2005
DOI: 10.1590/s0100-46702005000400006
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Influence of the synthesis conditions on the characteristics and metal adsorption properties of the 3-(1,4-phenylenediamine)propylsilica xerogel

Abstract: The hybrid 3-(1,4-phenylenediamine)propylsilica xerogel was obtained starting from two different organic precursor quantity (5 and 8 mmol) to 22 mmol of TEOS, in the synthesis. The xerogel samples were characterized by using CHN elemental analysis, N2 adsorption-desorption isotherms, infrared thermal analysis. The xerogel was used as metal sorbent for Cu2+, Cd2+ and Pb2+ in aqueous solution with concentration range of 10-3 to 10-5 mmol l-1. The quantity of organic precursor added in the synthesis influences th… Show more

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Cited by 9 publications
(5 citation statements)
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References 24 publications
(28 reference statements)
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“…For adsorbent dosage higher than 0.4 g the AB129 removal remained almost constant. Increases in the percentage of AB129 removal with adsorbent dosage could be attributed to increases in the adsorbent surface areas, augmenting its number of adsorption sites available for adsorption [ 33 , 34 ]. In order to continue this work, the adsorbent dosage was fixed at 0.4 g, since this adsorbent dosage correspond to the minimum amount of adsorbent which lead to a constant and maximum removal of AB129.…”
Section: Resultsmentioning
confidence: 99%
“…For adsorbent dosage higher than 0.4 g the AB129 removal remained almost constant. Increases in the percentage of AB129 removal with adsorbent dosage could be attributed to increases in the adsorbent surface areas, augmenting its number of adsorption sites available for adsorption [ 33 , 34 ]. In order to continue this work, the adsorbent dosage was fixed at 0.4 g, since this adsorbent dosage correspond to the minimum amount of adsorbent which lead to a constant and maximum removal of AB129.…”
Section: Resultsmentioning
confidence: 99%
“…Further thermal treatment produces organic desorption. The organics can be also identified by the broad band with maximum near 3380 cm −1 attributed to N-H stretching [35]. Additionally, from the infrared analysis of the adsorbents, it was possible to observe that the organic groups interact with the silanol of the silica surface, since the free silanol stretching bands that appear at 3740 cm −1 could be detected only after heating treatment at up to 450 • C, when the organics were already desorbed.…”
Section: Synthesis and Characterization Of Aah Si And Aad Simentioning
confidence: 97%
“…To provide a reliable calculation of stability constants (b i ) and effective sorption capacities (t Q ), two important aspects should be taken into account: (a) Both parameters b i and t Q should be determined from the adsorption isotherms since it is known that great discrepancies between t Q and expected (maximum) capacities found by elemental analysis are often observed [30][31][32][33][34], and the t Q estimations taken from the saturation regions of the isotherms may be substantially understated [35]; (b) b i and t Q values calculated with the use of the commonly used least-squares (LS) technique may be inaccurate if distribution of experimental errors does not correspond to Gauss' law and has tails longer than the density of normal distribution. So, the conventional LS estimations of fitting parameters lose their optimal statistical properties and should be replaced by the robust analogs.…”
Section: Adsorption Equilibriamentioning
confidence: 99%