Lorimier C, Subrenat A, Le Coq L, Le Cloirec P
Ecole des Mines de Nantes, GEPEA, UMR CNRS 6144, 4 rue A. Kastler, BP 20 722, 44 307 Nantes 3, France.
Environ Technol. 2005 Nov;26(11):1217-30. doi: 10.1080/09593332608618600.
Due to their bad effects on human health, removing Volatile Organic Compounds from indoor air has become an issue of major interest. In this study, the potential use of six commercial activated carbon felts and cloths for indoor toluene removal was investigated. Both batch and dynamic adsorption studies were performed, at toluene concentrations ranging from 21 to 18160 mg m(-3), for an air velocity representative of indoor air treatment (0.37 m s(-1)). Batch measurements showed that felts exhibited higher adsorption capacities at equilibrium than cloths at high toluene concentrations, whereas this trend may be inverted at low concentrations. Experimental isotherms and kinetics were satisfactorily fitted by the Langmuir-Freundlich model and the Linear Driving Force model respectively. No main differences between the adsorption kinetics of felts and cloths were reported. Dynamic adsorption capacities at saturation appeared to be higher than 120 mg g(-1) for both cloths and felts, irrespective of relative humidity levels and toluene concentrations. The influence of relative humidity on the adsorption capacity of felts was not significant for the higher toluene concentration studied in dynamics (307 mg m(-3)), whereas an increase in relative humidity induced a decrease in adsorption capacity at the lower toluene concentration (38 mg m(-3)). Moreover, experimental curves of breakthrough time versus thickness of medium were satisfactorily fitted by the Adams-Bohart model, and the critical thickness determined by this model appeared to be below 1.3 mm, regardless of the medium or toluene concentration.
由于挥发性有机化合物对人体健康有不良影响，从室内空气中去除挥发性有机化合物已成为一个备受关注的问题。在本研究中，研究了六种商用活性炭毡和布用于去除室内甲苯的潜在用途。进行了间歇吸附和动态吸附研究，甲苯浓度范围为21至18160 mg m(-3)，空气流速代表室内空气处理（0.37 m s(-1)）。间歇测量表明，在高甲苯浓度下，毡在平衡时表现出比布更高的吸附容量，而在低浓度下这种趋势可能会反转。实验等温线和动力学分别用Langmuir-Freundlich模型和线性驱动力模型进行了满意的拟合。未报告毡和布的吸附动力学之间存在主要差异。无论相对湿度水平和甲苯浓度如何，布和毡的饱和动态吸附容量似乎都高于120 mg g(-1)。对于动力学研究中的较高甲苯浓度（307 mg m(-3)），相对湿度对毡吸附容量的影响不显著，而在较低甲苯浓度（38 mg m(-3)）下，相对湿度的增加导致吸附容量下降。此外，穿透时间与介质厚度的实验曲线用Adams-Bohart模型进行了满意的拟合，该模型确定的临界厚度似乎低于1.3 mm，与介质或甲苯浓度无关。
