Effect of organic modification on the thermal transformations of abentonite during sintering up to 1250°C

Gridi-Bennadji, Fayza; Lecomte‐Nana, Gisèle Laure; Mayet, Richard; Bonnet, J.P.; Rossignol, Sylvie

doi:10.1007/s12034-015-0876-1

Cited by 7 publications

(3 citation statements)

References 35 publications

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“…Also, a feldspar phase is present as shown by a small peak in the figure. This characteristic of the clay is similar to the observations of [22,23]. In the fired clay at 900°C, it shows diminishing peaks of montmorillonite phase, which resulted in the increased intensity of the quartz phase as a result of montmorillonite decomposition [23].…”

Section: X-ray Diffraction Analysis Of Raw and Fired Claysupporting

confidence: 83%

Preparation and Characterization of a Clay-Based Ceramic Membrane for Tannery Wastewater Treatment

Abubakar

Ahmad²

2023

ARASET

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In this work, a porous clay-based ceramic membrane was developed from locally sourced clay from Nigeria. The clay was ground and sieved through 100 μm size. The chemical, mineralogical, thermal and particle size properties of the clay were determined using XRF, XRD, TGA/DTA and PSD respectively. Starch composition from 10-25 wt% was added to the clay and thoroughly mixed with water. The dough was cast on a potter’s wheel. The produced membranes were fired at a temperature of 900 °C. The maturation properties of the fired clay were determined using bulk density and apparent porosity. Multi-point BET was used to determine the pore characteristics of the membranes. The flexural strength of the produced membrane was determined using a three-point bending test. The microstructure of the fired clay was recorded using FESEM. Membranes produced from the clay were used for the treatment of tannery wastewater. The XRF result shows that the clay contains high silica and alumina. Also, the XRD results show the clay contains many peaks of montmorillonite and other peaks of feldspar and quartz. The BET shows that the pore size of the membranes produced was in the mesoporous range. From water quality test, it shows that the locally sourced clay can be used to produce ceramic membranes for filtration and separation applications.

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Section: X-ray Diffraction Analysis Of Raw and Fired Claysupporting

confidence: 83%

Preparation and Characterization of a Clay-Based Ceramic Membrane for Tannery Wastewater Treatment

Abubakar

Ahmad²

2023

ARASET

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“…For all CaB samples, the highest calcination temperature of this study increases the intensity of opal-CT and results in a very sharp, narrow and intense reflection of 0.407-0.409 nm and formation of amorphous silica phases [39]. As stated by Gridi-Bennadji et al [40], the intensity of SiO 2 reflection increases at 1000 °C showing the dominancy of amorphous silica phase.…”

Section: Mineralogical Effects Of Calcinationssupporting

confidence: 66%

Effects of short-term high-temperature calcinations on the physico-chemical and mineralogical properties of Ca-bentonites from Ünye (Ordu, NE Turkey)

Ataytür

Küçükuysal

Güngör³

et al. 2021

J Therm Anal Calorim

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Three Ca-bentonite samples from Ünye (NE Turkey) were calcined up to 1000 °C with 200 °C increments at 25 min. The physico-chemical and mineralogical effects of high-temperature loadings were evaluated by X-ray diffraction (XRD), Fouriertransform infrared spectroscopy (FTIR), scanning electron microscope (SEM), Brunauer-Emmett-Teller (BET) and loss on ignition (LOI) analysis. The results of the experiments show that the dehydration up to 400 °C does not alter the properties of Ca-bentonites significantly; however, the endothermic reactions due to dehydroxylation between 400 and 800 °C cause the deformation in the Ca-smectite crystal structure revealed by the collapse of the basal reflection from 1.4 to 1.0 nm and the gradual disappearance of OH stretching of structural hydroxyl groups and decrease in specific surface area and the closure of micropores. By calcination at 1000 °C, the specific surface area reaches the minima of 1.33-2.05 m 2 g −1 for all the samples, and the structure of Ca-smectite is almost completely decomposed for CaB 2 and CaB 3 , however, partially decomposed for CaB 1 due to incomplete dehydroxylation stage. The crystallinity of opal-CT intensifies, and the formation of amorphous silica phases is promoted for all samples at 1000 °C; however, the formation of mullite is enhanced only for CaB 2 and CaB 3. The sintering effect is revealed as much larger aggregates with more rounded morphologies. It is also determined that the calcination up to 1000 °C does not affect the mesoporous characteristics of Ca-bentonite samples.

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“…However, the EPDM/DVMT/MA nanocomposites showed the highest thermal stability over the temperature range 350–450°C. On other hand, a slight weight loss in the temperature range of 490–600°C can be attributed to the de‐hydroxylation of VMT clay .…”

Section: Resultsmentioning

confidence: 99%

Mechanical and thermal properties of gamma irradiated ethylene propylene diene monomer rubber/vermiculite clay/maleic anhydride composites

El‐Nemr

Khaffaga

Saleh

et al. 2018

Vinyl Additive Technology

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Vermiculite clay (VMT) was first treated with 2 M of hydrochloric acid. The VMT, before and after acid‐treatment, was characterized by X‐ray diffraction (XRD) and transmission electron microscopy. The untreated (VMT) and acid‐treated vermiculite clay DVMT) at different contents (2.5–10 phr) and maleic anhydride (MA) at different contents (3–10 phr) were mixed with ethylene polyethylene diene rubber (EPDM) via direct melt compounding in an internal mixer. The mechanical and thermal properties of gamma irradiated composites were studied. The results indicated that the physical properties of gamma irradiated EPDM/DVMT/MA nanocomposites were greatly improved after loading with either DVMT or MA. The improvement was achieved when the content of DVMT clay was 5 phr, MA 7 phr and irradiation dose at 75 kGy. J. VINYL ADDIT. TECHNOL., 25:E3–E11, 2019. © 2018 Society of Plastics Engineers

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Effect of organic modification on the thermal transformations of abentonite during sintering up to 1250°C

Cited by 7 publications

References 35 publications

Preparation and Characterization of a Clay-Based Ceramic Membrane for Tannery Wastewater Treatment

Preparation and Characterization of a Clay-Based Ceramic Membrane for Tannery Wastewater Treatment

Effects of short-term high-temperature calcinations on the physico-chemical and mineralogical properties of Ca-bentonites from Ünye (Ordu, NE Turkey)

Mechanical and thermal properties of gamma irradiated ethylene propylene diene monomer rubber/vermiculite clay/maleic anhydride composites

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