2011
DOI: 10.1016/j.micromeso.2010.10.020
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Liquid phase calorimetric-adsorption analysis of Si-MCM-41: Evidence of strong hydrogen-bonding sites

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Cited by 36 publications
(16 citation statements)
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“…The obtained results indicated that pure SBA-15 showed effective adsorption only at a low pH, while adsorption became insignificant at a neutral pH. The authors suggested that this decrease in adsorption efficiency could be caused by the repulsive ionic interactions preventing the removal, since at a higher pH, glyphosate is ionized, while SBA-15 surface is expected to become negatively charged [139]. At a low pH, partial retention was observed.…”
Section: Other Groups Of Pesticidesmentioning
confidence: 96%
“…The obtained results indicated that pure SBA-15 showed effective adsorption only at a low pH, while adsorption became insignificant at a neutral pH. The authors suggested that this decrease in adsorption efficiency could be caused by the repulsive ionic interactions preventing the removal, since at a higher pH, glyphosate is ionized, while SBA-15 surface is expected to become negatively charged [139]. At a low pH, partial retention was observed.…”
Section: Other Groups Of Pesticidesmentioning
confidence: 96%
“…Algumas das moléculas de piridina podem ser ligadas à superfície externa das diferentes amostras, as quais apresentam uma variedade de morfologias. No entanto, para as sílicas aqui estudadas, todas as entalpias dos locais mais fortes foram maiores que o da sílica gel, o que confirmou um estudo anterior para a MCM-41 (BRAGA et al, 2011). Esses valores indicam um ambiente de grupo silanol altamente polar dentro dos canais das sílicas mesoporosas, que provavelmente expõe os grupos hidroxila nas paredes mesoporosas devido à rigidez de sua estrutura.…”
Section: Resultsunclassified
“…Isso concordou com a literatura (CHRONISTER e DRAGO, 1993;BRAGA et al, 2011), que atribuiu essas bandas como diferentes grupos Si-OH na superfície. Quando isolados, estes são ácidos mais fracos em comparação com os grupos em ponte, que têm pelo menos três grupos silanóis sendo compartilhados.…”
Section: Resultsunclassified
“…No que se refere ao estudo da acidez, as sílicas mesoporosas foram analisadas por: (YANG et al, 2004;BRAGA et al, 2011). Tabela 3.…”
Section: Caracterização Das Sílicas Mesoporosasunclassified