Preparation of copper oxide in smectites

Khaorapapong, Nithima; Khumchoo, Nuttaporn; Ogawa, Makoto

doi:10.1016/j.clay.2014.11.038

Cited by 18 publications

(7 citation statements)

References 39 publications

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“…This is seen through a decrease in the intensities of the water bands in the infrared region at around 1630 cm -1 and 3400 cm -1 [12,13] and new bands related to the surfactants. Transmission and scanning electron microscopy analyses (TEM and SEM, respectively) have been applied to study the macrostructural features of modified clays [14][15][16]. The TEM analyses showed the packing density of modified clays within the interlayer space, and SEM micrographs showed the difference in surface morphology of untreated and modified clays [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Transmission and scanning electron microscopy analyses (TEM and SEM, respectively) have been applied to study the macrostructural features of modified clays [14][15][16]. The TEM analyses showed the packing density of modified clays within the interlayer space, and SEM micrographs showed the difference in surface morphology of untreated and modified clays [14][15][16]. Thermogravimetry (TG) and differential scanning calorimetry (DSC) have been applied to get information on the thermal behavior of modified clays [17,18].…”

Section: Introductionmentioning

confidence: 99%

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Solid-state synthesis and physico-chemical characterization of modified smectites using natural clays from Burkina Faso

Garikoé¹,

Sorgho²,

Guel³

et al. 2021

Bull. Chem. Soc. Eth.

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Solid-state intercalation was applied to prepare organo-smectites using cationic surfactants and natural clays containing smectite at various surfactant/smectite ratios. The surfactants enter the interlayers of smectites causing a swelling of the clays. The used clays were collected in Siétougou and Diabari villages located in the eastern part of Burkina Faso. The solid-state intercalation was successful for all four surfactants applied, n-dodecyltrimethylammonium bromide, (n-C12H25(CH3)3NBr), n-tetradecyltrimethylammonium bromide, (n-C14H29(CH3)3NBr), n-hexadecyltrimethylammonium bromide (n-C16H33(CH3)3NBr) and di-n-dodecyldimethylammonium bromide ((n-C12H25)2(CH3)2NBr) at different levels of the cation exchange capacity (CEC). The synthesized organo-smectites were characterized regarding relative density, structural and textural properties. XRPD data showed a systematic increase of the basal spacing of the unit cell of the smectite up to >38 Å at 2.0-CEC loading of the surfactant. This increase indicates that the surfactants penetrated into the smectite interlayers with the surfactants being arranged parallel to the layers at low concentrations and almost perpendicular at high ones. FTIR spectra of the organo-smectites showed a decrease in the intensities of the water bands at around 1630 cm-1 and 3400 cm-1, and new specific bands close to 2920 cm-1 and 2850 cm-1 were assigned to the asymmetric and symmetric stretching of CH2 groups of the surfactants, respectively. KEY WORDS: Smectite, Organo-smectite, Surfactant, Intercalation Bull. Chem. Soc. Ethiop. 2021, 35(1), 43-59. DOI: https://dx.doi.org/10.4314/bcse.v35i1.4

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Solid-state synthesis and physico-chemical characterization of modified smectites using natural clays from Burkina Faso

Garikoé¹,

Sorgho²,

Guel³

et al. 2021

Bull. Chem. Soc. Eth.

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“…The slightly lower values for PVP seem to indicate improved agglomeration prevention (i.e., superior capping agent properties). No CuNP-related transitions were observed in the 500–600 nm region …”

Section: Resultsmentioning

confidence: 96%

“…No CuNP-related transitions were observed in the 500− 600 nm region. 94 Nanoparticle-Coated Fabric Substrates. Since hydrophobicity and its variation largely depend on surface roughness, imaging was done on both preformed samples and substrate coatings to determine morphology (Figure 2).…”

Section: ■ Resultsmentioning

confidence: 99%

Sonochemical Routes to Superhydrophobic Soft Matter Coatings: Comparing Silica and Copper Oxide Coatings on Polyester Fabric

Ming

Chan

Mutalik

et al. 2022

Ind. Eng. Chem. Res.

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Reliable and long-lasting water repellency, ideally based on fluorine-free additives, is a desired utility in functional textiles, e.g., for outdoor active wear, workwear, and even protective medical garments. To date, such coating treatments have usually been accomplished by pad-dry-cure, electrolysis, or similar methods that tend to be time-consuming and often yield unsatisfactory coating results. In this study, hydrophobic-coated polyester substrates were prepared using a sonochemical coating process. Comparisons were made between the performances and associated morphological variations of amorphous nano-dimensional silica versus nanocrystalline cupric oxide hydrophobic coatings, which were separately made and successfully loaded, via a random distribution, onto mesoporous polyester-woven fabric substrates. Shorter sonication times seem to allow for retention of preformed morphologies into the subsequent coating patterns. The nanocomposite coatings and their components were characterized using X-ray diffraction (XRD), attenuated total reflectance-infrared Fourier transform infrared (ATR-FTIR), SEM, scanning electron microscope (SEM), UV–vis, dynamic light scattering (DLS), and Raman spectroscopy measurements. Almost all coatings displayed highly hydrophobic static water contact angle valuesfor CuO, these values further increased with time, a rarely reported aging effect thought due to the presence of mixed oxides that likely formed in the coating due to the spallative ultrasonic approach. In addition, the efficacy of these hydrophobic semipermeable fabrics to hexane–water mixture separations, with varying concentrations of Na2SO4, was found to be >99% for optimized membranes, with an associated permeation flux of ∼5.9 ± 2 L m–2 h–1, a water content of ∼0%, and a salt rejection capability of ∼94%. Thus, non-fluorine-containing sonochemical coating formulations and processes are ideal in the coating of soft matter, polymeric textiles.

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“…Copper, which presents the electronic configuration: [Ar] 3d 10 4s 1 , is strongly adsorbed by inner‐sphere complexes onto the surface functional groups of organic compounds (Sebastia et al, 2008) and/or inorganic colloids, as can also be fixed in 2:1 clay mineral interlayers (Choy et al, 2002; Khaorapapong et al, 2015). For Zn, because of its electronic configuration of [Ar] 3d 10 4s 2 , its adsorption energy is lower than that of Cu for both surface functional groups.…”

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confidence: 99%

Accumulation and Precipitation of Cu and Zn in a Centenarian Vineyard

Bortoluzzi

Korchagin

Moterle

et al. 2019

Soil Science Soc of Amer J

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The study highlights soil geochemical‐mineralogical alteration due to Cu‐based fungicide application. Copper enrichment reached 26 times greater in vine rhizosphere than in the control site. Copper precipitation at high soil pH favors mineral formation in the vine rhizosphere. Vineyard areas have received remarkable amounts of Cu‐based fungicides and organic waste, causing metals to accumulate in the soil profile. The objective of this study was to determine the different chemical forms of Cu and Zn in a centenarian vineyard soil and discuss the formation of Cu‐ and Zn‐bearing minerals in the clay fraction. For this, a Brazilian Inceptisol planted with vines (123‐yr‐old vineyard) was sampled in (i) the vine rhizosphere (RV), (ii) the middle of the plant row (MPR), and (iii) under a natural forest site (F) (control treatment). The amounts of total, exchangeable and residual Cu forms in the RV reached 4500, 1400, and 600 mg kg‐1, respectively. The chemical enrichments of Cu and Zn in RV were 26 and 2.8 times greater than those in the F site, respectively. Peaks were observed on the X‐ray diffraction (XRD) patterns in the clay fraction from the RV site that were compatible with Cu‐bearing minerals. The mineralogical results are potentially and broadly significant to highlight the mechanisms of co‐precipitation of toxic ions in soils where fungicides were applied. A centenarian vineyard that received high amounts of Cu‐based fungicide accumulated Cu in the rhizosphere zone, had favorable conditions (i.e., high metal and pH levels) for the occurrence of Cu‐bearing minerals. Furthermore, long‐term traditional agriculture practices should be revisited to avoid environmental contamination.

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Preparation of copper oxide in smectites

Cited by 18 publications

References 39 publications

Solid-state synthesis and physico-chemical characterization of modified smectites using natural clays from Burkina Faso

Solid-state synthesis and physico-chemical characterization of modified smectites using natural clays from Burkina Faso

Sonochemical Routes to Superhydrophobic Soft Matter Coatings: Comparing Silica and Copper Oxide Coatings on Polyester Fabric

Accumulation and Precipitation of Cu and Zn in a Centenarian Vineyard

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