Náfrádi Máté, Alapi Tünde, Bencsik Gábor, Janáky Csaba
Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary.
Nanomaterials (Basel). 2021 Dec 21;12(1):5. doi: 10.3390/nano12010005.
In this work, the application of high-power LED and commercial, low-price LED for heterogeneous photocatalysis with TiO and ZnO photocatalysts are studied and compared, focusing on the effect of light intensity, photon energy, quantum yield, electrical energy consumption, and effect of matrices and inorganic components on radical formation. Coumarin (COU) and its hydroxylated product (7-HC) were used to investigate operating parameters on the OH formation rate. In addition to COU, two neonicotinoids, imidacloprid and thiacloprid, were also used to study the effect of various LEDs, matrices, and inorganic ions. The transformation of COU was slower for LED than for LED, but r/r ratio was significantly higher for LED. The COU mineralization rate was the same for both photocatalysts using LED, but a significant difference was observed using LED. The impact of matrices and their main inorganic components Cl and HCO were significantly different for ZnO and TiO. The negative effect of HCO was evident, however, in the case of high-power LED and TiO, and the formation of CO almost doubled the r and contributes to the conversion of neonicotinoids by altering the product distribution and mineralization rate.
在本研究中，对大功率发光二极管（LED）和商用低价LED在与二氧化钛（TiO）和氧化锌（ZnO）光催化剂进行多相光催化中的应用进行了研究和比较，重点关注光强度、光子能量、量子产率、电能消耗以及基质和无机成分对自由基形成的影响。使用香豆素（COU）及其羟基化产物（7 - HC）来研究羟基自由基（OH）生成速率的操作参数。除了COU外，还使用了两种新烟碱类农药，吡虫啉和噻虫啉，来研究各种LED、基质和无机离子的影响。LED对COU的转化比LED慢，但LED的r/r比率显著更高。使用LED时，两种光催化剂的COU矿化率相同，但使用LED时观察到显著差异。基质及其主要无机成分氯离子（Cl）和碳酸氢根离子（HCO）对ZnO和TiO的影响显著不同。然而，在大功率LED和TiO的情况下，HCO的负面影响很明显，并且CO的形成使r几乎翻倍，并通过改变产物分布和矿化率促进新烟碱类农药的转化。
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