2005
DOI: 10.1021/la0476985
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Abstract: The adsorption isotherms of catechol (1,2-dihydroxybenzene) and gallic acid (3,4,5-trihydroxybenzoic acid) onto titanium dioxide (Degussa P-25) were measured at various pH values and room temperature using attenuated total reflection Fourier transform infrared (FTIR-ATR) data, processed by singular value decomposition. The affinity is largely pH independent, although the deprotonatation of the carboxylic group in gallic acid might produce a slight increase in the affinity. Catechol was shown to form two comple… Show more

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Cited by 152 publications
(175 citation statements)
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“…This single fact shows that the carboxylic groups of GA are not involved directly in GA bonding to MNPs, which is in line with the findings in Ref. [23]. The electrokinetic potential of the GA-coated MNPs changes with time, as it is presented in Fig.…”
Section: The Effect Of Different Organic Acids On Particle Charge Of supporting
confidence: 91%
See 1 more Smart Citation
“…This single fact shows that the carboxylic groups of GA are not involved directly in GA bonding to MNPs, which is in line with the findings in Ref. [23]. The electrokinetic potential of the GA-coated MNPs changes with time, as it is presented in Fig.…”
Section: The Effect Of Different Organic Acids On Particle Charge Of supporting
confidence: 91%
“…The neighboring carboxylates in PAA belong to every second C atom of the backbone of polyacid chain, a geometrically unfavorable condition for Fe-carboxylate formation. In the case of GA, the high adsorption affinity can result from -electron interactions with the polar surface of the MNPs, as well as from complex bond formation at Fe-OH sites with the participation of two neighboring phenolic OH groups of GA [23]. It should be noted that although the shape of the PAA, CA and GA isotherms may look somewhat similar at low equilibrium concentrations, the high-affinity part is definitely absent from the PAA isotherm.…”
Section: Adsorption Of Carboxylic Acids On Magnetite Nanoparticlesmentioning
confidence: 99%
“…The high adsorption affinity of GA can result from complex bond formation of neighbouring phenolic OH groups with the ≡Fe-OH sites [25], as well as from π-electron interactions with the polar surface of the MNPs. The FTIR spectra in Fig.…”
Section: Adsorption Of Polyacidsmentioning
confidence: 99%
“…Adsorption constant and maximum adsorbable quantity obtained for chlorendic acid at 20 o C were (0.12 ± 0.03) l/mg and (4.4 ± 0.2) mg/g TiO 2 4. Temperature increase from [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40] o C reduces adsorption of chlorendic acid onto TiO 2 (P-25). 5.…”
Section: Resultsmentioning
confidence: 99%
“…The L2-type isotherms are usually associated with the adsorption of ionic chemicals in water (e.g. metal cations, phenols, reactive dyes) [20][21][22][23][24][25]. The linear graph (Figure 4) with correlation coefficient of 0.9998 obtained for the adsorption chlorendic acid onto TiO 2 indicates that the data obtained fits the Langmuir-Hinshelwood adsorption model well.…”
Section: Adsorptionmentioning
confidence: 88%