Visible light caffeic acid degradation by carbon-doped titanium dioxide

Langmuir : the ACS Journal of Surfaces and Colloids
Francesco VendittiFrancesco Lopez

Abstract

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.

References

Oct 1, 1995·The Journal of Applied Bacteriology·R CapassoG Cristinzio
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Mar 28, 2003·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·R W OwenH Bartsch
Oct 28, 2003·Angewandte Chemie·Shanmugasundaram Sakthivel, Horst Kisch
Sep 15, 2005·Journal of the American Chemical Society·Yasuhiro ShiraishiTakayuki Hirai
Mar 10, 2007·Journal of Colloid and Interface Science·Francesco VendittiFrancesco Lopez
Aug 31, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·Francesco VendittiFrancesco Lopez
Sep 24, 2009·Journal of Hazardous Materials·Francesco VendittiFrancesco Lopez

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Citations

Apr 27, 2018·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Haydar Ali, Nikhil R Jana
May 1, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Maša Islamčević RazboršekMitja Kolar
Jul 5, 2021·Journal of Colloid and Interface Science·Wei QiLong Zhao

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