A study of competitive adsorption of organic molecules onto mineral oxides using DRIFTS

Thomas, Joan E.; Kelley, Michael J.

doi:10.1016/j.jcis.2009.10.031

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Adsorptive interactions between soil minerals and organic compounds are governed by mineral surface structural and charge properties, chemical properties of the organic compounds, solution chemistry (pH, ionic strength and composition) and the presence of competing organic or inorganic compounds (Thomas & Kelley, ; Zhang et al ., ). Many studies have shown that soil minerals can preferentially bind aromatic compounds, thus increasing their turnover time in soil (Kaiser & Guggenberger, ; Kalbitz et al ., ).…”

Section: Introductionmentioning

confidence: 99%

Competition and surface conditioning alter the adsorption of phenolic and amino acids on soil minerals

Gao

Jansen

Cerli

et al. 2017

European J Soil Science

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Summary Adsorptive interactions of organic molecules with soil minerals often impair their bioavailability. However, little is known about the adsorption behaviour of phenolic and nitrogenous compounds on different minerals and their mutual interaction with respect to competition and surface conditioning (i.e. surface modification induced by preceding adsorption of the other class of compounds). Therefore, batch adsorption experiments were done to study the interaction between phenolic acids (PAs; salicylic acid, Sal; syringic acid, Syr; ferulic acid, Fer; vanillic acid, Van) and amino acids (AAs; lysine, Lys; glutamic acid, Glu; leucine, Leu; phenylalanine, Phe) during adsorption on goethite and Ca2+‐montmorillonite at pH 6 by applying adsorbate concentrations of 0.01, 0.05 and 0.1 mm. Larger adsorption of PAs was observed on goethite than montmorillonite, whereas the phyllosilicate was a better adsorbent for AAs than the oxide. Among all tested PAs, Sal was preferentially adsorbed on both minerals. For the AAs, Glu was preferentially adsorbed on goethite and Lys on montmorillonite. The AAs were more competitive than PAs and partially suppressed the adsorption of PAs on both minerals. The adsorption of PAs or AAs on both minerals was enhanced by surface conditioning with the other group, with larger effects for goethite than montmorillonite. For goethite, surface conditioning by PAs enhanced the adsorption of AAs more (by 97–161%) than did AAs for PAs (9–48%). The results support the hypothesis that pre‐adsorption of one class of organic compound can enhance the retention of another class. This suggests that adsorbed organic matter on soil mineral phases might be subject to a self‐strengthening effect. Highlights Phenolic acids (PAs) were preferentially retained on goethite. Amino acids (AAs) were preferentially retained on montmorillonite. AAs were more competitive than PAs for adsorption sites on both minerals. Pre‐adsorption of one class of compound can enhance the retention of another class.

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Section: Introductionmentioning

confidence: 99%

Competition and surface conditioning alter the adsorption of phenolic and amino acids on soil minerals

Gao

Jansen

Cerli

et al. 2017

European J Soil Science

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“…Extensive research has focused on the competitive adsorption between carboxylate and phosphate (sulfate), , two carboxylates, , as well as carboxylate and metal ions. , However, limited knowledge is available for competition mechanisms between carboxylate and phenolic aromatic compounds, especially on the microscopic level. The functional groups determine, in a large extent, the adsorption behaviors of the compounds.…”

Section: Introductionmentioning

confidence: 99%

Molecular-Scale Study of Salicylate Adsorption and Competition with Catechol at Goethite/Aqueous Solution Interface

2013

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Insights into the adsorption mechanisms of salicylate on goethite, especially its competition with catechol, can further our understanding of the fate and transport of natural organic matter analogues in the environment. The adsorption process was investigated using multiple complementary techniques including batch adsorption experiments, flow-cell ATR-FTIR measurement, and DFT calculations. The macroscopic results show that increasing pH and ionic strength had an adverse effect on salicylate adsorption because of electrostatic interactions. Salicylate formed an inner-sphere complex in a mononuclear monodentate configuration with carboxylate bound to the iron atom on goethite surface within pH 5−9. The electrostatic outer-sphere complex could be observed under high salicylate concentrations and low ionic strength. In the competitive adsorption of salicylate and catechol, their individual interfacial complexes coexisted and competed with each other. The surface salicylate could be replaced by catechol during adsorption under neutral and basic pH conditions. Accordingly, the macroscopic adsorption capacity of salicylate was depressed in the binary system.

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“…Figure shows the collected FTIR spectra of the untreated cotton and cotton–MBA–Cl. In the spectrum of cotton–MBA–Cl, the peaks at 2926 and 2854 cm –1 (corresponding to the symmetric and asymmetric stretching vibration of the C–H bonds on −CH 2 –CH 2 −) − became stronger because the −CHCH– double bonds in MBA became −CH 2 CH 2 – after it was grafted onto cotton (as we can see in Figure ). The new peak at 1458 cm –1 corresponds to the in-plane bending vibration of the C–H bonds on −CH 2 –CH 2 –, which also demonstrated that the −CH 2 –CH 2 – became greater, and the new peak at 1281 cm –1 ascribes to the C–N vibrational bond .…”

Section: Results and Discussionmentioning

confidence: 86%

Durable Antibacterial Cotton Fabrics Containing Stable Acyclic N-Halamine Groups

Tian

Zhai

Cheng

et al. 2017

Ind. Eng. Chem. Res.

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Inexpensive and commercially available methylene-bis-acrylamide (MBA) was covalently bonded onto the cotton fabrics by an effective catalytic solid-state reaction in water. The as-prepared MBA grafted cotton fabric (cotton-MBA) was characterized by field emission scanning electron microscopy image and Fourier transform infrared spectroscopy spectra. After a facile chlorination in diluted NaOCl solution, the amide functional groups in cotton-MBA were converted to N-halamine ones and durable antibacterial cotton fabric containing stable noncyclic N-halamine groups (cotton–MBA–Cl) was achieved. Antimicrobial testing showed that the cotton–MBA–Cl could effectively inactivate 5.78 × 107 CFU/mL of S. aureus and 7.58 × 108 CFU/mL of E. coli O157:H7 completely within 1 min of contact time. Washing durability testing indicated that the oxidative chlorine percentage of the cotton–MBA–Cl decreased from 0.43% to 0.06% after 50 washing cycles and was recovered to 0.30% via a simple rechlorination. It means that the N-halamine antimicrobial groups and the covalent bonds between MBA and cotton are very resistant to washing. Storage stability testing showed that the oxidative chlorine percentage of the cotton–MBA–Cl decreased from 0.43% to 0.32% after 30 day’s storage under room temperature, indicating that N-halamine functional groups are stable. Furthermore, it was found that the grafting and chlorination processes did not have any obvious bad effect on the tensile strength of cotton fabrics due to the mild grafting and chlorination conditions.

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A study of competitive adsorption of organic molecules onto mineral oxides using DRIFTS

Cited by 7 publications

References 6 publications

Competition and surface conditioning alter the adsorption of phenolic and amino acids on soil minerals

Competition and surface conditioning alter the adsorption of phenolic and amino acids on soil minerals

Molecular-Scale Study of Salicylate Adsorption and Competition with Catechol at Goethite/Aqueous Solution Interface

Durable Antibacterial Cotton Fabrics Containing Stable Acyclic N-Halamine Groups

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