<?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>1405-888X</journal-id>
<journal-title><![CDATA[TIP. Revista especializada en ciencias químico-biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[TIP]]></abbrev-journal-title>
<issn>1405-888X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-888X2024000100002</article-id>
<article-id pub-id-type="doi">10.22201/fesz.23958723e.2024.649</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reduction of water hardness with porous membranes made with Mexican clays]]></article-title>
<article-title xml:lang="es"><![CDATA[Disminución de la dureza del agua con membranas porosas elaboradas con arcillas mexicanas]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Moreno]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-González]]></surname>
<given-names><![CDATA[Miriam]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos-López]]></surname>
<given-names><![CDATA[Miguel Angel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Campos-Guillén]]></surname>
<given-names><![CDATA[Juan]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santos-Cruz]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Morales]]></surname>
<given-names><![CDATA[José Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zavala-Gómez]]></surname>
<given-names><![CDATA[Carlos Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,University of Queretaro Faculty of Chemistry ]]></institution>
<addr-line><![CDATA[Santiago de Querétaro Querétaro]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Queretaro Faculty of Administration ]]></institution>
<addr-line><![CDATA[Santiago de Querétaro Querétaro]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Autonomous University of Queretaro Faculty of Engineering ]]></institution>
<addr-line><![CDATA[Santiago de Querétaro Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>27</volume>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-888X2024000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-888X2024000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-888X2024000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Based on the properties that clays have, they are considered as raw material for membrane preparation. It is reported that these materials agglomerate easily and possess ion exchange characteristics as well as adsorption capacity for water treatment. The aim of this study was to use Mexican clays to obtain porous membranes to decrease water hardness. The technique used to elaborate the membranes developed during this study consists of the compaction of clay and its subsequent sintering. In the pressing of the raw material, additives were used as lubricants and binders. The pressing was performed in a hydraulic press with a pressure of 150 to 300 Kg/cm2. The sintering was conducted in a muffle at 500 °C, 800ºC and 1,000°C. The raw material was characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF) as well as Nitrogen physisorption. Using X-ray fluorescence, it was determined that the samples of Mexican clay are mainly composed of oxides containing Silicon, Aluminum, Iron, Calcium, and Potassium. Through nitrogen physisorption of the calcined clay, it was inferred that the clay is a mesoporous material. The material exhibits a unimodal distribution; the average pore diameter is 3.42 nm and the specific surface area was 48.8 m²/g. Heat treatment caused chemical changes in the material, which were detected and analyzed by X-ray diffraction. The membrane obtained was characterized using X -ray diffraction (XRD), Nitrogen physisorption, and Scanning Electron Microscopy (SEM). The result of these techniques corroborated that the membrane obtained can be used in filtration processes and was able to remove over 40% of water hardness.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Las arcillas por sus propiedades, son empleadas como materia prima en la elaboración de membranas, debido a que se aglomeran fácilmente y poseen características de intercambio iónico, así como capacidad de adsorción para el tratamiento del agua. El objetivo de este estudio fue utilizar las arcillas mexicanas para obtener membranas porosas y con ellas disminuir la dureza del agua. La técnica utilizada consistió en la compactación de la arcilla y su posterior sinterización. En el prensado de la materia prima se usaron aditivos como lubricantes y aglomerantes, además de una prensa hidráulica con una presión de 150 a 300 Kg/cm2. La sinterización se realizó en una mufla a 500 °C, 800 °C y 1,000 °C. La materia prima se expuso a la difracción y a la fluorescencia de los rayos X (XRD) y X (XRF), respectivamente, así como a la fisisorción de nitrógeno. Mediante la fluorescencia de los rayos X se vio que las muestras de arcilla mexicana están compuestas principalmente por óxidos que contienen silicio, aluminio, hierro, calcio y potasio. A través de la fisisorción de nitrógeno de la arcilla calcinada, se comprobó que es un material mesoporoso, por presentar una distribución unimodal; el diámetro del poro promedio es de 3.42 nm y el área superficial específica de 48.8 m²/g; con el tratamiento térmico hubo cambios químicos que fueron detectados y analizados por difracción de rayos X (XRD). La membrana estuvo además sujeta a la fisisorción de nitrógeno y microscopía electrónica de barrido (SEM). Los resultados de estas técnicas corroboraron que se puede emplear en los procesos de filtración y con la capacidad de eliminar más del 40% de la dureza del agua.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[mexican clay]]></kwd>
<kwd lng="en"><![CDATA[membrane]]></kwd>
<kwd lng="en"><![CDATA[filtration]]></kwd>
<kwd lng="en"><![CDATA[sintering]]></kwd>
<kwd lng="en"><![CDATA[water hardness]]></kwd>
<kwd lng="es"><![CDATA[arcilla mexicana]]></kwd>
<kwd lng="es"><![CDATA[filtración]]></kwd>
<kwd lng="es"><![CDATA[membrana]]></kwd>
<kwd lng="es"><![CDATA[sinterización]]></kwd>
<kwd lng="es"><![CDATA[dureza del agua]]></kwd>
</kwd-group>
</article-meta>
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