Pyrolysis and its mechanism of organomontmorillonite (OMMT) influenced by different functional groups

Zhang, Liangliang; Cao, Jinzhen

doi:10.1007/s10973-018-7947-7

Cited by 26 publications

(9 citation statements)

References 43 publications

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“…nites showed to have a different distribution of surface groups in comparison with that of the starting bentonite. Besides that, they contain additional surface groups, such as >C=O, >COOH, >C-OH, >NH 2 , 41,42 and some of them (>COOH groups) are shown to have an inhibitory effect on the electrochemistry of Fe(CN) 6 3-/4-. 43 The intercept of the semicircle with the real axis at higher frequencies represents the internal resistance, R s .…”

Section: Electrochemical Properties Of Carbonized Bentonitementioning

confidence: 99%

Electrochemical properties of carbonized bentonite

Jović-Jovičić

Bajuk‐Bogdanović

Novaković

et al. 2023

JSCS

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Organomodified bentonites were obtained by modification of bentonite clay from local mine Bogovina with four different alkylammonium ions in the amounts that correspond to cation exchange capacity. Carbonized bentonites, obtained by pyrolyzing the organomodified bentonites in the flow of nitrogen, were characterized using the XRD, low-temperature N2 physisorption, and Raman spectroscopy. Structural and textural properties of carbonized bentonites depended on the arrangement of alkylammonium cations in the paternal organomodified bentonite, while the Raman spectroscopy confirmed the presence of amorphous carbon. The obtained carbonized bentonites were used for modification of the carbon paste electrode. The modified electrodes were investigated using cyclic voltammetry and electrochemical impedance spectroscopy. The electrosorption of chloride and sulfate anions on carbonized bentonites was studied by chronocoulometry. The results were interpreted in the terms of surface groups and textural properties of the carbonized bentonites.

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Section: Electrochemical Properties Of Carbonized Bentonitementioning

confidence: 99%

Electrochemical properties of carbonized bentonite

Jović-Jovičić

Bajuk‐Bogdanović

Novaković

et al. 2023

JSCS

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“…By comparing the images of the nonimmersion group samples in Figures 8(a), 8(c), and 8(e), it can be seen that the asphalt binders modified with nanoclays possess a larger amount of bee structures than the control asphalt. is phenomenon may be caused by the dipole-dipole interaction between the nanoclay and macromolecules such as resin and asphaltene [22,57].…”

Section: Limestone1mentioning

confidence: 99%

“…One of the nanoclays that is currently widely used is montmorillonite (MMT) [22]. Due to the small size of MMT and the existence of a large number of exchangeable cations in its interlayers, bitumen molecules can easily intercalate into the interlayers of MMT by reacting with the exchangeable cations [23,24].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoclays on Moisture Susceptibility of SBS‐Modified Asphalt Binder

Wang

Guo

Yang

et al. 2020

Advances in Materials Science and Engineering

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Moisture susceptibility plays an important role in the damage of asphalt pavement. Failure occurs when asphalt is removed from the aggregate particles due to the decreased adhesion between the asphalt and aggregate in comparison with that between water and the aggregate. In recent years, efforts utilizing nanomaterials to improve the diverse properties of asphalt have proven to be effective. In this study, three types of nanoclays were used to modify styrene-butadiene-styrene- (SBS-) modified asphalt. The resistances to water damage of the modified binders were evaluated using the surface free energy (SFE) and atomic force microscopy (AFM). The results revealed that the total SFE decreased and the energy ratio (ER) increased when the asphalt binder was modified with the nanoclays, indicating that the addition of nanoclays can improve the moisture resistance of these aggregate-binder systems. After immersion, a decreased amount of bee structures was observed in both the SBS and nanoclay-modified asphalts due to the interactions between water and bitumen. However, the residual amount of bee structures was higher in the nanoclay-modified asphalts than in the SBS-modified asphalt, indicating that the addition of nanoclay makes the surface morphology of asphalt more resistant to water damage. Finally, freeze-thaw splitting tests were used to verify the results obtained through the SFE and AFM tests.

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“…Therefore, other potentially cheaper adsorbents for the adsorption of organic contaminants are currently being investigated. Composite materials based on clay minerals represent a significant development trend in the field of advanced materials with predefined properties, designed for various applications in sorption processes 9‐12 …”

Section: Introductionmentioning

confidence: 99%

“…Composite materials based on clay minerals represent a significant development trend in the field of advanced materials with predefined properties, designed for various applications in sorption processes. [9][10][11][12] Montmorillonite, a phyllosilicate with a 2:1 structure, has become one of the most widely used clay minerals for the preparation of composites. 9,13,14 The clay mineral matrix of such composites serves as basis for modification/intercalation of organic by inorganic substances.…”

Section: Introductionmentioning

confidence: 99%

Removal of amoxicillin and ampicillin using manganese dioxide/montmorillonite composite

Valovičová

Plevová

Vallová

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND Clay‐based materials represent great potential for the development of efficient and environmentally friendly sorbents. The study focuses on a laboratory‐obtained manganese dioxide/montmorillonite (MnO2/MMT) composite for removal of two types of antibiotics – amoxicillin (AMX) and ampicillin (AMP) – from aqueous solution. RESULTS The composite was successfully prepared using a reduction procedure involving the reaction between potassium permanganate (KMnO4) and hydrochloric acid (HCl) to form MnO2 followed by the addition of MMT. X‐ray analysis, scanning electron microscopy, X‐ray fluorescence and Fourier transform infrared spectroscopy were performed for characterization of physicochemical and structural properties, simultaneous thermogravimetry and differential scanning calorimetry for estimation of thermal stability and high‐performance liquid chromatography for determination of antibiotic equilibrium concentrations in aqueous solution. The precipitated MnO2 component, manifested by long fibers, corresponded to the tunnel structure of cryptomelane. In the case of MnO2/MMT it is evident that MnO2 developed short fibers with the participation of the MMT matrix. The thermal data suggested that the MnO2 phase upon contact with the clay support showed better thermal stability. The final decomposition of Mn2O3 was shifted to higher temperature of 985 °C. Adsorption procedure in a batch regimen showed sufficient sorption ability for both antibiotics with over 90% efficiency. For AMP the value of qmax was about 45 mg g−1 and for AMX it was only 21 mg g−1. CONCLUSIONS The results provided valuable information for the design of a potentially inexpensive clay‐based adsorbent and demonstrated the removal of two types of broad‐spectrum β‐lactam antibiotics from aqueous solution to a sufficient degree. © 2022 Society of Chemical Industry (SCI).

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Pyrolysis and its mechanism of organomontmorillonite (OMMT) influenced by different functional groups

Cited by 26 publications

References 43 publications

Electrochemical properties of carbonized bentonite

Electrochemical properties of carbonized bentonite

Effect of Nanoclays on Moisture Susceptibility of SBS‐Modified Asphalt Binder

Removal of amoxicillin and ampicillin using manganese dioxide/montmorillonite composite

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