<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992019000100223</article-id>
<article-id pub-id-type="doi">10.20937/rica.2019.35.01.16</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[REMOCIÓN DE COLORANTES AZO CON ALGINATO: RELACIÓN ENTRE ESTRUCTURA DE COLORANTE Y EFICIENCIA DE REMOCIÓN]]></article-title>
<article-title xml:lang="en"><![CDATA[REMOVAL OF AZO DYES WITH ALGINATE: RELATIONSHIP BETWEEN DYE STRUCTURE AND REMOVAL EFFICIENCY]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lozano-Álvarez]]></surname>
<given-names><![CDATA[Juan Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marañón-Ruiz]]></surname>
<given-names><![CDATA[Virginia Francisca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jáuregui-Rincón]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medina-Ramírez]]></surname>
<given-names><![CDATA[Iliana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salinas-Gutiérrez]]></surname>
<given-names><![CDATA[Rogelio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Frausto-Reyes]]></surname>
<given-names><![CDATA[Claudio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Departamento de Ingeniería Bioquímica ]]></institution>
<addr-line><![CDATA[Aguascalientes ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de los Lagos Departamento de Ciencias de la Tierra y de la Vida]]></institution>
<addr-line><![CDATA[Lagos de Moreno Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Departamento de Química ]]></institution>
<addr-line><![CDATA[Aguascalientes ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de Aguascalientes Departamento de Estadística ]]></institution>
<addr-line><![CDATA[Aguascalientes ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Centro de Investigaciones en Óptica  ]]></institution>
<addr-line><![CDATA[Aguascalientes ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>35</volume>
<numero>1</numero>
<fpage>223</fpage>
<lpage>236</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992019000100223&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992019000100223&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992019000100223&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Los colorantes azo representan entre 60 y 75 % de los colorantes producidos actualmente. Se utilizan ampliamente en la industria cosmética, del papel, optoelectrónica, textil, etc. Desafortunadamente una vez utilizados, debido a su alta resistencia a tratamientos convencionales de aguas residuales, contaminan los cuerpos de agua donde son descargados. En este reporte se utiliza alginato de sodio (ALG) para remover los colorantes azo rojo directo 80 (RD80), rojo congo (Rcongo) y rojo de metilo (Rmetilo). Estudios de espectroscopía UV-visible, FTIR y Raman ayudaron a elucidar los tautómeros involucrados en su remoción. Los porcentajes de remoción fueron: RD80 (99.9 % a pH = 12 y fuerza iónica= 0.1 M), Rcongo (99.7 % a pH = 12 y fuerza iónica = 0.1 M) y Rmetilo (14.9 % a pH = 7 y fuerza iónica = 0.1 M). El modelo de Zimm-Bragg describe adecuadamente las isotermas experimentales, sugiriendo la importancia de la agregación de los colorantes en su eficiencia de remoción. Adicionalmente, se comparó la eficiencia de remoción de siete colorantes azo y se encontró que moléculas con peso molecular elevado, con alta planaridad y carga positiva mostraron las mayores eficiencias de remoción. Lo anterior permite predecir cualitativamente a partir de las estructuras de colorantes azo, cuál de ellos será removido más eficientemente con el ALG.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The azo dyes represent between 60-75 % of the total of dyes produced nowadays. They are widely used in cosmetic industry, paper, optoelectronic, textile, etc. Unfortunately, due to their high resistance to the conventional treatments applied to wastewaters, they pollute the water bodies where are discharged. In this report, the sodium alginate (ALG) is evaluated for the removal of the azo dyes, Direct red 80 (DR80), Congo red (Rcongo) and Methyl red (Rmetilo). UV-visible, FTIR and Raman spectroscopic studies helped to elucidate the formation of tautomers, species responsible for their removal. The removal percentages were: DR80 (99.9 % at pH = 12 and ionic strength = 0.1 M), Rcongo (99.7 % at pH = 12 and ionic strength = 0.1 M), and Rmetilo (14.9 % at pH = 7 and ionic strength = 0.1 M). The Zimm-Bragg model described adequately the experimental isotherms, suggesting the importance of dye´s aggregation in their removal efficiency. Additionally, the removal efficiency of seven azo dyes was compared and it was found that the highest removal efficiencies are achieved when dye molecules exhibit high molecular weight, planarity and are positively charged. This allows us to predict in a qualitative way, from the azo dye structures, which of them will be removed more efficiently with ALG.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[agregación]]></kwd>
<kwd lng="es"><![CDATA[grupos funcionales]]></kwd>
<kwd lng="es"><![CDATA[gelificación]]></kwd>
<kwd lng="en"><![CDATA[aggregation]]></kwd>
<kwd lng="en"><![CDATA[functional groups]]></kwd>
<kwd lng="en"><![CDATA[gelation]]></kwd>
</kwd-group>
</article-meta>
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