Dechlorination of Environmental Contaminants Using a Hybrid Nanocatalyst: Palladium Nanoparticles Supported on Hierarchical Carbon Nanostructures
Dechlorination of Environmental Contaminants Using a Hybrid Nanocatalyst: Palladium Nanoparticles Supported on Hierarchical Carbon Nanostructures
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使用混合纳米催化剂脱氯环境污染物：分级碳纳米结构负载的钯纳米颗粒
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发表时间：
2012
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通讯作者：
S. Mukhopadhyay
中科院分区：
文献类型：
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作者：
H. Vijwani;A. Agrawal;S. Mukhopadhyay
本文展示了一种新型混合纳米催化剂材料的有效性，该材料将纳米颗粒和纳米管的高表面积与结构坚固性和易于处理较大载体相结合。该混合材料是通过在两种类型的碳载体上制造钯纳米颗粒制成的：原样微孔泡沫（泡沫）和碳纳米管锚定在孔壁上的泡沫（CNT/泡沫）。采用气相色谱法研究了这些材料对四氯化碳的催化还原脱氯作用。可以看出，虽然两种钯官能化的碳载体在四氯化碳的降解中都是高度有效的，但是在CNT/泡沫上的钯的情况下，降解速率显著增加。然而，如果这些结构的润湿性在未来能够得到增强，则有进一步提高该速率的空间。对新鲜催化剂和使用过的催化剂进行了显微结构和光谱分析，结果表明，在脱氯试验中，催化剂在长期使用后的密度和表面化学状态没有变化。这意味着这些材料可以重复使用，因此为水的脱氯提供了一种简单，强大和具有成本效益的方法。
This paper demonstrates the effectiveness of a new type of hybrid nanocatalyst material that combines the high surface area of nanoparticles and nanotubes with the structural robustness and ease of handling larger supports. The hybrid material is made by fabricating palladium nanoparticles on two types of carbon supports: as-received microcellular foam (Foam) and foam with carbon nanotubes anchored on the pore walls (CNT/Foam). Catalytic reductive dechlorination of carbon tetrachloride with these materials has been investigated using gas chromatography. It is seen that while both palladium-functionalized carbon supports are highly effective in the degradation of carbon tetrachloride, the rate of degradation is significantly increased with palladium on CNT/Foam. However, there is scope to increase this rate further if the wettability of these structures can be enhanced in the future. Microstructural and spectroscopic analyses of the fresh and used catalysts have been compared which indicates that there is no change in density or surface chemical states of the catalyst after prolonged use in dechlorination test. This implies that these materials can be used repeatedly and hence provide a simple, powerful, and cost-effective approach for dechlorination of water.