Venditti Francesco, Cuomo Francesca, Ceglie Andrea, Avino Pasquale, Russo Mario Vincenzo, Lopez Francesco
†Consorzio per lo Sviluppo Industriale della Valle del Biferno (COSIB), 86075 Termoli, Italy.
‡Department of Agricultural, Environmental and Food Sciences (DiAAA) and Center for Colloid and Surface Science (CSGI), Università degli Studi del Molise, Via De Sanctis, I-86100 Campobasso, Italy.
Langmuir. 2015 Mar 31;31(12):3627-34. doi: 10.1021/acs.langmuir.5b00560. Epub 2015 Mar 20.
The removal of the phenolic compound, caffeic acid, by photodegradation has been investigated using carbon-doped titanium dioxide particles as a photocatalyst under visible light. UV-vis absorption spectroscopy and gas chromatography-ion trap mass spectrometry analyses revealed a substrate concentration dependence of the removal of caffeic acid from a water solution. The k2 and t(0.5) parameters of each reaction were calculated by fitting kinetics data to a second-order kinetic adsorption model. To evaluate the photodegradation event, the effect of the adsorption process on the whole degradation was also monitored in the absence of light. Adsorption isotherm studies supported by ζ potential and scanning electron microscopy data demonstrated the pivotal role of the absorption mechanism. It was found that the whole photodegradation process is governed by a synergic mechanism in which adsorption and photodegradation are involved. This study, centered on the removal of caffeic acid from aqueous solutions, highlights the potential application of this technology for the elimination of phenolic compounds from olive mill wastewater, a fundamental goal in both the agronomical and environmental fields.
在可见光条件下，以碳掺杂二氧化钛颗粒作为光催化剂，对酚类化合物咖啡酸的光降解去除进行了研究。紫外可见吸收光谱和气相色谱 - 离子阱质谱分析表明，从水溶液中去除咖啡酸存在底物浓度依赖性。通过将动力学数据拟合到二级动力学吸附模型来计算每个反应的k2和t(0.5)参数。为了评估光降解过程，在无光条件下也监测了吸附过程对整体降解的影响。由ζ电位和扫描电子显微镜数据支持的吸附等温线研究证明了吸附机制的关键作用。结果发现，整个光降解过程由吸附和光降解共同参与的协同机制控制。这项以从水溶液中去除咖啡酸为中心的研究，突出了该技术在去除橄榄榨油废水酚类化合物方面的潜在应用，这是农业和环境领域的一个基本目标。
