<?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>2221-2442</journal-id>
<journal-title><![CDATA[Revista CENIC Ciencias Químicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. CENIC Cienc. Quím.]]></abbrev-journal-title>
<issn>2221-2442</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Investigaciones Científicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2221-24422022000100001</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Removal of Methyl Violet from Aqueous solutions using Sr2ANbO5.5 (A= Ca+2, Sr+2 &amp; Ba+2)]]></article-title>
<article-title xml:lang="es"><![CDATA[Eliminación de violeta de metilo de soluciones acuosas utilizando Sr2ANbO5.5 (A= Ca+2, Sr+2 &amp; Ba+2)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alnaas]]></surname>
<given-names><![CDATA[Maryam. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Awin]]></surname>
<given-names><![CDATA[Labib. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[El-Rais]]></surname>
<given-names><![CDATA[Mahmoud. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Etorki]]></surname>
<given-names><![CDATA[Abdunnaser M]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ezrgane]]></surname>
<given-names><![CDATA[Moda. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tripoli University Faculty of Science Chemistry Department]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Libya</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Gharyan University Faculty of Science Chemistry Department]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Libya</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2022</year>
</pub-date>
<volume>53</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>11</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S2221-24422022000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S2221-24422022000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S2221-24422022000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Three members of the A-site doped Nb perovskites with general formula Sr2CaNbO5.5, Sr3NbO5.5 and BaSr2NbO5.5 were synthesised by solid-state methods and their removal efficiency of Methyl violet from aqueous solutions investigated. The X-ray diffraction measurements demonstrated that the three samples have a faced cubic perovskite-type structure in space group Fm3m. The additions of Ba2+ and Ca2+ into the A-site of Sr3NbO5.5 have influenced the cell volume, crystal size and density. Subsequently, the removal capacity was also impacted. The crystallite size of the three oxides was calculated to be less than 82 nm. The maximum removal capacities of Methyl violet are found to be 46.5, 13.1 and 8.0 mg/g using BaSr2NbO5.5, Sr3NbO5.5 and CaSr2NbO5.5, respectively. The amounts of the adsorbed dye have decreased as the ionic radii of the doped decreased. The removals of Methyl violet have a positive relationship with pH, temperature and the mass of the oxides.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Tres miembros de las perovskitas de Nb dopadas en el sitio A con la fórmula general Sr2CaNbO5.5, Sr3NbO5.5 y BaSr2NbO5.5 se sintetizaron mediante métodos de estado sólido y se investigó su eficiencia de eliminación de violeta de metilo de soluciones acuosas. Las mediciones de difracción de rayos X demostraron que las tres muestras tienen una estructura de tipo perovskita cúbica enfrentada en el grupo espacial Fm3 &#773;m. Las adiciones de Ba2+ y Ca2+ en el sitio A de Sr3NbO5.5 han influido en el volumen celular, el tamaño del cristal y la densidad. Posteriormente, la capacidad de remoción también se vio afectada. Se calculó que el tamaño de los cristalitos de los tres óxidos era inferior a 82 nm. Las capacidades máximas de eliminación de violeta de metilo son de 46,5, 13,1 y 8,0 mg/g utilizando BaSr2NbO5,5, Sr3NbO5,5 y CaSr2NbO5,5, respectivamente. Las cantidades del colorante adsorbido han disminuido a medida que disminuían los radios iónicos del dopado. Las remociones de violeta de metilo tienen una relación positiva con el pH, la temperatura y la masa de los óxidos.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Removal]]></kwd>
<kwd lng="en"><![CDATA[Methyl violet]]></kwd>
<kwd lng="en"><![CDATA[A-site Doping]]></kwd>
<kwd lng="es"><![CDATA[Eliminación]]></kwd>
<kwd lng="es"><![CDATA[violeta de metilo]]></kwd>
<kwd lng="es"><![CDATA[dopaje en el sitio A]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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