Structural, textural and protein adsorption properties of kaolinite and surface modified kaolinite adsorbents

Duarte-Silva, Renata; Villa‐García, María A.; Rendueles, Manuel; Dı́az, Mario

doi:10.1016/j.clay.2013.12.027

Cited by 57 publications

(31 citation statements)

References 32 publications

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“…HR-MAS NMR analysis of the initial kaolinite organo-clay complex showed resonances for CH 2 and CH 3 groups, further indicating the sorption of aliphatic components or proteins (Figure 4). These results agree with previous studies that have observed sorption of aliphatic-and protein-derived DOM components to uncoated kaolinite surfaces [7,14,15,49,50]. The initial sorption of proteins to kaolinite is also consistent with the proposed zonal model of organo-mineral interactions [3].…”

Section: Sorption Of Specific Dom Components To Kaolinitesupporting

confidence: 92%

Nuclear Magnetic Resonance Analysis of Changes in Dissolved Organic Matter Composition with Successive Layering on Clay Mineral Surfaces

et al. 2018

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Dissolved organic matter (DOM) chemistry and the potential for organic matter (OM) to self-associate with other OM components are important aspects of understanding the mechanisms of DOM sorption to clay surfaces. To investigate this further, we sorbed DOM isolated from peat humic acid onto either kaolinite, montmorillonite and gibbsite via ten sequential batch equilibration sorption experiments. Dissolved organic carbon (DOC) sorption to all minerals increased consistently, suggesting that sorption occurred via mineral-OM interactions at the beginning of the experiment. After six successive DOM loadings, the concentration of DOC sorbed by kaolinite and gibbsite began to plateau, likely due to the saturation of mineral surface sorption sites. Solution-state nuclear magnetic resonance (NMR) analysis of unbound DOM showed that kaolinite and montmorillonite sorbed aliphatic, protein and lignin components initially and primarily aliphatic and aromatic constituents in later sorption experiments, whereas gibbsite sorbed mostly aliphatic compounds during all DOM loadings. Analysis of the organo-clay complexes using 1 H high resolution-magic angle spinning (HR-MAS) NMR confirmed the preferential sorption of aromatic and aliphatic components to all three minerals. Overall, these results suggest that OM-OM interactions may be important mechanisms of DOM sorption to clay mineral surfaces.Soil Syst. 2018, 2, 8 2 of 17 such as van der Waals forces and hydrogen bonding, while aromatic components were sorbed to a lesser extent and primarily by montmorillonite [14][15][16]. Although previous studies have provided molecular-level insight into sorption processes, most have only examined one DOM loading onto the mineral surface [8][9][10][12][13][14][15][16]. In soil, a mineral particle may be coated with several layers of OM to form organo-clay complexes [3,16,17], and the mineral sorption capacity for OM may decrease with successive OM loading as reactive surface functional groups become saturated with OM [18]. Currently, it is unclear whether mineral properties such as SSA and CEC continue to control DOM sorption with increasing OM layering [19][20][21][22], which may limit the amount of OM that can be sequestered by organo-mineral associations [23].Several studies have demonstrated that OM-OM interactions may also stabilize and protect OM from degradation in soil [24][25][26]. For example, protein encapsulation in humic acid prevented hydrolysis of a proteins by strong acid [26], while coating lignin with dodecanoic acid protected the lignin from chemical degradation by NaClO 2 [24]. Similarly, Thevenot et al. [25] observed that lignin and aliphatic soil OM components such as plant and microbial lipids were associated in ligno-aliphatic complexes, which may slow lignin degradation in soil. In another study, the removal of O-alkyl soil OM components by acid hydrolysis increased the sorption capacity of several soils for three organic contaminants [27]. This suggested that high affinity aliphatic and aromatic sorption domains in ...

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Section: Sorption Of Specific Dom Components To Kaolinitesupporting

confidence: 92%

Nuclear Magnetic Resonance Analysis of Changes in Dissolved Organic Matter Composition with Successive Layering on Clay Mineral Surfaces

et al. 2018

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“…3a), and the bands at 915 cm −1 was due to the hydroxyl-deformation modes of the inner hydroxyls ( Fig. S4) (Duarte-Silva et al, 2014). The bands at 791 cm − 1 , 755 cm − 1 and 697 cm −1 were attributed to Al-OH translational vibration (Fig.…”

Section: Resultsmentioning

confidence: 97%

Kaolinite stabilized paraffin composite phase change materials for thermal energy storage

Ouyang

et al. 2015

Applied Clay Science

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“…However, the adsorption capacity of raw kaolin is still insufficient for the removal of water pollutants below the recommended level. Hence, modification of kaolinite through intercalation of inorganic and organic compounds has brought additional adsorption efficiency (Duarte-Silva et al 2014;Zenasni et al 2014;Diab et al 2015;Shaban et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Preparation of cationic surfactant-modified kaolin for enhanced adsorption of hexavalent chromium from aqueous solution

Belachew

Hinsene

2019

Appl Water Sci

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In the current work, we have reported a cationic surfactant-modified Ethiopian kaolin for improved adsorption of Cr(VI) from aqueous solution. The raw kaolin was modified by treating with CTAB to enhance the adsorption properties. The crystal structure and vibrational analysis of CTAB-kaolin were investigated by Fourier transform infrared spectroscopy (FTIR) and powder X-ray diffraction (p-XRD) techniques. The successful modification of kaolin by CTAB through intercalation and coating was investigated by XRD and FTIR. p-XRD confirms the raw kaolin obtained from Belesa, Tigo kebele is kaolinite mineral. The study has also focused on the application of kaolin-CTAB for adsorption of hexavalent chromium. The percent removal of Cr(VI) was investigated at different parameters such as pH, contact time, concentration of Cr(VI) and adsorbent dosage. CTAB-kaolin shows 99% removal of Cr(VI) at the adsorption equilibrium (time = 180 min, 100 mg CTAB-kaolin, 10 ppm/100 ml). The Langmuir and Freundlich isotherm models were used to investigate the adsorption process of chromium onto kaolin-CTAB composites. The equilibrium data obeyed Langmuir model than Freundlich, which shows that the adsorption process proceeds through monolayer adsorption and maximum adsorption capacity was found to be Q o = 22.72 mg/g. The pseudo-second-order kinetics model is found to be well fitted than Pseudo-first-order kinetics, which implies that the adsorption mechanism more favors electrostatic interaction between chromium and kaolin-CTAB composites. In conclusion, CTAB-kaolin was found to be a promising adsorbent for the efficient removal of Cr(VI) from the aqueous solution.

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Structural, textural and protein adsorption properties of kaolinite and surface modified kaolinite adsorbents

Cited by 57 publications

References 32 publications

Nuclear Magnetic Resonance Analysis of Changes in Dissolved Organic Matter Composition with Successive Layering on Clay Mineral Surfaces

Nuclear Magnetic Resonance Analysis of Changes in Dissolved Organic Matter Composition with Successive Layering on Clay Mineral Surfaces

Kaolinite stabilized paraffin composite phase change materials for thermal energy storage

Preparation of cationic surfactant-modified kaolin for enhanced adsorption of hexavalent chromium from aqueous solution

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