Production of silica gel from Tunisian sands and its adsorptive properties

Lazaar, Khalil; Hajjaji, W.; Pullar, Robert C.; Labrincha, J.A.; Rocha, Fernando; Jamoussi, Fakher

doi:10.1016/j.jafrearsci.2017.03.017

Cited by 23 publications

(11 citation statements)

References 24 publications

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“…This is a hysteresis loop shape typical for aggregates, and it was observed that the silica gel's BET SSA decreased when synthesis was carried out in a neutral or alkaline medium, this effect increasing with pH. This is in good agreement with previously reported results [22,25].…”

Section: Characterisation Of the Silica Gelsupporting

confidence: 92%

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Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Lazaar

Pullar

Hajjaji

et al. 2021

Silicon

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The study describes the chemical-mineralogical characterization of Barremian sand deposits. These Sidi Aich sands were collected in central Tunisia. The collected raw silica sand from the Jebel Meloussi (central Tunisia) was characterised by different techniques, such as X-ray diffraction (XRD), X-ray uorescence (XRF) and scanning electron microscopy (SEM). X-ray diffraction showed a predominance of quartz and potassic feldspars and lower amounts of kaolinite and calcite. The obtained silica gels had pore diameters over 20 Å and speci c surface areas up to 183 m 2 /g, close to those reported for commercial silica gel materials. The N 2 adsorption isotherms have shown that new materials synthesised from Tunisian silica sands are mesoporous materials with high chemi-physical adsorption capabilities.

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Section: Characterisation Of the Silica Gelsupporting

confidence: 92%

“…The silica gel synthesised at pH 3 (GM3) shows an isotherm with a type H2 hysteresis loop, which indicates the presence of spherical pores [22,25]. This sample has a broad H2 type loop, in which the desorption branch is at a much steeper angle than the adsorption branch.…”

Section: Characterisation Of the Silica Gelmentioning

confidence: 99%

Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Lazaar

Pullar

Hajjaji

et al. 2021

Silicon

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“…The treatment of industrial waste containing this type of dye is of great interest (Sakr et al 2015;Lazaar et al 2017), but the removal of low levels of such compounds is difficult. Several methods and techniques have been developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of natural clay and titania P25 composites in the decolouring of methylene blue (MB) from aqueous solutions: dual adsorption and photocatalytic processes

et al. 2021

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In this paper, we use Tunisian clay materials as alternative low-cost adsorbents, as well as substrates to immobilise TiO 2 for the decolouration of methylene blue (MB) dye solutions. The collected raw clay from the mine of Tamra was characterised by various techniques, such as X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray fluorescence (XRF). XRD patterns of the raw clay showed halloysite as the main phase (61%), with a lower content of kaolinite (39%). For MB adsorption, the experimental data were fitted by Langmuir and Freundlich adsorption equations. It was found that the studied clays alone were not very efficient at adsorbing MB dye molecules. The decolouration of MB was improved by adding a photocatalytic function to the clay, by adding various amounts of TiO 2 nanopowder (20-80 wt%) to the clay, imbuing it with photocatalytic capabilities. These combined effects of the phenomena of adsorption and photocatalysis for MB removal by the TiO 2 -doped clay resulted in a very satisfactory performance, even with the relatively low quantity of 20 wt% added TiO 2 photocatalyst. This gave 48.6% removal after only 30-min adsorption in the dark, increasing to 84.1% removal after a further 3 h under UV light, through combined chemo-physical adsorption and photocatalytic decolouration phenomena.

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“…The compression characteristics show a rising nonlinear relationship between loading force and deformation (regardless of external expansion coefficient of abrasive) in the compression process. This owns to the interface compatibility between the hard particles and matrix [11][12][13][14]. Gas spillover is not ideal in composites stirring process, so that there are obvious some gas overflows and cavitation in composites as shown in Fig.…”

Section: Compression Characteristics Of Silicone Gel Compositesmentioning

confidence: 99%

“…Silicone gel with the macromolecular chain has a unique structure performance, belongs to an amorphous substance with a highly active adsorption features, and is different from that of metals. The Silicone gel chemical formula is [Si 2 O•mSiO 2 ] with a strong mechanical strength based on the skeleton of (-Si-O-) [10][11][12][13][14][15][16] . Different sizes of porous structure will be formed in composite preparation process.…”

Section: Compression Characteristics Of Silicone Gel Compositesmentioning

confidence: 99%

Preparation, Microstructure and Compressive Properties of Silicone GEL/SiC Composites for Elastic Abrasive

Ding

et al. 2018

Advanced Composites Letters

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An elastic abrasive tool based on micropore silica gel was designed and reinforced with silicon carbide (SiC) particle. The abrasive internal structure presents porous chain network structure, and the enhanced particles uniformly distributed in the matrix. The compression performance of modified composites is nonlinear increasing. The experimental results show that the accumulating energy of the self microporous structure is easy to overcome the internal friction in a certain deformation quantity of the materials. When the deformation quantity is large enough, the microporous structure and the chain segment structure of the matrix silica gel affect weakened, so that the properties of the composite decreased. And there is a synergistic relationship between the particles size and the matrix silica gel. That is, when the particle size is near the silicon chain length, the effect of particle enhancement is obvious. When the particle size is small, the effect of particles was reduced because the particles are inlaid between the slots in the silicon chain. On the other hand, when the particle size is larger, the particles are not work in the composites.

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Production of silica gel from Tunisian sands and its adsorptive properties

Cited by 23 publications

References 24 publications

Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Preparation of Silica Gel Obtained from Early Cretaceous Sidi Aich Sands (Central Tunisia) and its Potential to Remove Pollutant Dye Anionic from Wastwaters

Efficiency of natural clay and titania P25 composites in the decolouring of methylene blue (MB) from aqueous solutions: dual adsorption and photocatalytic processes

Preparation, Microstructure and Compressive Properties of Silicone GEL/SiC Composites for Elastic Abrasive

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