Efficacy of Carbonaceous Materials for Sorbing Polychlorinated Biphenyls from Aqueous Solution
Efficacy of Carbonaceous Materials for Sorbing Polychlorinated Biphenyls from Aqueous Solution
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DOI：
10.1021/es502647n
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发表时间：
2014-09-02
影响因子：
11.4
通讯作者：
Rodrigues, Debora F.
中科院分区：
文献类型：
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作者：
Beless, Bradley;Rifai, Hanadi S.;Rodrigues, Debora F.
将纳米材料纳入水处理技术的兴趣正在稳步增长，推动了了解这些新材料与特定水污染物相互作用的必要性。在本研究中，五种不同的碳质材料：活性炭（AC），木炭（BC），碳纳米管（CNT），石墨烯（GE），和氧化石墨烯（GO）作为吸附剂材料的11多氯联苯（PCB）同系物在水溶液中的浓度在pg-μ g/L范围内进行了研究。以纳克/升水溶液浓度计算的吸附剂-水分配系数（K-S）表明，AC上级GE，GO，CNT和BC的11个PCB同系物调查的平均值分别为1.1，1.1，1.3和2.5个数量级。此外，从Langmuir，Freundlich和Polanyi-Dubinin-Manes（PDM）模型的最大容量和吸附亲和力参数显示了类似的结果。然而，有趣的是，分子平面性的影响对PCB吸附到纳米材料上有更大的影响，使得平面同系物与CNT、GE和GO形成比AC和BC更强的键。这项工作表明，与所研究的纳米材料相比，AC对PCB的吸附性能上级，因此，需要对纳米材料进行大量的生产后修改，以使其性能优于AC。
Interest in incorporating nanomaterials into water treatment technologies is steadily growing, driving the necessity to understand the interaction of these new materials with specific water contaminants. In the present study, five different carbonaceous materials: activated carbon (AC), charcoal (BC), carbon nanotubes (CNT), graphene (GE), and graphene oxide (GO) were investigated as sorbent materials for 11 polychlorinated biphenyl (PCB) congeners in aqueous concentrations in the pg-mu g/L range. Sorbent-water distribution coefficients (K-s) calculated in aqueous concentrations of ng/L show that AC is superior to GE, GO, CNT, and BC for the 11 PCB congeners investigated by an average of 1.1, 1.1, 1.3, and 2.5 orders of magnitude, respectively. Additionally, maximum capacity and sorption affinity parameters from the Langmuir, Freundlich, and Polanyi-Dubinin-Manes (PDM) models show a similar result. Interestingly, however, the effect of molecular planarity has greater impact on PCB sorption to the nanomaterials, such that the planar congeners form stronger bonds with CNT, GE, and GO compared to AC and BC. This work demonstrated superior PCB sorption by AC as compared with the nanomaterials examined such that substantial post production modifications would be necessary for the nanomaterials to out-perform AC.