Polypyrrole-Grafted Coconut Shell Biological Carbon as a Potential Adsorbent for Methyl Tert-Butyl Ether Removal: Characterization and Adsorption Capability.
Polypyrrole-Grafted Coconut Shell Biological Carbon as a Potential Adsorbent for Methyl Tert-Butyl Ether Removal: Characterization and Adsorption Capability.
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聚吡咯接枝椰壳生物碳作为去除甲基叔丁基醚的潜在吸附剂：表征和吸附能力
DOI：
10.3390/ijerph14020113
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发表时间：
2017-01-24
影响因子：
--
通讯作者：
Yan W
中科院分区：
文献类型：
--
作者：
Li S;Qian K;Wang S;Liang K;Yan W
自世纪后期以来，甲基叔丁基醚（MTBE）已在世界范围内被用作常见的汽油添加剂，并且已成为许多国家最常检测到的地下水污染物。本研究旨在合成一种新型的微生物载体，以提高其对甲基叔丁基醚的吸附能力和生物膜的形成，与传统的颗粒活性炭（GAC）相比。合成了聚吡咯（PPy）改性活性炭复合材料（PPy/GAC），采用傅里叶变换红外光谱（FT-IR）和比表面积（BET）对PPy/GAC进行了表征。吸附过程符合准二级动力学方程和Langmuir吸附等温式。在此基础上，分别以聚吡咯/活性炭、聚吡咯和活性炭为载体构建了3个生物膜反应器，考察了连续流条件下对甲基叔丁基醚的降解效果。与PPy和GAC生物膜反应器相比，PPy/GAC生物膜柱在不同的处理条件下出水稳定，长期出水MTBE浓度<20 μg/L。铜绿假单胞菌和皮特不动杆菌可能是这些生物膜反应器中降解MTBE的主要细菌。
Methyl tert-butyl ether (MTBE) has been used as a common gasoline additive worldwide since the late twentieth century, and it has become the most frequently detected groundwater pollutant in many countries. This study aimed to synthesize a novel microbial carrier to improve its adsorptive capacity for MTBE and biofilm formation, compared to the traditional granular activated carbon (GAC). A polypyrrole (PPy)-modified GAC composite (PPy/GAC) was synthesized, and characterized by Fourier transform infrared spectroscopy (FT-IR) and Brunauer-Emmett-Teller (BET) surface area analysis. The adsorption behaviors of MTBE were well described by the pseudo-second-order and Langmuir isotherm models. Furthermore, three biofilm reactors were established with PPy/GAC, PPy, and GAC as the carriers, respectively, and the degradation of MTBE under continuous flow was investigated. Compared to the biofilm reactors with PPy or GAC (which both broke after a period of operation), the PPy/GAC biofilm column produced stable effluents under variable treatment conditions with a long-term effluent MTBE concentration <20 μg/L. Pseudomonas aeruginosa and Acinetobacter pittii may be the predominant bacteria responsible for MTBE degradation in these biofilm reactors.