<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Sfaksi, Z</style></author><author><style face="normal" font="default" size="100%">Azzouz, N</style></author><author><style face="normal" font="default" size="100%">Abdelwahab, A</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Biosorption of Cr (VI) from water by cork waste</style></title><secondary-title><style face="normal" font="default" size="100%">Arabian Journal of Chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Biosorption</style></keyword><keyword><style  face="normal" font="default" size="100%">Cork waste</style></keyword><keyword><style  face="normal" font="default" size="100%">Cr(VI)</style></keyword><keyword><style  face="normal" font="default" size="100%">Heavy metals</style></keyword><keyword><style  face="normal" font="default" size="100%">Kinetics</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">King Saud University</style></publisher><isbn><style face="normal" font="default" size="100%">0021334501</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The biosorption by cork powder is considered as a promising method for heavy metal removal from industrial waste waters such as chromium tanning factories. The aim of this study is to evaluate the efficiency extent of this method using a cork powder as biosorbent for Cr(VI). The Fourier Transform Infrared spectroscopy (FTIR) analysis permits to distinguish the type of functional groups likely to participate in metal binding. A linear form of BET isotherms for all the three used temperatures (i.e. 25, 35 and 45°C) and a pseudo-second-order equation of adsorption kinetics are obtained. Other experimental results highlight the meaningful influence of parameters such as contact time, pH, concentration of Cr(VI) and the adsorbent particle size on Cr(VI) adsorption . 97% of Cr(VI) has been removed under definite conditions particularly a particle size of diameter d &lt; 0.08 mm and pH of 2-3 values.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Correia dos Santos, Margarida Maria</style></author><author><style face="normal" font="default" size="100%">Alves, Sheila</style></author><author><style face="normal" font="default" size="100%">de Lurdes Simões Gonçalves, Maria</style></author><author><style face="normal" font="default" size="100%">Correia dos Santos, Margarida Maria</style></author><author><style face="normal" font="default" size="100%">Alves, Sheila</style></author><author><style face="normal" font="default" size="100%">de Lurdes Simões Gonçalves, Maria</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Kinetics and Mechanism of Ni(II) Chelation in Model and Real Solutions of Xylem Sap of Quercus ilex</style></title><secondary-title><style face="normal" font="default" size="100%">Electroanalysis</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">10</style></keyword><keyword><style  face="normal" font="default" size="100%">1002</style></keyword><keyword><style  face="normal" font="default" size="100%">200703972</style></keyword><keyword><style  face="normal" font="default" size="100%">Complexation</style></keyword><keyword><style  face="normal" font="default" size="100%">Cyclic voltammetry</style></keyword><keyword><style  face="normal" font="default" size="100%">doi</style></keyword><keyword><style  face="normal" font="default" size="100%">elan</style></keyword><keyword><style  face="normal" font="default" size="100%">Kinetics</style></keyword><keyword><style  face="normal" font="default" size="100%">Nickel</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">Xylem sap</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year></dates><publisher><style face="normal" font="default" size="100%">WILEY-VCH Verlag</style></publisher><volume><style face="normal" font="default" size="100%">19</style></volume><pages><style face="normal" font="default" size="100%">2351-2361</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The kinetics of formation and dissociation of Ni(II) complexes with oxalic and citric acids was studied by cyclic voltammetry in model solutions of xylem sap of Q. ilex (the dominant tree growing on serpentine soils of Northeast Portugal) using representative concentrations, pH and ionic strength. The role of magnesium on complex formation was analyzed from solutions where Mg is present at concentration levels found in the xylem sap of Q. ilex growing on both nonserpentine and serpentine soils. Kinetics studies were also done in diluted solutions of real xylem sap samples, spiked with increasing amounts of magnesium. The values obtained for the apparent rate constants were those anticipated by the proposed model. To test the validity of the methodology and mechanisms, formation rate constants, kf (M−1 s−1) of Ni(II) complexes with citrate and oxalate were evaluated that compare with the values from Eigen mechanism.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Correia dos Santos, Margarida Maria</style></author><author><style face="normal" font="default" size="100%">Alves, Sheila</style></author><author><style face="normal" font="default" size="100%">de Lurdes Simões Gonçalves, Maria</style></author><author><style face="normal" font="default" size="100%">Correia dos Santos, Margarida Maria</style></author><author><style face="normal" font="default" size="100%">Alves, Sheila</style></author><author><style face="normal" font="default" size="100%">de Lurdes Simões Gonçalves, Maria</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Kinetics and Mechanism of Ni(II) Chelation in Model and Real Solutions of Xylem Sap of Quercus ilex</style></title><secondary-title><style face="normal" font="default" size="100%">Electroanalysis</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">10</style></keyword><keyword><style  face="normal" font="default" size="100%">1002</style></keyword><keyword><style  face="normal" font="default" size="100%">200703972</style></keyword><keyword><style  face="normal" font="default" size="100%">Complexation</style></keyword><keyword><style  face="normal" font="default" size="100%">Cyclic voltammetry</style></keyword><keyword><style  face="normal" font="default" size="100%">doi</style></keyword><keyword><style  face="normal" font="default" size="100%">elan</style></keyword><keyword><style  face="normal" font="default" size="100%">Kinetics</style></keyword><keyword><style  face="normal" font="default" size="100%">Nickel</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">Xylem sap</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2007</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2007///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://dx.doi.org/10.1002/elan.200703972http://doi.wiley.com/10.1002/elan.200703972</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">19</style></volume><pages><style face="normal" font="default" size="100%">2351 - 2361</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The kinetics of formation and dissociation of Ni(II) complexes with oxalic and citric acids was studied by cyclic voltammetry in model solutions of xylem sap of Q. ilex (the dominant tree growing on serpentine soils of Northeast Portugal) using representative concentrations, pH and ionic strength. The role of magnesium on complex formation was analyzed from solutions where Mg is present at concentration levels found in the xylem sap of Q. ilex growing on both nonserpentine and serpentine soils. Kinetics studies were also done in diluted solutions of real xylem sap samples, spiked with increasing amounts of magnesium. The values obtained for the apparent rate constants were those anticipated by the proposed model. To test the validity of the methodology and mechanisms, formation rate constants, kf (M−1 s−1) of Ni(II) complexes with citrate and oxalate were evaluated that compare with the values from Eigen mechanism.</style></abstract><issue><style face="normal" font="default" size="100%">22</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: WILEY-VCH Verlag</style></notes></record></records></xml>