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首页> 外文期刊>Environmental Science & Technology >Impact of Surface Chemistry on Microwave-Induced Degradation of Atrazine in Mineral Micropores
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Impact of Surface Chemistry on Microwave-Induced Degradation of Atrazine in Mineral Micropores

机译：表面化学对矿物质微孔中阿特拉津的微波降解影响

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摘要

Surface chemistry determines the interactions of sorbate and solvent molecules with the pore wall surfaces of microporous minerals, and affects the transmission and absorption of microwave radiation for a given solvent-sorbate-sorbent system. The sorption and microwave-induced degradation of atrazine in the micropores of nine Y zeolites with different densities (0.16-2.62 sitem~2) and types (Mg~(2+), Ca~(2+), H~+, Na~+, and NH_4~+) of surface cations were studied. The influence of the content of cosorbed water in the mineral micropores on atrazine degradation rate was also examined. The results indicate the presence of surface cations at around 0.23 sitem~2 on the pore wall surface was optimal for atrazine degradation, probably due to formation of insufficient number of "hot spots" with too few cations but excessive competition for microwave energy with too many hydrated cations. Atrazine degraded faster in the presence of cations with lower hydration free energies, which could be attributed to less microwave energy consumption to desorb the bounded water molecules. Reducing the content of coadsorbed water in the micropores also increased atrazine degration rate because of less competition for microwave energy from water. Such mechanistic understanding can guide the design and selection of microporous minerals in the practical application of microwave-induced degradation.
机译：表面化学决定了吸附剂和溶剂分子与微孔矿物的孔壁表面的相互作用，并影响给定溶剂-吸附剂-吸附剂系统的微波辐射的传输和吸收。密度（0.16-2.62 site / nm〜2）和类型（Mg〜（2 +），Ca〜（2 +），H〜+，研究了表面阳离子的Na〜+和NH_4〜+）。还研究了矿物微孔中共吸附水含量对at去津降解速率的影响。结果表明，孔壁表面上存在约0.23个位点/ nm〜2的表面阳离子最适合阿特拉津的降解，这可能是由于形成的“热点”数量不足，阳离子太少而对微波能量的过度竞争所致。太多的水合阳离子。在水合自由能较低的阳离子存在下，阿特拉津的降解速度更快，这可能归因于微波能量消耗较少，从而解吸了结合的水分子。减少微孔中共吸附水的含量也增加了阿特拉津的降解速率，因为与水中微波能量的竞争较少。这种机制上的理解可以指导微波诱导降解的实际应用中微孔矿物的设计和选择。

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  • 来源
    《Environmental Science & Technology》 |2013年第1期|533-541|共9页
  • 作者

    Erdan Hu; Hefa Cheng;

  • 作者单位

    State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China,University of Chinese Academy of Sciences, Beijing 100049, China;

    State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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