Quantification of hydroxyl radicals on cementitious materials by fluorescence spectrophotometry as a method to assess the photocatalytic activity
Quantification of hydroxyl radicals on cementitious materials by fluorescence spectrophotometry as a method to assess the photocatalytic activity
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DOI：
10.1016/j.cemconres.2015.04.011
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发表时间：
2015-08
影响因子：
11.4
通讯作者：
E. Jiménez-Relinque;M. Castellote
中科院分区：
文献类型：
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作者：
E. Jiménez-Relinque;M. Castellote
采用对苯二甲酸（TA）作为探针的荧光光谱法（TA- fl法）对几种光催化胶凝材料产生的羟基自由基（oh自由基点）进行了定量研究。利用所建立的方法对6种不同材料的OHradical dot进行了评价，并将其光催化活性与nox降解率进行了比较，结果表明，尽管nox的降解率明显大于OHradical dot，但两者之间存在正相关关系。这种差异不能完全归因于自由基dotO2−的贡献。因此，我们假设大部分的nox降解都是通过光催化剂表面的孔洞进行的，并与本体溶液中的oh自由基dot保持平衡，这使得oh自由基dot的定量仍然是胶凝材料光催化性能的有效指标。
The production of hydroxyl radicals (OHradical dot) by several photocatalytic cementitious materials was quantified by an adaptation of Terephthalic acid (TA) as probe method for fluorescence spectrometry (TA-FL method) for construction materials. Six different materials were evaluated for OHradical dotusing the method developed, and the photocatalytic activity was compared with the NOxdegradation rate, obtaining a positive relationship between both parameters even though the rate of NOxdegradation was significantly larger than that of the OHradical dotdetected. The difference could not be attributed exclusively to the contribution ofradical dotO2−. Thus, it has been postulated that most of the NOxdegradation takes place through the holes, trapped in the surface of the photocatalyst, in equilibrium with OHradical dotin the bulk solution, which still makes the quantification of OHradical dotas an effective indicator of the photocatalytic performance of cementitious materials.