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首页> 外文期刊>RSC Advances >Efficient visible light photocatalytic activity of p-n junction CuO/TiO2 loaded on natural zeolite
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Efficient visible light photocatalytic activity of p-n junction CuO/TiO2 loaded on natural zeolite

机译：天然沸石负载p-n结CuO / TiO2的高效可见光催化活性

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Highly efficient and visible-light-responsive p-n junction CuO/TiO2-zeolite heterogeneous nanostructures had been successfully synthesized by a standard impregnation method. A detailed study of p-n junction CuO/TiO2-zeolite impacting on the photodecoloration of a MB solution showed that the composite was highly reusable and stable for long-running photocatalytic application. The apparent rate constant of the CuO/TiO2-zeolite was calculated to be 0.0704 min(-1), which is 1.4 times higher than that of TiO2-zeolite (k = 0.048 min(-1)) and 1.9 times higher than that of zeolite (k = 0.0368 min(-1)). The experimental results indicated that the composites had a superior photocatalytic activity for the decoloration of dye wastewater under visible light irradiation because the p-n junction was formed between CuO and TiO2. The assembly of p-type CuO produces a large number of p-n junction heterostructures on the surface of TiO2, where CuO and TiO2 form p-and n-type semiconductors, respectively. The p-n junction could efficiently suppress charge recombination, improve interfacial charge transfer, enhance visible-light adsorption and provide plentiful photocatalytic reaction active sites. This new p-n junction heteronanostructure is expected to show considerable potential application in solar-driven wastewater treatment.
机译：通过标准的浸渍方法已经成功地合成了高效且可见光响应的p-n结CuO / TiO2-沸石异质纳米结构。对p-n结CuO / TiO2-沸石对MB溶液光脱色的影响的详细研究表明，该复合材料具有很高的可重用性，并且对于长时间的光催化应用是稳定的。计算得出，CuO / TiO2-沸石的表观速率常数为0.0704 min（-1），是TiO2-沸石（k = 0.048 min（-1））的1.4倍，是TiO2-沸石的1.9倍。沸石（k = 0.0368 min（-1））。实验结果表明，该复合材料在CuO和TiO2之间形成p-n结，对可见光照射下的染料废水具有优异的光催化活性。 p型CuO的组装在TiO2的表面上产生大量的p-n结异质结构，其中CuO和TiO2分别形成p型和n型半导体。 p-n结可有效抑制电荷复合，改善界面电荷转移，增强可见光吸收并提供大量光催化反应活性位点。这种新的p-n结异质结构有望在太阳能驱动的废水处理中显示出巨大的潜在应用。

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