Technical University of Crete, Department of Environmental Engineering, Laboratory of Toxic and Hazardous Waste Management, University Campus, P.C. 73100, Chania, Crete, Greece.
J Hazard Mater. 2012 Mar 15;207-208:136-46. doi: 10.1016/j.jhazmat.2011.04.084. Epub 2011 Apr 23.
The removal of BTEX (benzene, toluene, ethyl-benzene and m-,p-,o-xylenes), MTBE (methyl tertiary butyl ether) and TAME (tertiary amyl methyl ether) from aqueous solutions by raw (L(raw)) and thermally treated lignite at 250 C, 550 °C and 750 °C (L250, L550 and L750, respectively) was studied, through batch experiments. Selected physical characteristics of both raw and treated lignite such as surface area and pore volume distribution were determined. Competitive adsorption effects were also explored. It was proved that the examined lignite samples were quite effective in removing BTEX, MTBE and TAME from aqueous solutions, with sample treated at 750 °C being the most effective. Among the contaminants, BTEX appeared to have the strongest affinity, based on mass uptake by lignite samples. BTEX presence was found to significantly prevent MTBE and TAME adsorption on lignite (up to ∼55%). In all cases, equilibrium was achieved within 3h. The kinetics data proved a closer fit to the pseudo second order model, while the isotherm experimental data were a better fit to the Freundlich model, producing in some cases values of the isotherm constant 1/n less than one, indicating favorable adsorption. Respective batch experiments using commercial activated carbon (AC) were also conducted for comparison.
通过批量实验研究了未经处理（L（raw））和在 250°C、550°C 和 750°C 下热处理的褐煤（L250、L550 和 L750）从水溶液中去除 BTEX（苯、甲苯、乙苯和 m、p、o-二甲苯）、MTBE（甲基叔丁基醚）和 TAME（叔戊基甲基醚）的情况。测定了原始和处理过的褐煤的一些物理特性，如表面积和孔径分布。还探索了竞争吸附效应。结果证明，所研究的褐煤样品对从水溶液中去除 BTEX、MTBE 和 TAME 非常有效，在 750°C 下处理的样品效果最佳。在所有污染物中，BTEX 似乎对褐煤的吸附亲和力最强，根据褐煤样品的质量吸收量来判断。BTEX 的存在明显阻止了 MTBE 和 TAME 在褐煤上的吸附（高达约 55%）。在所有情况下，3 小时内达到平衡。动力学数据更符合拟二级模型，而等温实验数据更符合 Freundlich 模型，在某些情况下，等温常数 1/n 的值小于 1，表明吸附有利。还进行了使用商业活性炭（AC）的相应批量实验进行比较。
