Photoelectrocatalytic degradation of camphor on TiO2/RuO2 electrodes

Freitas, Adriane Martins de; Sirtori, Carla; Peralta‐Zamora, Patricio

doi:10.1007/s10311-009-0252-8

Cited by 22 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this context, UV irradiation is considered as a potential activation technology [13][14][15][24][25][26][27] because it favors the formation of radical species by decomposition of more stable oxidants (Eq. 8-10).…”

Section: H2o → •Oh + H + + E -mentioning

confidence: 99%

Electrolytic and electro-irradiated processes with diamond anodes for the oxidation of persistent pollutants and disinfection of urban treated wastewater

Cotillas

Vidales

Llanos

et al. 2016

Journal of Hazardous Materials

View full text Add to dashboard Cite

This paper analyzes the advantages and drawbacks of the combination of UV irradiation with electrolysis with the aim to give insight about the feasibility of the application of this technology for the reclaiming of conventionally-treated wastewater. The oxidation of synthetic solutions containing five selected model complex pollutants has been compared, showing that UV irradiation improves the results of electrolysis for progesterone, metoprolol and caffeine and deteriorates the performance for the degradation of sulfamethoxazole and dimethyl-phthalate. Differences observed becomes lower when mineralization is compared showing that the effects of UV irradiation are diluted when a mixture of species is oxidized. Results suggest that high ThOD/TOC (Theoretical Oxygen Demand/Total Organic Carbon) ratios improve the synergistic coupling of technologies while low values lead to a clear antagonistic effect. Because during oxidation progress this ratio is decreased, the observed effect on mineralization is much lower than in the oxidation of the raw molecule. Opposite to this low effect on the oxidation of organics, the improvement in the performance of the disinfection by coupling UV to electrolysis is much clearer. In addition, UV irradiation modifies significantly the chlorine speciation and helps to prevent the formation of hazardous species such as chlorate and perchlorate during the electrochemical processes.

show abstract

Section: H2o → •Oh + H + + E -mentioning

confidence: 99%

Electrolytic and electro-irradiated processes with diamond anodes for the oxidation of persistent pollutants and disinfection of urban treated wastewater

Cotillas

Vidales

Llanos

et al. 2016

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

“…More recently, the coupling of CDEO and ultrasound (US) or ultraviolet (UV) irradiations have been studied in order to evaluate possible improvements in the performance of the electrochemical processes (de Vidales et al 2015, Goeting et al 1999, Hurwitz et al 2014, Khataee et al 2014, Vidales et al 2014. Specifically, the application of UV irradiation seems to promote the photo-activation of the oxidizing species electrogenerated in the electrochemical cell, favouring the degradation of organic matter (Catanho et al 2006, de Freitas et al 2011, Osugi et al 2005, Socha et al 2007. Thus, higher efficiencies can be attained for the removal of several pollutants in wastewater using photo-electrolytic processes.…”

Section: Introductionmentioning

confidence: 99%

Scale-up of electrolytic and photoelectrolytic processes for water reclaiming: a preliminary study

Vidales

Cotillas

Perez-Serrano

et al. 2016

Environ Sci Pollut Res

View full text Add to dashboard Cite

This work focuses on the scale-up of electrochemical and photoelectrochemical oxidation processes with diamond anodes for the removal of organic pollutants and disinfection of treated urban wastewater, two of the most important parameters for the reclaiming of wastewater. The removal of organics was studied with actual biologically treated urban wastewater intensified with 100 mg dm(-3) of caffeine, added as a trace organic pollutant. The disinfection was also studied with biologically treated urban wastewater, and Escherichia coli was used to monitor the efficiency of the process. Results obtained with a single DiaCell® 101 were compared with those obtained with a single-stack DiaCell® 1001 and with a pilot plant made up of five of these stacks. Results obtained demonstrate that scale-up is not a simple but a very complex process, in which not only the electrode and the irradiation dose are important but also mass transfer conditions. Enhanced mass transport conditions have a determining and very positive effect on the removal of organics and a negative effect on the disinfection. Likewise, ultraviolet (UV) irradiation affects in a different way in the different setups used, having a great influence on the removal of complex organics and on the speciation of oxidants produced during disinfection. This works helps to understand the key differences observed in the scale-up, and it is a first approach for future works focused on the real application of conductive diamond electrochemical oxidation.

show abstract

“…Furthermore, to improve the efficiency of this process, in which typically POPs concentrations are very low, scientific efforts have been focused on the combination of anodic oxidation with other processes such as oxidant production. In this respect, ultraviolet light ultraviolet (UV) or ultrasonic (US) radiation [12][13][14][15][16][17][18][19][20][21][22][23] can help expand the applicability of electrochemical technology used to treat concentrated wastewater (typically industrial effluents) to the removal of organics in diluted flows (such as the removal of POPs from urban treated wastewater) [24,25].…”

Section: Introductionmentioning

confidence: 99%

Irradiation-assisted electrochemical processes for the removal of persistent organic pollutants from wastewater

et al. 2015

View full text Add to dashboard Cite

This work focused on the removal of persistent organic pollutants (POPs) from wastewater using irradiation-assisted electrochemical technologies, i.e. sonoelectrolysis, photoelectrolysis and sono-photoelectrolysis. Single-irradiation processes (sonolysis and photolysis) and electrochemical oxidation using conductive diamond anodes (current density of 30 mA cm -2 ) were also evaluated for comparison. Three POPs with different molecular structures (sulfamethoxazole, metoprolol and caffeine, initial concentration of 100 mg dm -3 ) were studied to evaluate the robustness of the selected technologies and the oxidation mechanisms involved in each case. Results show that the single application of the irradiation technologies led to the removal of only a small amount of POPs and no mineralisation, with the nature of the pollutant showing a marked effect; the opposite was observed for the single application of conductive diamond electrochemical oxidation (CDEO), which is a highly robust and efficient technology for the degradation of all types of POPs. Sonoelectrolysis, photoelectrolysis and sono-photoelectrolysis processes (ultrasound conditions: 200 W, ultraviolet conditions: 254 nm, 4 W) may show synergistic, antagonistic or nil effects with respect to a single electrochemical oxidation event, depending on the nature of the treated molecule. The differences observed may be related to the different chemical nature of the organic species studied, indicating an important role of mediated oxidation processes, which may be enhanced with ultrasounds and ultraviolet radiation techniques.

show abstract

Photoelectrocatalytic degradation of camphor on TiO2/RuO2 electrodes

Cited by 22 publications

References 20 publications

Electrolytic and electro-irradiated processes with diamond anodes for the oxidation of persistent pollutants and disinfection of urban treated wastewater

Electrolytic and electro-irradiated processes with diamond anodes for the oxidation of persistent pollutants and disinfection of urban treated wastewater

Scale-up of electrolytic and photoelectrolytic processes for water reclaiming: a preliminary study

Irradiation-assisted electrochemical processes for the removal of persistent organic pollutants from wastewater

Contact Info

Product

Resources

About