Oxidation of anthracene using waste Mn oxide minerals: the importance of wetting and drying sequences.

Oxidation of anthracene using waste Mn oxide minerals: the importance of wetting and drying sequences.
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使用废锰氧化物矿物氧化蒽:润湿和干燥顺序的重要性。

DOI:
10.1016/j.jhazmat.2011.12.047
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发表时间:
2012
影响因子:
13.6
通讯作者:
Clarke C
Clarke C
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Clarke C

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由于多环芳烃的顽固性,多环芳烃在污染的城市土壤中是一个常见的问题。本研究介绍了蒽在合成和天然氧化锰表面的氧化结果。添加了蒽的氧化锰浆料在空气中的蒸发导致30%的蒽氧化为蒽醌。对照矿物,石英和方解石,当加尖的矿浆在空气中蒸发时,也氧化了一小部分但很重要的蒽(转化率分别为4.5%和14%)。而在无氧(n2气氛)蒸发时,只有Mn氧化物矿物表现出明显的蒽氧化(5-10%)。在不发生干燥的完全水化体系中,随着pH值的降低,天然锰氧化物的蒽氧化率增加,pH值为4时,蒽的转化率为75%。这些结果表明,酸化和干燥都有利于蒽在氧化锰矿物表面的氧化。研究还表明,非氧化还原活性矿物表面,如方解石,可能在润湿和干燥过程中对污染物的分解起作用。鉴于气候变化表明干湿序列可能变得更加重要,这些结果对污染土地修复技术具有重要意义。
PAHs are a common problem in contaminated urban soils due to their recalcitrance. This study presents results on the oxidation of anthracene on synthetic and natural Mn oxide surfaces. Evaporation of anthracene spiked Mn oxide slurries in air results in the oxidation of 30% of the anthracene to anthraquinone. Control minerals, quartz and calcite, also oxidised a small but significant proportion of the anthracene (4.5% and 14% conversion, respectively) when spiked mineral slurries were evaporated in air. However, only Mn oxide minerals showed significant anthracene oxidation (5–10%) when evaporation took place in the absence of oxygen (N2atmosphere). In the fully hydrated systems where no drying took place, natural Mn oxides showed an increase in anthracene oxidation with decreasing pH, with a conversion of 75% anthracene at pH 4. These results show both acidification and drying favor the oxidation of anthracene on Mn oxide mineral surfaces. It has also been demonstrated that non-redox active mineral surfaces, such as calcite, may play a role in contaminant breakdown during wetting and drying sequences. Given that climate changes suggest that wetting and drying sequences are likely to become more significant these results have important implications for contaminated land remediation technologies.
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