Citation: ZHAO Ling-Xi, SONG Shu-E, DU Na, HOU Wan-Guo. A Sorbent Concentration-Dependent Langmuir Isotherm[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201209251 shu

A Sorbent Concentration-Dependent Langmuir Isotherm

ZHAO Ling-Xi ¹ ,
SONG Shu-E ² ,
DU Na ² ,
HOU Wan-Guo ^2,3,

1.
1 Environment Research Institute, Shandong University, Jinan 250100, P. R. China;
2 Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, P. R. China;
3 State Key Laboratory Base of Eco-Chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong Province, P. R. China

Received Date: 25 May 2012
Available Online: 25 September 2012
Fund Project: 国家自然科学基金(21173135) (21173135) 高等学校博士学科点专项科研基金(20110131130008) (20110131130008) 山东省泰山学者基金(ts20070713) (ts20070713)山东大学研究生自主创新基金(yzc10112)资助项目 (yzc10112)

Batch adsorption experiments of Pb(II) and Cu(II) on kaolinite as a function of kaolinite concentration were conducted. An obvious sorbent concentration effect (C_s-effect) was observed; namely, the adsorption isotherm declines as sorbent concentration (C_s) increases. The experimental data were fitted to the classic Langmuir model. The results showed that the classic Langmuir model could adequately describe the adsorption equilibria of Pb(II) and Cu(II) on kaolinite for a given C_s value, but could not adequately predict the Cs-effect observed in the adsorption systems. We proposed a surface component activity (SCA) model. It suggests that the interactions between the sorbent particles exist in the real adsorption system, and the activity coefficient of the adsorption sites of the sorbent surface is a function of C_s. Based on the SCA model, a C_s-dependent Langmuir (Langmuir-SCA) isotherm was derived. The applicability of the Langmuir-SCA isotherm was examined with the experimental adsorption data of Pb(II) and Cu(II) on kaolinite, as well as Cd(II) and Zn(II) on vermiculite and Pb(II) on coffee reported in the literature. The results showed that the Langmuir-SCA equation could describe the C_s-effect observed in adsorption experiments. The two intrinsic parameters of the Langmuir-SCA isotherm, the thermodynamic equilibrium constant (K_eq) and the characteristic saturation adsorption capacity (Γ_m⁰), are independent of C_s and can be simulated with experimental adsorption data.
- Adsorption,
- Sorbent concentration effect,
- Langmuir equation,
- Pb(II),
- Cu(II)
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