<?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>2223-4861</journal-id>
<journal-title><![CDATA[Centro Azúcar]]></journal-title>
<abbrev-journal-title><![CDATA[cen. az.]]></abbrev-journal-title>
<issn>2223-4861</issn>
<publisher>
<publisher-name><![CDATA[Editorial Feijóo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2223-48612020000300083</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[ISOTERMAS DE ADSORCIÓN DE IONES Cu (II) EN SILICATOS DE ALTO DESORDEN RETICULAR]]></article-title>
<article-title xml:lang="en"><![CDATA[ADSORTION ISOTERMAS OF ION Cu (II) IN HIGH DISORDER RETICULAR SILICATES]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prieto García]]></surname>
<given-names><![CDATA[Julio Omar]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Curbelo Sánchez]]></surname>
<given-names><![CDATA[Alfredo E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Albelo]]></surname>
<given-names><![CDATA[Eugenio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ribalta Quesada]]></surname>
<given-names><![CDATA[Juan Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Enríquez García]]></surname>
<given-names><![CDATA[Mixary]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Central &#8220;Marta Abreu&#8221; de Las Villas Facultad de Química y Farmacia Departamento Licenciatura en Química]]></institution>
<addr-line><![CDATA[Santa Clara Villa Clara]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Central &#8220;Marta Abreu&#8221; de Las Villas Facultad de Química y Farmacia Departamento de Ingeniería Química]]></institution>
<addr-line><![CDATA[Santa Clara Villa Clara]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2020</year>
</pub-date>
<volume>47</volume>
<numero>3</numero>
<fpage>83</fpage>
<lpage>94</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2223-48612020000300083&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2223-48612020000300083&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2223-48612020000300083&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN  Introducción: Los silicatos amorfos son utilizados como adsorbentes de metales pesados en solución acuosa.  Objetivo: Determinar las isotermas correspondientes a la adsorción en el sistema heterogéneo de masa solución acuosa de iones Cu (II) y silicatos amorfos de magnesio, calcio, aluminio y zinc.  Materiales y Métodos: Se expone la isoterma que rige el proceso de adsorción de iones Cu (II) en régimen estático desde disoluciones acuosas en varios productos de base silícica con agua de comportamiento zeolítico en su estructura. El proceso de adsorción de iones se lleva a cabo con determinadas condiciones de acidez, temperatura, concentración de iones Cu2+, diámetro de partícula y tiempo de interacción. Las disoluciones tienen un pH de 5,06 unidades, con agitación a 300 rpm en un agitador mecánico AGU-10 Bunsen a 25oC. Se toman 40 mL de solución y se ponen en contacto durante 30 minutos, con 0,2 g del silicato del metal correspondiente con la agitación propuesta a la temperatura de 25oC; luego se filtra, y se determina la concentración final por Espectroscopia de Absorción Atómica. Se implementan las isotermas de Langmuir, Langmuir-Freundlich, Freundlich, Dubinin-Radushkevich, BET, Redlich, Radke-Prausnitz y Tempkin.  Resultados y Discusión: El modelo de Langmuir para la isoterma de adsorción es el que mejor ajusta a la adsorción de los iones Cu (II) en solución acuosa.  Conclusiones: Los silicatos de calcio, zinc, magnesio y aluminio son materiales ligeros y con moderada superficie específica. Presentan moderadas capacidades de adsorción de los iones Cu (II) en solución acuosa.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT  Introduction: Amorphous silicates are used as heavy metal adsorbents in aqueous solution.  Objective: To determine adsorption isotherms in a heterogeneous system constituted for a Cu (II) ions aqueous solution and magnesium, calcium, aluminum and zinc amorphous silicates.  Materials and methods: The mechanism that governs Cu (II) ions adsorption process from aqueous solutions in static regime over various silicon-based products with zeolitic behavior water in its structure, obtained by a gelation process, is exposed. The ion adsorption process is carried out under certain conditions of acidity, temperature, Cu2 + ions concentration, particle diameter and interaction time. The solutions have a pH of 5.06 units. Stirring velocity was 300 rpm on an AGU-10 Bunsen mechanical stirrer at 25 oC. A solution amount of 40 mL is mixed for 30 minutes with 0.2 g of corresponding metal silicate with the proposed stirring at 25 oC; it is then filtered, and the final concentration is determined by Atomic Absorption Spectroscopy.  Results and Discussion: Langmuir's model for the adsorption isotherm has the best adjust for Cu (II) ions adsorption in aqueous solution.  Conclusions: Calcium, zinc, magnesium and aluminum silicates are light materials and have moderate specific surface. They have Cu (II) ions moderate adsorption capacities in aqueous solution.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[adsorción de Cu (II)]]></kwd>
<kwd lng="es"><![CDATA[silicatos amorfos]]></kwd>
<kwd lng="es"><![CDATA[termodinámica]]></kwd>
<kwd lng="en"><![CDATA[Cu (II) adsorption]]></kwd>
<kwd lng="en"><![CDATA[amorphous silicates]]></kwd>
<kwd lng="en"><![CDATA[thermodynamics]]></kwd>
</kwd-group>
</article-meta>
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