The determination of some crystallographic parameters of quartz, in the sand dunes of Ouargla, Algeria

Beddiaf, Samiha; Chihi, Smail; Leghrieb, Youcef

doi:10.1016/j.jafrearsci.2015.03.014

Cited by 32 publications

(9 citation statements)

References 11 publications

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“…which can act as binding sites for contaminants. Furthermore, strong absorption bands at 792 and 707 cm −1 consistent with the symmetric Si-O stretching and bending vibrations of the SiO 2 functional group were conspicuously present in the spectra, which confirms the presence of quartz in the sand 39 . Whereas, the sharp band observed at 874 cm −1 can be assigned to the Ca-O stretching of the calcium carbonate species present in the sand 40 .…”

Section: Resultssupporting

confidence: 54%

Sustainable synthesis of graphene-based adsorbent using date syrup

Khan

Edathil

Banat

2019

Sci Rep

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Here we demonstrate, a facile in-situ strategy for the synthesis of environmentally benign and scalable graphene sand hybrid using date syrup as a sustainable carbon source through pyrolysis at 750 °C. Raman and SEM images revealed that the as-prepared date syrup-based graphene sand hybrid (D-GSH) had imperfections with macroporous 2-D graphene sheet-like structures stacked on the inorganic sand support. The applicability of the D-GSH for decontaminating the water from cationic (Methyl Violet, MV) and anionic (Congo Red, CR) dye and heavy metals (Pb2+ and Cd2+) was tested. Batch experiments demonstrated that D-GSH showcased exceptional capability for both dye and heavy metals removal with fast adsorption following pseudo-second-order kinetics. The adsorption capacities for MV, Pb2+, and Cd2+ were respectively 2564, 781 and 793 mg/g at 25 °C, the highest capacity graphene-based adsorbent reported in the literature to date. In addition, D-GSH also exhibited high adsorption capacity for anionic dye, CR (333 mg g−1) and good recyclability (3 cycles) for all the contaminants. The thermodynamic studies further confirmed that the adsorption of all contaminants was thermodynamically feasible, spontaneous and endothermic with ∆H° of 48.38, 89.10, 16.89 and 14.73 kJ/mol for MV, CR, Pb2+ and Cd2+, respectively. Thus, utilization of a simple one-step strategy to produce graphenic sand hybrid using date syrup helped in developing a cost-effective and environmentally friendly dye and heavy metal scavenger that can be used as a one-step solution for water decontamination.

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Section: Resultssupporting

confidence: 54%

Sustainable synthesis of graphene-based adsorbent using date syrup

Khan

Edathil

Banat

2019

Sci Rep

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“…Further, powder XRD was pursued on various samples, which also confirmed the presence Fe, Cu, and sand in the prepared nanocomposites. XRD patterns of only sand (Figure a) showed diffractions at 2θ values of 21.0(100-Q), 25.7(002-K), 27(011-Q), 28.4(002-A), 35.5(201-K/131-I), 36.8(110-Q/200-K), 39.7(131-K, 111-Q), 42.8(200-Q), 46.1(201-Q), 50.5(112-Q), 55.2(204-K/240-K/022-Q), 59.96(121-Q), and 68.1(122-Q)°, indicating the presence of quartz (Q), kaolinite (K), Illite (I), and albite (A). − The sand–Fe nanocomposites (Figure b) showed major characteristic peaks of iron oxide NPs (Fe 2 O 3 ) at 2θ values of 33.2(104), 35.7(110), 49.49(024), 54.1(116), 62.5(214), 72.6(119), and 75.1 (220)°. Further, peaks at 30.2(220) and 56.9(511) indicated the formation of Fe 3 O 4 . ,− Peaks at 27.1(011), 36.5(110), 42.9(200), and 68.2(122)° suggested the presence of quartz in the sample as well. − Figure c corresponds to sand–Fe–Cu nanocomposites where peaks at 2θ values of 24.4(012), 33.12(104), 35.6(110), 39.9(006), 40.9(113), 63.9(300), and 69.2(208)°, confirmed the presence of iron oxide NPs (Fe 2 O 3 ).…”

Section: Resultsmentioning

confidence: 99%

Bimetallic Fe–Cu Nanocomposites on Sand Particles for the Inactivation of Clinical Isolates and Point-of-Use Water Filtration

Das

Goswami

Ghosh

et al. 2018

ACS Appl. Bio Mater.

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Bimetallic Fe–Cu nanocomposites with an average size of 26.4 ± 4.7 nm were prepared on the surface of fine sand particles by modified coprecipitation and the chemical reduction method and were applied as an in vitro broad spectrum antimicrobial agent and recyclable hand-held water filter to sieve bacteria and metals. The size of the nanocomposites could be further reduced to 11.8 ± 1.6 nm when prepared after ball milling the sand particles, keeping the antimicrobial property intact. The results showed that the chemical nature and morphology of the nanocomposites had a great effect on both Gram-positive and Gram-negative bacteria with a minimum inhibitory concentration of 10.6 μg/mL and 13.8 μg/mL of copper, whereas the minimum bactericidal concentration was found to be 15.9 μg/mL and 21.2 μg/mL. The nanocomposites exhibited antimicrobial activity against multidrug-resistant bacteria as well as fungus isolated from different human biological samples like blood, urine, pus, and wound swabs. The nanocomposites were also capable of filtering a wide range bacteria like Acinetobacter baumannii, Escherichia coli, Salmonella typhi, Bacteroides fragilis, Salmonella paratyphi, Shigella dysenteriae, and Enterococcus faecalis, which are predominantly responsible for waterborne diseases. Further, the nanocomposites were used for the removal of hazardous metals like nickel, zinc, and lead. Leaching of copper and iron from the nanocomposites was within the permissible limit as per Bureau of Indian Standards (BIS) for Drinking Water (IS-10500-2012, second revision) as well as the International Standards for Drinking Water.

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“…It would, therefore, seem that the formula should be SiO 4 , but each oxygen atom is bonded to another silicon atom as well [2].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Algerian Sand for Photovoltaic Application

et al. 2016

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Extracting quartz from sand, as well as extracting silicon from quartz requires knowledge of the physical and chemical properties of quartz found in the sand. In this work the chemical composition, the crystallographic phase, crystal system, space group, unit cell parameters, the absorption bands, the granulometric analysis and the microscopic observations of quartz in the sand from Mostaganem (Algeria) region have been carried out using X-ray fluorescence, X-ray diffraction, infrared spectroscopy, sifting, optical and scanning electron microscopy in order to determine the rate and the nature the crystallinity of its various components and to discover a layer rich in silica, containing a sufficient reserve to feed a unit manufacturing pure silicon starting from silica. The study is driven by current economic importance of the silicon application in the field of photovoltaic solar cells. The X-ray fluorescence indicates that Mostaganem sand has got a very good purity (99.5% silica). The crystallographic parameters of Mostaganem sand have been determined through analysis of X-ray diffraction. The following parameters were found, hexagonal crystal system, space group P3221, unit cell parameters: a = b = 4.9030 Å, c = 5.3999 Å. The infrared absorption spectrum of studied sand exhibits absorption bands characterizing the SiO2 compound, due to Si-O-Si and Si-O aggregates and others. The granulometric analysis determines the percentage of the various fraction of the grain. The microscopy observation gives the shape of the grain. The results show finally that Mostaganem sand has got good proprieties for the photovoltaic application.

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The determination of some crystallographic parameters of quartz, in the sand dunes of Ouargla, Algeria

Cited by 32 publications

References 11 publications

Sustainable synthesis of graphene-based adsorbent using date syrup

Sustainable synthesis of graphene-based adsorbent using date syrup

Bimetallic Fe–Cu Nanocomposites on Sand Particles for the Inactivation of Clinical Isolates and Point-of-Use Water Filtration

Valorization of Algerian Sand for Photovoltaic Application

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