Nowack Kirk O, Cannon Fred S, Mazyck David W
Department of Civil and Environmental Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
Environ Sci Technol. 2004 Jan 1;38(1):276-84. doi: 10.1021/es026397j.
This research investigated methods for tailoring a commercial, lignite-based granular activated carbon (GAC) to enhance its adsorption of 2-methylisoborneol (MIB) from natural water. Tailoring efforts focused on heat treatments in gas environments comprising steam and/or methane, since these gases can alter GAC pore structure and surface chemistry. Heat treatments that combined methane and steam enhanced MIB adsorption considerably, causing a 4-fold improvement (over untreated GAC) in fixed-bed adsorption performance relative to initial MIB breakthrough. These favorable effects, observed in rapid small-scale column tests, occurred following simultaneous and separate (sequential) applications of methane and steam. Moderately low temperature steam treatments also improved MIB uptake in fixed-bed adsorption tests but to a lesser extent (approximately 1.5-fold). In contrast, methane treatments alone, at various temperatures, led to significant carbon deposition within the GAC pore structure. As a result, total pore volume was reduced and MIB adsorption performance declined.
本研究探讨了定制一种商用褐煤基颗粒活性炭（GAC）以增强其从天然水中吸附2-甲基异冰片（MIB）的方法。定制工作重点是在包含蒸汽和/或甲烷的气体环境中进行热处理，因为这些气体可改变GAC的孔隙结构和表面化学性质。将甲烷和蒸汽相结合的热处理显著增强了MIB的吸附，相对于初始MIB穿透，固定床吸附性能提高了4倍（相对于未处理的GAC）。在快速小规模柱试验中观察到的这些有利效果，是在同时和分别（相继）应用甲烷和蒸汽之后出现的。适度低温的蒸汽处理在固定床吸附试验中也提高了MIB的吸附量，但程度较小（约1.5倍）。相比之下，在不同温度下单独进行甲烷处理会导致GAC孔隙结构内大量积碳。结果，总孔体积减小，MIB吸附性能下降。
