Enhancing Egyptian kaolinite via calcination and dealumination for application in paper coating

El-Sherbiny, Samya; Morsy, Fatma A.; Hassan, Mostafa Afifi; Mohamed, Heba F.

doi:10.1007/s11998-015-9672-5

Cited by 12 publications

(9 citation statements)

References 22 publications

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“…This might be due to the nanosize regime of the obtained particles as will be shown later. It is widely known that the widening and low intensity of all sample peaks indicate that the as-synthesized particles have small crystallite sizes (El-Sherbiny et al 2015 ; Morsy et al 2014 ). All diffraction peaks are consistent with the (101), (004), (200), (211) and (213) crystal planes of TiO 2 anatase phase (JCPDS card no.…”

Section: Resultsmentioning

confidence: 99%

“…Pigment is the main constituent in the coating mixture, and it is responsible for controlling the coating components’ qualities (Gullichsen and Paulapuro 2000 ). Pigments arise from several minerals, like kaolin clay, calcium carbonate, silica and titanium dioxide pigment; these pigments can be used alone or mixed (Ahmed et al 2012 ; El-Sherbiny et al 2015 ; Morsy et al 2014 ).…”

Section: Introductionmentioning

confidence: 99%

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Enhancing the anti-ageing, antimicrobial activity and mechanical properties of surface-coated paper by Ag@TiO2-modified nanopigments

Samir

Geioushy

El-Sherbiny

et al. 2022

Environ Sci Pollut Res

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In this work, the effect of using Ag-doped TiO2 nanopigments on optical, mechanical and antimicrobial properties of coated paper was explored. Furthermore, the long-term antimicrobial activity of the coated paper was examined for up to 25 years. Titanium dioxide (TiO2) nanoparticles have been synthesized and doped with different percentages of Ag nanoparticles (Ag NPs) using a simple wet chemical approach. The Ag@TiO2 modified nanopigments were in the form of nanorods with an average size of about 20 nm as observed from TEM images. Increasing Ag content from 0.01 to 1.0% showed an increase in the mechanical properties of coated paper in terms of tensile, stretching, tensile energy absorption and burst while preserving the optical properties. Moreover, the antimicrobial inhibition activity increased with increasing the Ag content. The 1% Ag@TiO2 showed a long-lasting antimicrobial effect against Staphylococcus aureus (S. aureus) Gram-positive bacteria even after 25 years of ageing (93.4% inhibition). Investigation of reactive oxygen species (ROS) generation and reaction mechanism of antimicrobial activity over Ag/TiO2 under visible light is proposed. These results suggest that Ag/TiO2 NPs can be potentially used as a disinfection coating for paper and improving its mechanical properties. Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing the anti-ageing, antimicrobial activity and mechanical properties of surface-coated paper by Ag@TiO2-modified nanopigments

Samir

Geioushy

El-Sherbiny

et al. 2022

Environ Sci Pollut Res

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“…Furthermore, there is a small net negative charge at the broken edges on the kaolinite crystals, despite the neutral surface charge of kaolinite (Gruner 1932;Brindley and Robinson 1945). The applications of kaolinite clays involve ceramic, paper, medicine and cosmetics industries (Rhim et al 2013;El-Sherbiny et al 2015). Furthermore, the application of kaolinite in water treatment is growing rapidly in conjunction with other clay minerals, and H + ions released from the edge of the layer structure in acidic environments promote the adsorption of heavy metal ions, such as Pb(II), Cu(II), Hg(II) and Cd(II), from aqueous matrices (Bhattacharyya and Gupta 2008).…”

Section: Properties and Classification Of Claysmentioning

confidence: 99%

Clay mineral adsorbents for heavy metal removal from wastewater: a review

et al. 2018

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Heavy metal pollution such as water contamination by Pb, Hg, Cu, Cd and Cr ions is induced by rapid urbanization and industrialization and is a major threat to human health. One of the most efficient processes to clean contaminated water is adsorption. Adsorbents such as clay minerals and modified clays are efficient for the removal of metal ions from wastewater. This manuscript reviews current research in heavy metal adsorption by clay minerals such as halloysite, bentonite, montmorillonite, vermiculite and attapulgite, from 2013 to 2017, and highlights the main adsorption mechanisms. The structure, composition and synthesis of various clay minerals and modified clays are presented.

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“…The purification of hexahydrate crystals has been studied by Mahi et al [27] as part of a research aiming at alumina recovery. It was found that the solubility of aluminum chloride decreased sharply with increasing HCl concentration in the aqueous phase.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Kalapsha Kaolin to Prepare High Purity Alumina

Aly¹,

Ibrahim

Abadir

2019

Egypt. J. Chem.

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K ALABSHA kaolin was calcined at 700 o C then treated with hydrochloric acid to produce aluminum chloride hexahydrate. The hexahydrate was obtained in crystalline form through injection of hydrogen chloride gas in saturated solution and purified on several steps to obtain alumina of high purity. Acid leaching conditions, namely, acid to kaolin stoichiometric ratio(S), reaction time (t) and reaction temperature (T) were optimized using surface response methodology. A maximum alumina recovery of 83.2% was predicted on using 1.4 stoichiometric acid to solid ratio, a reaction temperature of 104 o C and a reaction time of 3 hours. This result was then assessed experimentally. The hexahydrate crystals obtained were subsequently purified in a three stage process to increase their purity to 99.961%. Calcination of these crystals for 4 hours at 1100 o C produced highly crystalline alumina with purity 99.9%.

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Enhancing Egyptian kaolinite via calcination and dealumination for application in paper coating

Cited by 12 publications

References 22 publications

Enhancing the anti-ageing, antimicrobial activity and mechanical properties of surface-coated paper by Ag@TiO2-modified nanopigments

Enhancing the anti-ageing, antimicrobial activity and mechanical properties of surface-coated paper by Ag@TiO2-modified nanopigments

Clay mineral adsorbents for heavy metal removal from wastewater: a review

Utilization of Kalapsha Kaolin to Prepare High Purity Alumina

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