Dunia E. Santiago

Dunia E. Santiago
Universidad de Las Palmas de Gran Canaria | ULPGC · Department of Chemistry

PhD

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17
Publications
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364
Citations

Publications

Publications (17)
Article
Full-text available
Two series of new photocatalysts were synthesized based on modification with Pd of the commercial P25 photocatalyst (EVONIK®). Two techniques were employed to incorporate Pd nanoparticles on the P25 surface: photodeposition (series Pd-P) and impregnation (series Pd-I). Both series were characterized in depth using a variety of instrumental techniqu...
Article
Full-text available
Magnetite (Fe3O4), a core-shell material (SiO2@Fe3O4), and reduced graphene oxide-Fe3O4 (referred as rGO-MN) were used as supports of a specific highly active TiO2 photocatalyst. Thermal treatments at 200 or 450 °C, different atmospheres (air or N2), and TiO2:support weight ratios (1.0, 1.5, or 2.0) were investigated. X-ray diffractograms revealed...
Article
Fenton-based processes have been studied for the mineralization and detoxification of wastewaters from the postharvest of fruit, which were contaminated with the fungicide imazalil (IMZ). For this purpose, studies were carried out in a simulated agro-industrial wastewater. Statistical design of experiments was used to assess the influence of IMZ, F...
Article
This work analyses the treatment of ornamental aquaculture wastewater contaminated with the antibiotic metronidazole (MTZ) using a reactor with supported TiO2. Preliminary photolysis and hydrolysis studies revealed inefficient elimination of this pollutant under the study conditions. The activity of various photocatalysts in suspension in the elimi...
Article
The aim of this study was to find a recycling use for waste material (WTiO 2) that results from the extraction process of TiO 2 from ilmenite in the pigment industry. In view of its high TiO 2 content, the photocatalytic activity of this material was tested in the degradation of humic and fulvic acid substances (HFAs) and showed low levels of photo...
Article
The aim of this study was to find a recycling use for waste material (WTiO2) that results from the extraction process of TiO2 from ilmenite in the pigment industry. In view of its high TiO2 content, the photocatalytic activity of this material was tested in the degradation of humic and fulvic acid substances (HFAs) and showed low levels of photoact...
Article
A detailed study is undertaken of the photocatalytic activity in hydrogen production of the commercial photocatalyst Kronos vlp7000 (KR) surface-modified with photodeposited platinum particles (2.1 wt% Pt). The influence of different photocatalytic variables is studied: photocatalyst loading, suspension pH value and the nature and concentration of...
Article
In this work, a TiO2 photocatalyst synthesized using a sol-gel procedure (SG750) was Pt modified through photodeposition (SG750-2.1 wt%Pt) and tested for its efficiency in hydrogen production by heterogeneous photocatalysis in the presence of different alcohols as sacrificial agents. The tested alcohols were: methanol, ethanol, ethyleneglycol and g...
Article
This work studies the elimination, mineralization and detoxification through Fenton-based processes of wastewaters contaminated with the fungicide imazalil as a result of the postharvest treatment of bananas. Fe(II) and H2O2 concentrations were optimized for degradation of the corresponding imazalil concentrations. The activity of the imazalil degr...
Article
Abstract In this study, the photoactivity of commercial and lab-made TiO2 when immobilized on different supports, namely borosilicate glass, alumina foam and refractory brick, was examined for the removal of the fungicide imazalil from different water matrices. Alumina foam provided the largest exposed photocatalyst surface but degradation kinetics...
Article
In this work we studied the elimination, mineralization and detoxification of wastewaters from banana postharvest industries, contaminated with the fungicide imazalil, by means of heterogeneous advanced oxidation processes. We compared the activity of the commercial photocatalyst Evonik P25 and the lab-made EST-1023t in the degradation of imazalil...
Article
The elimination and mineralization of the fungicide imazalil and its by-products has been studied by means of heterogeneous photocatalysis. The activity of different photocatalysts, including the commercial TiO2 benchmark photocatalyst (Evonik P25) and several TiO2-based lab-made catalysts, is compared. The best results were achieved with the new l...
Article
Full-text available
This research determines the advantages of the use of brine from reverse osmosis seawater desalination processes as hypersaline culture media to grow Dunaliella salina. In this work, we evaluated the growth of a new strain of D. salina (Ds. Janubiense-ITC5.105) cultured in residual brine and in artificial hypersaline media compared with the product...
Article
Full-text available
The use of evaporation ponds is one alternatlve to direct disposal of desalination brine. Evaporat¡on ponds are shallow basins that expose their contents to the environment, reducing liquid volume by means of evaporation. As they resemble trad¡tional salt works that customarily use seawater, evaporation ponds were analyzed for their use for brine d...
Article
Desalination is currently one of the available solutions to the problem of the lack of water present in most countries due to the global increase in water demand. One of the desalination plants main problem is the large amount of reject brine produced, which can very often severely damage the receiving environment. Nowadays, the management of this...
Article
Full-text available
The elimination and detoxification of water contaminated with the principal commercial fungicides—thia-bendazole (Textar 60 T) and imazalil sulphate (Fruitgard IS 7.5)—used in the postharvest treatment of ba-nanas was successfully achieved through the use of advanced oxidation processes (AOPs). The techniques tested were heterogeneous photocatalysi...

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