Department of Engineering, University of Cambridge, Cambridge, CB2 1PZ, United Kingdom.
School of Engineering, University of Glasgow, G128QQ, United Kingdom.
J Hazard Mater. 2018 Apr 5;347:461-469. doi: 10.1016/j.jhazmat.2018.01.007. Epub 2018 Jan 10.
The intensive use of methyl tert-butyl ether (MTBE) as a gasoline additive has resulted in serious environmental problems due to its high solubility, volatility and recalcitrance. The feasibility of permeable reactive barriers (PRBs) with ZSM-5 type zeolite as a reactive medium was explored for MTBE contaminated groundwater remediation. Batch adsorption studies showed that the MTBE adsorption onto ZSM-5 follows the Langmuir model and obeys the pseudo-second-order model with an adsorption capacity of 53.55 mg g. The adsorption process reached equilibrium within 24 h, and MTBE was barely desorbed with initial MTBE concentration of 300 mg L. The mass transfer process is found to be primarily controlled by pore diffusion for MTBE concentrations from 100 to 600 mg L. pH has little effect on the maximum adsorption capacity in the pH range of 2-10, while the presence of nickel reduces the capacity with Ni concentrations of 2.5-25 mg L. In fixed-bed column tests, the Dose-Response model fits the breakthrough curve well, showing a saturation time of ∼320 min and a removal capacity of ∼18.71 mg g under the conditions of this study. Therefore, ZSM-5 is an extremely effective adsorbent for MTBE removal and has a huge potential to be used as a reactive medium in PRBs.
甲基叔丁基醚（MTBE）作为一种汽油添加剂被大量使用，导致其高溶解度、挥发性和难降解性引发了严重的环境问题。本研究探索了以 ZSM-5 型沸石作为反应介质的可渗透反应屏障（PRB）修复 MTBE 污染地下水的可行性。批吸附实验表明，ZSM-5 对 MTBE 的吸附符合 Langmuir 模型和准二级动力学模型，吸附容量为 53.55mg/g。吸附过程在 24h 内达到平衡，初始 MTBE 浓度为 300mg/L 时 MTBE 几乎不被解吸。对于 100-600mg/L 的 MTBE 浓度，质量传递过程主要受孔扩散控制。pH 值在 2-10 范围内对最大吸附容量影响不大，而镍的存在会降低吸附容量，镍浓度为 2.5-25mg/L。在固定床柱试验中，剂量-响应模型很好地拟合了穿透曲线，在本研究条件下，饱和时间约为 320min，去除容量约为 18.71mg/g。因此，ZSM-5 是一种去除 MTBE 的高效吸附剂，具有在 PRB 中作为反应介质的巨大潜力。
