, pH = 7, the amount of absorption become bigger with the longer time, and about 400 minutes the adsorption balance can be obtained. From the adsorption isotherms curve, we can find that the adsorption of Cr^6＋ on fulvic acid is an endothermic program and also in accord with the Langmiur and Freundlich adsorption isotherms model. Calculate with the Van＇tHoff equation, The physical adsorption is the main adsorption, and the adsorption caloric△H is 21. 805 1 kJ·mol^-1, △G〈 0, adsorption is spontaneous, △S〉 0, entrpy impel the adsorption.
出处
《有色矿冶》
2007年第6期46-48,共3页
Non-Ferrous Mining and Metallurgy
关键词
黄腐酸
吸附
吸附动力学
等温吸附
fulvic acid
adsorption
adsorption isotherms
adsorption dynamics
