<?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>S0188-49992025000100105</article-id>
<article-id pub-id-type="doi">10.20937/rica.55102</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Fluoride removal from aqueous solutions by spherical agglomeration using aluminum hydroxide and Agave salmiana extract]]></article-title>
<article-title xml:lang="es"><![CDATA[Remoción de flúor en soluciones acuosas por aglomeración esférica utilizandohidróxido de aluminio y extracto de Agave salmiana]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcázar-Medina]]></surname>
<given-names><![CDATA[Félix Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Núñez-Núñez]]></surname>
<given-names><![CDATA[Cynthia Manuela]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valle-Cervantes]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Proal-Nájera]]></surname>
<given-names><![CDATA[José Bernardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tecnológico Nacional de México Departamento de Ingenierías Química y Bioquímica ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Secretaría de Ciencia, Humanidades, Tecnología e Innovación  ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Politécnica de Durango Ingeniería en Tecnología Ambiental ]]></institution>
<addr-line><![CDATA[Durango ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[Durango Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>41</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992025000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992025000100105&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992025000100105&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Groundwater contamination with fluoride is one of the most important and serious environmental concerns due to its toxicity. This study aimed to assess spherical agglomeration technique&#8217;s (SAT) efficacy in fluoride removal. Experiments were performed in acrylic containers with baffles to promote particle impacts, using 250 mL of 5.0 mg/L fluoride solution, under 300 rpm agitation, pH of 7, and room temperature. Experiments were started by adding, as fluoride adsorbents, either activated alumina (AA) or freshly prepared aluminum hydroxide (FPAH) in three doses: 0.1, 0.15 and 0.2 g/L. Once best adsorbent was selected, SAT was applied. Hydrophilization of the precipitates was performed by saponin rich Agave salmiana extracts at doses between 0.3 and 0.9 gExt/gPoll. Hydrophobized precipitates were then covered with N-heptane and finally with CaCl2 to neutralize charges and agglomerate precipitates. Best fluoride removal (89.5%) was achieved when FPAH was used in the highest tested dose (0.2 g/L). Regarding agave extract, the lowest dose (0.3 gExt/gPoll) proved the most efficient. Final fluoride concentration in mentioned conditions, resulted within the limits allowed by the regulations established for fluoride. SAT has been successfully applied for the removal of a non-metallic element such as fluoride in aqueous models.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN La contaminación de las aguas subterráneas con fluoruros es una de las preocupaciones ambientales más importantes y serias debido a su toxicidad. Este estudio tuvo como objetivo evaluar la eficacia de la técnica de aglomeración esférica (TAE) en la remoción de fluoruros. Los experimentos se realizaron en contenedores acrílicos con deflectores para promover los impactos de partículas, utilizando 250 mL de solución de flúor de 5.0 mg/L, bajo agitación de 300 rpm, pH de 7 y temperatura ambiente. Los experimentos se iniciaron añadiendo, como adsorbentes de fluoruros, alúmina activada (AA) o hidróxido de aluminio recién preparado (FPAH por su sigla en inglés) en tres dosis: 0.1, 0.15 y 0.2 g/L. Una vez seleccionado el mejor adsorbente, se aplicó la TAE. La hidrofobización de los precipitados se realizó con extractos ricos en saponinas de Agave salmiana a dosis entre 0.3 y 0.9 gExt/gPoll. Los precipitados hidrofobizados se cubrieron luego con N-heptano y finalmente con CaCl2 para neutralizar las cargas y aglomerar los precipitados. La mejor remoción de fluoruro (89.5 %) se logró cuando se utilizó FPAH en la dosis probada más alta (0.2 g/L). Con respecto al extracto de agave, la dosis más baja (0.3 gExt/gPoll) resultó ser la más eficiente. La concentración final de fluoruro en las condiciones mencionadas resultó estar dentro de los límites permitidos por las regulaciones establecidas para el fluoruro. La TAE ha sido empleada con éxito para la eliminación de un elemento no metálico como el fluoruro en modelos acuosos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[precipitation]]></kwd>
<kwd lng="en"><![CDATA[adsorption efficiency]]></kwd>
<kwd lng="en"><![CDATA[biosurfactants]]></kwd>
<kwd lng="en"><![CDATA[humectant]]></kwd>
<kwd lng="es"><![CDATA[precipitación]]></kwd>
<kwd lng="es"><![CDATA[eficiencia de adsorción]]></kwd>
<kwd lng="es"><![CDATA[biosurfactante]]></kwd>
<kwd lng="es"><![CDATA[humectante]]></kwd>
</kwd-group>
</article-meta>
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