On the investigation of acid and surfactant modification of natural clay for photocatalytic water remediation

Soni, Vineet Kumar; Roy, Toran; Dhara, Suman; Choudhary, Ganpat; Sharma, Pragati; Sharma, Rakesh K.

doi:10.1007/s10853-018-2308-2

Cited by 21 publications

(5 citation statements)

References 66 publications

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“…If numerous OHs were cleaved or extra formed, H 2 O amount might vary. Considering literatures, 4–6,35,40 to muscovite, thermal‐induced dehydroxylation would not happen at a temperature lower than 600°C and originally existed H 2 O could volatilize completely under heating up to this degree. In this case, a 50–600°C TGA experiment could measure H 2 O amount efficiently.…”

Section: Resultsmentioning

confidence: 98%

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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Electronic components made by inorganics (e.g., mica) play key roles in function exertion of instruments working in outer‐layer space, enduring long‐term β ray irradiation. Its damage is vital while explored rarely. Herein, pure muscovite crystals were chosen and irradiated by an electron beam (EB) in air with dose up to 1000 kGy. Then, micro‐geometry morphology variation in Z‐axis and microstructural transformation mechanism were explored by XRD, FT‐ATR IR, TGA, XPS and CA analysis. Main results reveal that muscovite lattice is unstable to EB irradiation. With dose increases to 1000 kGy interlayer space d of (002) lattice varied 2% near 0.2 Å. At low dose irradiation lattice expansion is readily to occur while at higher dose it is lattice shrinkage, showing a transformation from expansion to shrinkage. Concurrently, chemical structure varied, H2O amount increased, metal element valance and surface wettability were reduced. Where, dehydroxylation occurred exceeding H2O radiaolysis and evaporation, and framework cleavage be severe. Binding energies of metals of 1000 kGy‐irradiated species decreased by 0.2 eV, CA of 100 kGy‐irradiated species increased by 10°. Intrinsic mechanisms involve framework destruction, H‐atom migration, hydrogen bond formation/destruction and H2O radiolysis. At low dose irradiation, H‐atom migration and hydrogen bond formation/destruction are predominant, inducing lattice expansion; at higher dose, framework cleavage is intensive and crucial, inducing shrinkage. During which, partial H2O occurred radiolysis, reducing valence. Generally, H‐atom migration and interface cleavage played key roles in microgeometry morphology variation of muscovite crystal under EB irradiation at 0–1000 kGy. To enhance muscovite geometry morphology‐stability under a long‐term β‐ray irradiation condition OH and hydrogen bond contents should be reduced and interface region should be strengthened (e.g., lessening vacancies or compacting stacking). This conclusion promotes design of radiation‐resistant silicate material, guiding manufacture of electronic component used in aerospace industry, significant.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 98%

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

Wang,

Sun,

Xia

et al. 2023

J Am Ceram Soc.

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“…The black and red scoria powders were exposed to heat in static air with a rate of 5 °C/min from RT up to 1300 °C to study their thermal properties. Thermal treatment is a significant factor that results in many structural transformations like decomposition, oxidation, surface reconstruction, and formation of distinct phases [ [28] , [29] , [30] , [31] ]. The DSC analysis of the two scoriae is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

The impact of thermal treatment on the mechanical properties and thermal insulation of building materials enhanced with two types of volcanic scoria additives

Alraddadi

2023

Heliyon

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“…It is essential to certify this process. In early reports [58,[77][78][79][80][81][82][83][84][85], for muscovite, thermal-induced dehydroxylation would not happen at a temperature lower than 5008C. Under this assumption, mass variation at a temperature lower than 5008C could be ascribed to volatilization of H 2 O that originally existed.…”

Section: H 2 O Amount Analysismentioning

confidence: 99%

Intensive study on structure transformation of muscovite single crystal under high-doseγ-ray irradiation and mechanism speculation

et al. 2019

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Intensive study on structure transformation of muscovite single crystal under high-dose γ -ray irradiation is essential for its use in irradiation detection and also beneficial for mechanism cognition on defect formation within a matrix of clay used in the disposal of high-level radioactive waste (HLRW). In this work, muscovite single crystal was irradiated with Co-60 γ ray in air at a dose rate of 54 Gy min −1 with doses of 0–1000 kGy. Then, structure transformation and mechanism were explored by Raman spectrum, Fourier-transform infrared spectrum, X-ray diffraction, thermogravimetric analysis, CA, scanning electron microscope and atomic force microscopy. The main results show that variations in the chemical/crystalline structure are dose-dependent. Low-dose irradiation sufficiently destroyed the structure, removing Si–OH, thus declining hydrophilicity. With dose increase up to 100 kGy, CA increased from 20° to 40°. Except for hydrophilicity variation, shrink occurred in the (004) lattice plane which later recovered; the variation range at 500 kGy irradiation was 0.5% close to 0.02 Å. The main mechanisms involved were framework break and H 2 O radiolysis. Framework break results in Si–OH removal and H 2 O radiolysis results in extra OH introduction. The extra introduced OH probably results in Si–OH bond regeneration, lattice plane shrink and recovered surface hydrophilicity. The importance of framework break and H 2 O radiolysis on structure transformation is dose-dependence. At low doses, framework break seems more important while at high doses H 2 O radiolysis is important. Generally, variations in the chemical structure and surface property are nonlinear and less at high doses. This indicates using the chemical structure or surface property variation to describe irradiation is correct at low doses but not at high doses. This finding is meaningful for realizing whether muscovite is suitable for detecting high-dose irradiation or not, and mechanism exploration is efficient for identifying the procedure for defect formation within the matrix of clay used in disposal HLRW in practice.

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On the investigation of acid and surfactant modification of natural clay for photocatalytic water remediation

Cited by 21 publications

References 66 publications

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

An exploration of lattice transformation mechanism of muscovite single crystal under EB irradiation at 0–1000 kGy

The impact of thermal treatment on the mechanical properties and thermal insulation of building materials enhanced with two types of volcanic scoria additives

Intensive study on structure transformation of muscovite single crystal under high-doseγ-ray irradiation and mechanism speculation

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