<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2215-3470</journal-id>
<journal-title><![CDATA[Uniciencia]]></journal-title>
<abbrev-journal-title><![CDATA[Uniciencia]]></abbrev-journal-title>
<issn>2215-3470</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional, Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-34702021000100335</article-id>
<article-id pub-id-type="doi">10.15359/ru.35-1.21</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Fotorreducción de dióxido de carbono usando TiO2 sensibilizado con trímeros de Co y Cu en medio acuoso]]></article-title>
<article-title xml:lang="en"><![CDATA[Carbon dioxide photoreduction using TiO 2 sensitized with Co and Cu trimers in aqueous media]]></article-title>
<article-title xml:lang="pt"><![CDATA[Fotorredução de dióxido de carbono usando TiO 2 sensibilizado com trímeros de Co e Cu em meio aquoso]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas-Sánchez]]></surname>
<given-names><![CDATA[Carlos E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Incer-Valverde]]></surname>
<given-names><![CDATA[Jimena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pineda]]></surname>
<given-names><![CDATA[Leslie W.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Durán-Herrera]]></surname>
<given-names><![CDATA[J. Esteban]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Ingeniería Química ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Ingeniería Química ]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Química Centro de Investigación en Electroquímica y Energía Química]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Costa Rica Escuela de Ingeniería Química Centro de Investigación en Electroquímica y Energía Química]]></institution>
<addr-line><![CDATA[ San José]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>335</fpage>
<lpage>351</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-34702021000100335&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-34702021000100335&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-34702021000100335&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen En la presente investigación, se evaluó el desempeño de dos fotocatalizadores de dióxido de titanio, uno sensibilizado con un trímero de cobre (Cu3(dpa)4Cl2) (dpa = 2,2´-dipiridilamina) y el otro con un trímero de cobalto (Co3(dpa)4Cl2), específicamente, en la fotorreducción de dióxido de carbono en medio acuoso. En una primera etapa experimental, se estudió el proceso de sensibilización del TiO2, el cual ocurre en dos reacciones sucesivas, utilizando un reactor de microondas: en la primera, se funcionaliza la superficie del TiO2 con ácido p-aminobenzoico (PABA) que actúa como molécula de enlace entre el TiO2 y el trímero respectivo; luego, en la segunda reacción, se ancla el trímero del metal. Se analizaron tres niveles de temperatura, potencia y tiempo de reacción para cada una de las dos reacciones; sin embargo, un análisis estadístico robusto tipo Taguchi arrojó que no existe diferencia significativa entre los tratamientos para las condiciones seleccionadas. Como resultado de esto, se determinó que para el proceso de sensibilización de los fotocatalizadores se puede trabajar en las siguientes condiciones sin afectar la composición final de cada catalizador: 70 ºC, 100 W y 5 min en la etapa de funcionalización con el PABA y 80 ºC, 150 W y 5 min en el anclaje de ambos tintes. En la segunda etapa experimental se realizó la evaluación de los fotocatalizadores sintetizados para la fotorreducción de CO2 en medio acuoso, empleando una lámpara ultravioleta de mediana presión y un fotorreactor a presión atmosférica y 25 ºC. El catalizador que presentó mejor desempeño fue el sensibilizado con el trímero de cobalto, ya que evidenció mayor producción de metano  y monóxido de carbono ; por su parte, el catalizador sensibilizado con cobre no presentó generación cuantificable de monóxido de carbono y la producción de metano fue considerablemente menor . La producción de hidrógeno por ambos catalizadores fue importante, particularmente, la del catalizador sensibilizado con el trímero de cobre . No se detectó presencia de otros productos de la reducción del CO2 en la fase líquida.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract During this investigation, the performance of two titanium dioxide photocatalysts was evaluated in the photoreduction of carbon dioxide in aqueous media. One of the photocatalysts was sensitized with a copper trimer (Cu3(dpa)4Cl2) (dpa = 2.2´-dipyridylamine) and the other was sensitized with a cobalt trimer (Co3(dpa)4Cl2). Using a microwave reactor, the first experimental stage studied the TiO2 sensitization process, which occurs in two successive reactions: in the first one, the TiO2 surface is functionalized with p-Aminobenzoic acid (PABA) which acts as a binding molecule between TiO2 and the respective trimer, while in the second reaction, the metal trimer is anchored. Three levels of temperature, power output, and reaction time were analyzed for each of the two reactions; however, a Taguchi statistical analysis showed no significant differences between the treatments for the selected conditions. Therefore, it was determined that the photocatalyst sensitization process can be performed under the following conditions without affecting the final composition of each catalyst: 70 °C, 100 W, and 5 min in the functionalization stage with PABA and 80 °C, 150 W, and 5 min in the anchorage of the dyes. In the second experimental stage, the synthesized photocatalysts for CO2 photoreduction in aqueous medium was evaluated utilizing a medium-pressure ultraviolet lamp in a photoreactor at atmospheric pressure and at 25 °C. The catalyst with the best performance was the one sensitized with cobalt trimer since it showed a higher production of methane , and carbon monoxide . The copper sensitized catalyst showed no measurable generation of carbon monoxide, and the methane production was considerably lower . Hydrogen production was important with both catalysts, particularly the catalyst sensitized with the copper trimer . No presence of other CO2 reduction products was detected in the liquid phase.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Na presente pesquisa foi avaliado o desempenho de dois fotocatalisadores de dióxido de titânio, um deles sensibilizado com um trímero de cobre (Cu3(dpa)4Cl2) (dpa = 2,2´-dipiridilamina) e o outro com um trímero de cobalto (Co3(dpa)4Cl2), especificamente, na fotorredução de dióxido de carbono em meio aquoso. Em uma primeira etapa experimental foi estudado o processo de sensibilização do TiO2, que ocorre em duas reações sucessivas utilizando um reator de micro-ondas: na primeira, a superfície do TiO2 é funcionalizada com ácido p-aminobenzóico (PABA) que age como molécula de ligação entre o TiO2 e o trímero respectivo; logo, na segunda reação, o trímero do metal é ancorado. Foram analisados três níveis de temperatura, potência e tempo de reação para cada uma das duas reações; não obstante, uma análise estatística robusta como o método Taguchi mostrou que não existe diferença significativa entre os tratamentos para as condições selecionadas. Como resultado disso, determinou-se que, para o processo de sensibilização dos fotocatalisadores, é possível trabalhar nas seguintes condições sem afetar a composição final de cada catalisador: 70 ºC, 100 W e 5 min na etapa de funcionalização com o PABA e 80 ºC, 150 W e 5 min na ancoragem de ambos os corantes. Na segunda etapa experimental foi realizada a avaliação dos fotocatalisadores sintetizados para a fotorredução de CO2 em meio aquoso, usando uma lâmpada ultravioleta de média pressão e um fotorreator sob pressão atmosférica e 25 ºC. O catalisador que apresentou melhor desempenho foi o sensibilizado com o trímero de cobalto, pois evidenciou maior produção de metano  e monóxido de carbono ; por sua vez, o catalisador sensibilizado com cobre não apresentou geração quantificável de monóxido de carbono e a produção de metano foi consideravelmente menor . A produção de hidrogênio por ambos os catalisadores foi importante, particularmente a do catalisador sensibilizado com o trímero de cobre . Não houve detecção da presença de outros produtos oriundos da redução do CO2 na fase líquida.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fotorreducción de CO2]]></kwd>
<kwd lng="es"><![CDATA[fotocatálisis]]></kwd>
<kwd lng="es"><![CDATA[TiO2]]></kwd>
<kwd lng="es"><![CDATA[sensibilización]]></kwd>
<kwd lng="es"><![CDATA[trímeros metálicos]]></kwd>
<kwd lng="en"><![CDATA[CO2 photoreduction]]></kwd>
<kwd lng="en"><![CDATA[photocatalysis]]></kwd>
<kwd lng="en"><![CDATA[TiO2]]></kwd>
<kwd lng="en"><![CDATA[sensitization]]></kwd>
<kwd lng="en"><![CDATA[metal trimers]]></kwd>
<kwd lng="pt"><![CDATA[fotorredução de CO2]]></kwd>
<kwd lng="pt"><![CDATA[fotocatálise]]></kwd>
<kwd lng="pt"><![CDATA[TiO2]]></kwd>
<kwd lng="pt"><![CDATA[sensibilização]]></kwd>
<kwd lng="pt"><![CDATA[trímeros metálicos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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