Department of Chemical Engineering, University of Louisiana at Lafayette, P. O. Box 43675, Lafayette, LA, 70504, USA.
Department of Civil Engineering, University of Louisiana at Lafayette, P. O. Box 43598, Lafayette, LA, 70504, USA.
J Hazard Mater. 2017 Aug 15;336:249-259. doi: 10.1016/j.jhazmat.2017.04.073. Epub 2017 May 1.
Chemical and petrochemical industries produce substantial amounts of wastewater everyday. This wastewater contains organic pollutants such as benzene, toluene, ethylbenzene and xylenes (BTEX) that are toxic to human and aquatic life. Ordered Mesoporous Carbon (OMC), the adsorbent that possesses the characteristics of an ideal adsorbent was investigated to understand its properties and suitability for BTEX removal. Adsorption isotherms, adsorption kinetics, the effects of initial BTEX concentrations and temperatures on the adsorption process were studied. The OMCs were characterized using surface area and pore size analyzer, transmission electron microscopy (TEM), elemental analysis, thermogravimetric analysis (TGA) and fourier transform infrared spectroscopy (FTIR). The results suggested that the Langmuir Isotherm and Pseudo-Second-Order Models described the experimental data well. The thermodynamic parameters, Gibbs free energy (ΔG°), the enthalpy change (ΔH°) and the entropy change (ΔS°) of adsorption indicated that the adsorption processes were physical, endothermic, and spontaneous. In addition, OMC had 27% higher overall adsorption capacities compared to granular activated carbon (GAC).
化工行业每天都会产生大量的废水。这些废水中含有苯、甲苯、乙苯和二甲苯（BTEX）等有机污染物，对人类和水生生物都具有毒性。有序介孔碳（OMC）是一种具有理想吸附剂特性的吸附剂，本研究旨在探究其去除 BTEX 的性能和适用性。研究了吸附等温线、吸附动力学、初始 BTEX 浓度和温度对吸附过程的影响。采用比表面积和孔径分析仪、透射电子显微镜（TEM）、元素分析、热重分析（TGA）和傅里叶变换红外光谱（FTIR）对 OMC 进行了表征。结果表明，Langmuir 等温线和准二级动力学模型很好地描述了实验数据。吸附的热力学参数，吉布斯自由能（ΔG°）、焓变（ΔH°）和熵变（ΔS°）表明吸附过程是物理的、吸热的和自发的。此外，与颗粒状活性炭（GAC）相比，OMC 的总吸附容量高 27%。
