"Kostura, Bruno" . "5"^^ . "[4AF0273CC8B4]" . "27360" . "Mat\u00FDsek, Dalibor" . "11" . "Le\u0161ko, Juraj" . "V" . "Mechanismy sorpce fosf\u00E1t\u016F z vodn\u00FDch roztok\u016F kalcinovanou formou Mg-Al-CO3 hydrotalcitu." . "000297567400009" . . . . "RIV/61989100:27360/11:86079832!RIV12-MSM-27360___" . "Mechanisms of Phosphate Sorption from Aqueous Solutions by Calcined Mg-Al-CO3 Hydrotalcite."@en . "V t\u00E9to pr\u00E1ci byla studov\u00E1na rehydratace kalcinovan\u00E9 formy komer\u010Dn\u00EDho Mg-Al-CO3 hydrotalcitu s mol\u00E1rn\u00EDm pom\u011Brem Mg/Al 2:1 v p\u0159\u00EDtomnosti fosf\u00E1t\u016F. Sorp\u010Dn\u00ED kapacita vzorku \u010Din\u00ED 89.3 mg P/g, sorpce vyhovuje Langmuirov\u011B izoterm\u011B a lze ji charakterizovat kinetick\u00FDm modelem pseudodruh\u00E9ho \u0159\u00E1du. Vysok\u00E1 sorp\u010Dn\u00ED kapacita kalcinovan\u00E9ho hydrotalcitu je zp\u016Fsobena r\u016Fzn\u00FDmi sorp\u010Dn\u00EDmi mechanizmy. Kinetick\u00E9 testy prok\u00E1zaly existenci dvou krok\u016F \u2013 rychl\u00E9ho a pomal\u00E9ho. Rychl\u00FD krok \u2013 rehydratace sm\u011Bsn\u00E9ho oxidu za vzniku hydroxidov\u00E9 formy hydrotalcitu doprov\u00E1zen\u00E1 povrchovou sorpc\u00ED fosf\u00E1t\u016F \u2013 se uplat\u0148uje v po\u010D\u00E1te\u010Dn\u00EDch 90 a\u017E 120 minut\u00E1ch, jeho rychlost je \u0159\u00EDzena intrapartikul\u00E1rn\u00ED difuz\u00ED. Pokud je v roztoku p\u0159\u00EDtomen nadbytek fosf\u00E1t\u016F, n\u00E1sleduje pomal\u00FD krok \u2013 interkalace fosf\u00E1t\u016F do mezivrstv\u00ED uskute\u010D\u0148ovan\u00E1 jako iontov\u00E1 v\u00FDm\u011Bna s anionty OH-. V tomto kroku nelze vylou\u010Dit ani precipitaci hlinit\u00FDch fosf\u00E1t\u016F. D\u011Bje prob\u00EDhaj\u00EDc\u00ED v pomal\u00E9m kroku p\u016Fsob\u00ED negativn\u011B na strukturn\u00ED pam\u011B\u0165ov\u00FD efekt kalcinovan\u00E9ho hydrotalcitu." . . . . "Chemick\u00E9 listy" . "V t\u00E9to pr\u00E1ci byla studov\u00E1na rehydratace kalcinovan\u00E9 formy komer\u010Dn\u00EDho Mg-Al-CO3 hydrotalcitu s mol\u00E1rn\u00EDm pom\u011Brem Mg/Al 2:1 v p\u0159\u00EDtomnosti fosf\u00E1t\u016F. Sorp\u010Dn\u00ED kapacita vzorku \u010Din\u00ED 89.3 mg P/g, sorpce vyhovuje Langmuirov\u011B izoterm\u011B a lze ji charakterizovat kinetick\u00FDm modelem pseudodruh\u00E9ho \u0159\u00E1du. Vysok\u00E1 sorp\u010Dn\u00ED kapacita kalcinovan\u00E9ho hydrotalcitu je zp\u016Fsobena r\u016Fzn\u00FDmi sorp\u010Dn\u00EDmi mechanizmy. Kinetick\u00E9 testy prok\u00E1zaly existenci dvou krok\u016F \u2013 rychl\u00E9ho a pomal\u00E9ho. Rychl\u00FD krok \u2013 rehydratace sm\u011Bsn\u00E9ho oxidu za vzniku hydroxidov\u00E9 formy hydrotalcitu doprov\u00E1zen\u00E1 povrchovou sorpc\u00ED fosf\u00E1t\u016F \u2013 se uplat\u0148uje v po\u010D\u00E1te\u010Dn\u00EDch 90 a\u017E 120 minut\u00E1ch, jeho rychlost je \u0159\u00EDzena intrapartikul\u00E1rn\u00ED difuz\u00ED. Pokud je v roztoku p\u0159\u00EDtomen nadbytek fosf\u00E1t\u016F, n\u00E1sleduje pomal\u00FD krok \u2013 interkalace fosf\u00E1t\u016F do mezivrstv\u00ED uskute\u010D\u0148ovan\u00E1 jako iontov\u00E1 v\u00FDm\u011Bna s anionty OH-. V tomto kroku nelze vylou\u010Dit ani precipitaci hlinit\u00FDch fosf\u00E1t\u016F. D\u011Bje prob\u00EDhaj\u00EDc\u00ED v pomal\u00E9m kroku p\u016Fsob\u00ED negativn\u011B na strukturn\u00ED pam\u011B\u0165ov\u00FD efekt kalcinovan\u00E9ho hydrotalcitu."@cs . "RIV/61989100:27360/11:86079832" . . . "hydrotalcite, calcination, rehydration, phosphate sorption"@en . . "2"^^ . "Mechanismy sorpce fosf\u00E1t\u016F z vodn\u00FDch roztok\u016F kalcinovanou formou Mg-Al-CO3 hydrotalcitu."@cs . . . . . . . "3"^^ . . "CZ - \u010Cesk\u00E1 republika" . "Mechanisms of Phosphate Sorption from Aqueous Solutions by Calcined Mg-Al-CO3 Hydrotalcite."@en . "105" . "211308" . "The study deals with rehydation of calcined form of the commercially available Mg-Al-CO3 hydrotalcite (Mg/Al molar ratio 2:1) occuring in the presence of phosphate ions. The sorption process follows the Langmuir isotherm and may be characterized by the kinetic model of pseudo-second order. The sorption capacity of the calcined hydrotalcite (89.3 mg P/g) is given by various sorption mechanisms. Kinetic tests proved existence of two steps \u2013 fast and slow one. The fast step is represented by rehydration of the mixed oxide leading to the formation of hydroxide form of hydrotalcite associated with surface sorption of phosphates. This step runs within first 90 \u2013 120 minutes and its rate is driven by the intraparticular difussion. However, if an excess of phosphates is present in the solution, the slow step proceeds, i.e. intercalation of phosphate ions into interlayer space carried out as the ion exchange with OH- anions. Precipitation of aluminium phosphates may also occur within the slow step. The slow step processes have negative impact on the structure memory effect of the calcined hydrotalcite."@en . "Mechanismy sorpce fosf\u00E1t\u016F z vodn\u00FDch roztok\u016F kalcinovanou formou Mg-Al-CO3 hydrotalcitu."@cs . "0009-2770" . . "Mechanismy sorpce fosf\u00E1t\u016F z vodn\u00FDch roztok\u016F kalcinovanou formou Mg-Al-CO3 hydrotalcitu." .