<?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>S0188-49992017000200269</article-id>
<article-id pub-id-type="doi">10.20937/rica.2017.33.02.08</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[BIOADSORCIÓN DE PLOMO (II) PRESENTE EN SOLUCIÓN ACUOSA SOBRE RESIDUOS DE FIBRAS NATURALES PROCEDENTES DE LA INDUSTRIA IXTLERA ( Agave lechuguilla Torr. Y Yucca carnerosana (Trel.) McKelvey)]]></article-title>
<article-title xml:lang="en"><![CDATA[BIOSORPTION OF LEAD (II) IN AQUEOUS SOLUTION ONTO RESIDUES OF NATURAL FIBERS FROM THE IXTLE INDUSTRY (Agave lechuguilla Torr. AND Yucca carnerosana (Trel.) MCKELVEY)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Medellín-Castillo]]></surname>
<given-names><![CDATA[Nahum Andrés]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Ramírez]]></surname>
<given-names><![CDATA[Miriam Giovana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salazar-Rábago]]></surname>
<given-names><![CDATA[Jacob Josafat]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Labrada-Delgado]]></surname>
<given-names><![CDATA[Gladis Judith]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aragón-Piña]]></surname>
<given-names><![CDATA[Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Centro de Investigación y Estudios de Posgrado Facultad de Ingeniería]]></institution>
<addr-line><![CDATA[San Luis Potosí San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Centro de Investigación y Estudios de Posgrado Facultad de Ciencias Químicas]]></institution>
<addr-line><![CDATA[San Luis Potosí San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto Potosino de Investigación Científica y Tecnológica  ]]></institution>
<addr-line><![CDATA[San Luis Potosí San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Metalurgía ]]></institution>
<addr-line><![CDATA[San Luis Potosí San Luis Potosí]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>269</fpage>
<lpage>280</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992017000200269&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992017000200269&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992017000200269&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El plomo ha sido reconocido como uno de los metales más tóxicos por su efecto negativo sobre el ambiente. En el presente trabajo se evaluó el uso potencial de residuos de Agave lechuguilla Torr. (lechuguilla) y Yucca carnerosana (Trel.) McKelvey (yuca) procedentes de la industria ixtlera para remover iones Pb (II) presentes en solución acuosa. Los datos del equilibrio de bioadsorción mostraron que al aumentar el pH de la solución de 2.0 a 5.0, la capacidad de bioadsorción de ambos materiales se incrementa. Este efecto se explicó considerando que la carga superficial negativa de estos materiales es mayor al aumentar el pH y por ello se favorece la remoción de Pb (II). El efecto de la temperatura de la solución en las isotermas de bioadsorción, expuso la naturaleza endotérmica del proceso. La energía libre de Gibbs y la entropía calculada (&#916;G° y &#916;S°) indicaron la espontaneidad de la bioadsorción y la afinidad del Pb (II) en solución por los bioadsorbentes, respectivamente. La variación de las capacidades de bioadsorción de la lechuguilla y la yuca se atribuyó a la diferencia en el contenido de sitios ácidos y lignina, lo que condujo a la presencia de diversos mecanismos de bioadsorción. En ambos materiales, la bioadsorción de Pb (II) ocurre por los mecanismos de interacciones &#960;-catión, atracciones electrostáticas e intercambio iónico; además en el caso de la lechuguilla se evidenció un proceso de microprecipitación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Lead has been recognized as one of the most toxic metals due to its negative effect on the environment. In the present work, the potential use of Agave lechuguilla Torr. (lechuguilla) and Yucca carnerosana (Trel.) McKelvey (yucca) residues from the ixtle industry to remove Pb (II) ions in an aqueous solution was evaluated. The adsorption equilibrium data showed that when increasing the pH in the solution from 2.0 to 5.0, the biosorption capacity of both materials increases. This effect might be explained by the negative surface charge of these materials, which is greater at high pH, favoring the removal of Pb (II). The effect of the temperature of the solution on the biosorption isotherms revealed the endothermic nature of the biosorption process. The Gibbs free energy change and the calculated entropy (&#916;G° and &#916;S°) indicated the spontaneity of biosorption and the affinity of Pb (II) in the solution for biosorbents, respectively. The variation of the biosorption capacities of lechuguilla and yucca was attributed to the different content of acid sites and lignin, which resulted in the presence of different biosorption mechanisms. In both materials, the biosorption of Pb (II) occurs by &#960;-cation interactions, electrostatic attractions and ion exchange; moreover, a microprecipitation process on lechuguilla was evinced.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[materiales lignocelulósicos]]></kwd>
<kwd lng="es"><![CDATA[mecanismo de bioadsorción]]></kwd>
<kwd lng="es"><![CDATA[sitios activos]]></kwd>
<kwd lng="es"><![CDATA[microprecipitación]]></kwd>
<kwd lng="en"><![CDATA[lignocellulosic materials]]></kwd>
<kwd lng="en"><![CDATA[biosorption mechanism]]></kwd>
<kwd lng="en"><![CDATA[active sites]]></kwd>
<kwd lng="en"><![CDATA[microprecipitation]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Biosorption of aqueous chromium (VI) by Tamarindus indica seeds]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Agarwal]]></surname>
<given-names><![CDATA[G.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Bhuptawat]]></surname>
<given-names><![CDATA[H.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Chaudhari]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biores. Technol.]]></source>
<year>2006</year>
<volume>97</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>949-56</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Official methods of analysis]]></article-title>
<collab>AOAC</collab>
<source><![CDATA[Association of Official Analytical Chemists]]></source>
<year>1990</year>
<page-range>1230</page-range><publisher-loc><![CDATA[Washington, D.C., EUA ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Characterization of water bamboo husk biosorbents and their application in heavy metal ion trapping]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Asberry]]></surname>
<given-names><![CDATA[H.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Kuo]]></surname>
<given-names><![CDATA[C-Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Gung]]></surname>
<given-names><![CDATA[C-H.]]></given-names>
</name>
<name>
<surname><![CDATA[Suen]]></surname>
<given-names><![CDATA[S-Y.]]></given-names>
</name>
</person-group>
<source><![CDATA[Microchem. J.]]></source>
<year>2014</year>
<volume>113</volume>
<page-range>59-63</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Equilibrium biosorption of lead(II) from aqueous solution by solid waste from olive-oil production]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Blázquez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Calero]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernáinz]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Tenorio]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Martín]]></surname>
<given-names><![CDATA[M.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Chem. Eng. J.]]></source>
<year>2010</year>
<volume>160</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>615-22</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Some aspects of the surface chemistry of carbon blacks and other carbons]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Boehm]]></surname>
<given-names><![CDATA[H.P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Carbon]]></source>
<year>1994</year>
<volume>32</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>759-69</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Conesa]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Curso básico de análisis térmico]]></source>
<year>2000</year>
<edition>1a</edition>
<page-range>105</page-range><publisher-loc><![CDATA[Alicante, España ]]></publisher-loc>
<publisher-name><![CDATA[Club Universitario]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Heavy metal adsorption onto agro-based waste materials: A review]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Demirbas]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Hazard. Mater.]]></source>
<year>2008</year>
<volume>157</volume>
<numero>2-3</numero>
<issue>2-3</issue>
<page-range>220-9</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Do]]></surname>
<given-names><![CDATA[D.D.]]></given-names>
</name>
</person-group>
<source><![CDATA[Adsorption analysis: Equilibria and kinetics]]></source>
<year>1998</year>
<edition>1a</edition>
<page-range>892</page-range><publisher-loc><![CDATA[Londres, Reino Unido ]]></publisher-loc>
<publisher-name><![CDATA[Imperial College Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Cation-&#960; interactions in structural biology]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gallivan]]></surname>
<given-names><![CDATA[J.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Dougherty]]></surname>
<given-names><![CDATA[D.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Proc. Natl. Acad. Sci. USA]]></source>
<year>1999</year>
<volume>96</volume>
<numero>17</numero>
<issue>17</issue>
<page-range>9459-64</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Kinetic and isotherm modeling of lead (II) sorption onto some waste plant materials]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gupta]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Gaur]]></surname>
<given-names><![CDATA[J.P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Chem. Eng. J.]]></source>
<year>2009</year>
<volume>148</volume>
<numero>2-3</numero>
<issue>2-3</issue>
<page-range>226-33</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Sorption of Cd (II) and Pb (II) from aqueous solutions onto Agave americana fibers]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hamissa]]></surname>
<given-names><![CDATA[A.M.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Lodi]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Seffen]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Finocchio]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Botter]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Converti]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Chem. Eng. J.]]></source>
<year>2010</year>
<volume>159</volume>
<numero>1-3</numero>
<issue>1-3</issue>
<page-range>67-74</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Heavy metal adsorbents prepared from the modification of cellulose]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[O&#8217;Connell]]></surname>
<given-names><![CDATA[D.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Birkinshaw]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[O&#8217;Dwyer]]></surname>
<given-names><![CDATA[T.F.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biores. Technol.]]></source>
<year>2008</year>
<volume>99</volume>
<numero>15</numero>
<issue>15</issue>
<page-range>6709-24</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pavia]]></surname>
<given-names><![CDATA[D.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Lampman]]></surname>
<given-names><![CDATA[G.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Kriz]]></surname>
<given-names><![CDATA[G.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Vyvyan]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Introduction to spectroscopy]]></source>
<year>2015</year>
<edition>5a</edition>
<page-range>784</page-range><publisher-loc><![CDATA[California, EUA ]]></publisher-loc>
<publisher-name><![CDATA[Cengage Learning]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Adsorption of several metal ions onto a low cost biosorbent: Kinetic and equilibrium studies]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Reddad]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Gerente]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Andres]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Le Cloirec]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Environ. Sci. Technol.]]></source>
<year>2002</year>
<volume>36</volume>
<numero>9</numero>
<issue>9</issue>
<page-range>2067-73</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Adsorption of Cr(III) on ozonised activated carbon. Importance of Cpi-cation interactions]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rivera]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Sánchez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Wat. Res.]]></source>
<year>2003</year>
<volume>37</volume>
<numero>14</numero>
<issue>14</issue>
<page-range>3335-40</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Determination of thermodynamic parameters of Cr(VI) adsorption from aqueous solution onto Agave lechuguilla biomass]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Peralta]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramirez]]></surname>
<given-names><![CDATA[S.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Gardea]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Chem. Thermodynamics]]></source>
<year>2005</year>
<volume>37</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>343-7</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Potential of Agave lechuguillabiomass for Cr(III) removal from aqueous solutions: Thermodynamics studies]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Peralta]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodriguez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Delgado]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Gardea]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biores. Technol.]]></source>
<year>2006</year>
<volume>97</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>178-82</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Modeling the adsorption of Cr(III) from aqueous solution onto Agave lechuguilla biomasss: Study of the advective and dispersive transport]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Walton]]></surname>
<given-names><![CDATA[J.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Peralta]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
<name>
<surname><![CDATA[Rodríguez]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Gardea]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Hazard. Mater.]]></source>
<year>2009</year>
<volume>161</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>360-5</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Modelación del proceso de transferencia de masa en columnas de lecho fijo de la bioadsorción del Cr(VI) usando transformadas de Laplace]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[J.L.]]></given-names>
</name>
<name>
<surname><![CDATA[Velázquez]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Maldonado]]></surname>
<given-names><![CDATA[A.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Canales]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Romero]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[CULCyT]]></source>
<year>2010</year>
<volume>41</volume>
<page-range>106-31</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Novel biosorbent with high adsorption capacity prepared by chemical modification of white pine (Pinus durangensis) sawdust. Adsorption of Pb (II) from aqueous solutions]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Salazar]]></surname>
<given-names><![CDATA[J.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Leyva]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Manag.]]></source>
<year>2016</year>
<volume>169</volume>
<page-range>303-12</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Ethnobotany of Agave lecheguilla and Yucca carnerosana in Mexico&#8217;s zona ixtlera]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sheldon]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Econ. Bot.]]></source>
<year>1980</year>
<volume>34</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>376-90</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Biosorption isotherm and kinetics on removal of Cr(VI) using native and chemically modified Lagerstroemia speciosa bark]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Srivastava]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Agrawal]]></surname>
<given-names><![CDATA[S.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Mondal]]></surname>
<given-names><![CDATA[M.K.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ecol. Eng.]]></source>
<year>2015</year>
<volume>85</volume>
<page-range>56-66</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Agricultural waste material as potential adsorbent for sequestering heavy metal ions from aqueous solution - A review]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Sud]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Mahajan]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaur]]></surname>
<given-names><![CDATA[M.P.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biores. Technol.]]></source>
<year>2008</year>
<volume>99</volume>
<numero>14</numero>
<issue>14</issue>
<page-range>6017-27</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Biosorption of lead(II) ions from aqueous solution by peanut shells: Equilibrium thermodynamic and kinetic studies]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Ta&#351;ar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Kaya]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[&#1254;zer]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[J. Environ. Chem. Eng.]]></source>
<year>2014</year>
<volume>2</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>1018-26</page-range></nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Chemical characterization of raw and treated agave bagasse and its potential as adsorbent of metal cations from water]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Velazquez]]></surname>
<given-names><![CDATA[L.H.]]></given-names>
</name>
<name>
<surname><![CDATA[Pavlick]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Rangel]]></surname>
<given-names><![CDATA[J.R.]]></given-names>
</name>
</person-group>
<source><![CDATA[Ind. Crop. Prod.]]></source>
<year>2013</year>
<volume>43</volume>
<page-range>200-6</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Cellulose derivatives from cellulosic material isolated from Agave lechuguilla and fourcroydes]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Vieira]]></surname>
<given-names><![CDATA[M.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Th.]]></surname>
<given-names><![CDATA[Heinze]]></given-names>
</name>
<name>
<surname><![CDATA[Cruz]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Mendoza]]></surname>
<given-names><![CDATA[A.M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cellulose]]></source>
<year>2002</year>
<volume>9</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>203-12</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<article-title xml:lang=""><![CDATA[Removal of heavy metal ions from wastewater by chemically modified plant wastes as adsorbents: A review]]></article-title>
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wan]]></surname>
<given-names><![CDATA[W.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Hanafiah]]></surname>
<given-names><![CDATA[M.A.K.M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Biores. Technol.]]></source>
<year>2008</year>
<volume>99</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>3935-48</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
