Valderrama C, Cortina J L, Farran A, Gamisans X, Lao C
Mining Engineering and Natural Resources Department, EPSEM, Universitat Politenica de Catalunya, 08240 Manresa, Spain.
J Colloid Interface Sci. 2007 Jun 1;310(1):35-46. doi: 10.1016/j.jcis.2007.01.039. Epub 2007 Mar 23.
Polymeric supports are presented as an alternative to granular activated carbon (GAC) for organic contaminant removal from groundwater using permeable reactive barriers (PRB). The search for suitable polymeric sorbents for hydrocarbon extraction from aqueous streams has prompted the synthesis of new resins incorporating new functionalities or modifying the polymer network properties that solve many of the existing problems. Between them, the new type of polymeric sorbents Macronet Hypersol containing a styrene-divinylbenzene macroporous hyperreticulated network has been evaluated. Because of their potential sorptive properties, tests were conducted to determine the feasibility of using them as a low-cost reactive material for groundwater applications. The present work describes the sorption of six polycyclic hydrocarbons (PAHs) from aqueous solution onto both Macronet polymeric sorbent MN200 and granular activated carbon. Batch experiments were performed to determine loading rates of a family of PAHs (naphthalene, fluorene, anthracene, acenaphthene, pyrene, and fluoranthene), from a simple two-rings PAH (naphthalene) up to a four-ring PAH (pyrene). The behavior of a non-functionalized Macronet support (MN200) was compared with the behavior of a recognized material, granular activated carbon (GAC). Analyses of the respective rate data with three theoretical models (pseudo-first- and pseudo-second-order reaction models and the Elovich model) were used to describe the PAH sorption kinetics. Sorption rate constants were determined by graphical analysis of the proposed models. The study showed that sorption systems followed a pseudo-first-order reaction model, although the pseudo-second-order reaction model provides an acceptable description of the sorption process. Graphical analysis showed that the sorption process with activated carbon is a more complex process than the one observed for hyper-cross-linked polymers (MN200). A simulation of the barrier thickness needed to treat a PAH-polluted plume showed that 0.1-1 m of sorption media is enough even for high water fluxes such as 0.1-2 m(3)/m(2)/day for both sorbents.
聚合物载体被提出作为粒状活性炭（GAC）的替代品，用于通过渗透反应墙（PRB）从地下水中去除有机污染物。寻找适合从水流中提取碳氢化合物的聚合物吸附剂促使人们合成了具有新功能或改变聚合物网络性质的新型树脂，这些新树脂解决了许多现有问题。其中，对含有苯乙烯 - 二乙烯基苯大孔高交联网络的新型聚合物吸附剂Macronet Hypersol进行了评估。由于其潜在的吸附性能，开展了测试以确定将它们用作地下水应用低成本反应材料的可行性。本研究描述了六种多环芳烃（PAHs）从水溶液中吸附到Macronet聚合物吸附剂MN200和粒状活性炭上的情况。进行了批量实验，以确定一系列PAHs（萘、芴、蒽、苊、芘和荧蒽）的负载率，从简单的二环PAH（萘）到四环PAH（芘）。将未官能化的Macronet载体（MN200）的行为与公认材料粒状活性炭（GAC）的行为进行了比较。用三种理论模型（伪一级和伪二级反应模型以及Elovich模型）对各自的速率数据进行分析，以描述PAH的吸附动力学。通过对所提出模型的图形分析确定吸附速率常数。研究表明，吸附系统遵循伪一级反应模型，尽管伪二级反应模型对吸附过程也提供了可接受的描述。图形分析表明，活性炭的吸附过程比超交联聚合物（MN200）所观察到的过程更复杂。对处理PAH污染羽流所需的屏障厚度进行的模拟表明，即使对于高达0.1 - 2 m³/m²/天的高水流通量，0.1 - 1 m的吸附介质对两种吸附剂来说都足够了。
