Influence of thermal and acidic treatments on the morphology of a natural kaolinitic clay mineral

Song, Peng; Mahy, Julien G.; Calberg, Cédric; Farcy, Antoine; Caucheteux, Joachim; Fagel, Nathalie; Lambert, Stéphanie D.

doi:10.1016/j.rsurfi.2023.100131

Cited by 3 publications

(2 citation statements)

References 51 publications

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“…The peaks observed in the pristine clay and ceramic filters of 2θ at 21 indicate the presence of the quartz phase corresponding to ICDD:04-008-7651, while the peaks at 12 • (001), 33 • (020), 34 • (110), and 45 • (111) indicate the presence of the kaolinite phase corresponding to ICDD:01-083-0971. These peaks are well-fitted with the powder diffraction data of heterogenous phase of quartz and kaolinite from previous studies [25][26][27][28]. The XRD analysis reveals that the clay contains Si-O from silica.…”

Section: Xrd Analysissupporting

confidence: 79%

Ceramic Filters for the Efficient Removal of Azo Dyes and Pathogens in Water

Oaikhena,

Oluwalana-Sanusi,

Mokoena

et al. 2023

Ceramics

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Overcoming the scarcity of safe and sustainable drinking water, particularly in low-income countries, is one of the key challenges of the 21st century. In these countries, the cost of centralized water treatment facilities is prohibitive. This work examines the application of low-cost ceramic filters as point-of-use (POU) devices for the removal of methylene blue, o-toluidine blue, Staphylococcus aureus, and Staphylococcus typhi from contaminated water. The ceramic filters had typical kaolinite functional groups, making them suitable for the removal of dyes and pathogens. Surface charge measurements indicated strongly anionic filters, while thermal properties confirmed the carbonization of the biowaste additive leaving behind a porous kaolinite structure which subsequently dehydroxylated into meta kaolinite. In addition, morphological data showed heterogeneous filter surfaces. Increased biomass content improved the permeability, water adsorption, flow rate, and apparent porosity of the filter. The ceramic filter removed methylene blue (42.99–59.74%), o-toluidine (79.95–92.71%), Staphylococcus aureus (98–100%), and Staphylococcus typhi (75–100%). Overall, the study demonstrated the effectiveness of POU ceramic filters in removing organic pollutants in contaminated water while serving as disinfectants.

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Section: Xrd Analysissupporting

confidence: 79%

Ceramic Filters for the Efficient Removal of Azo Dyes and Pathogens in Water

Oaikhena,

Oluwalana-Sanusi,

Mokoena

et al. 2023

Ceramics

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“…This is because a certain concentration of acid can remove impurities such as metal ions and other inorganic substances such as Mg(Ⅱ) and Al(Ⅲ) on the surface of the ore, increase the specific surface area of the ore, unclog the pore channels and increase the adsorption capacity (España, Sarkar, Biswas, Rusmin, & Naidu, 2019). With the increase of acid concentration, the silica hydroxyl group on the surface of Kaolin decreases, the surface structure of the ore changes and becomes rougher, the specific surface area decreases, while the internal structure collapses, the pores are blocked, and the adsorption rate decreases as a result (Song, Mahy, Calberg, Farcy, Caucheteux, Fagel, & Lambert, 2023). The results show that among the four kinds of Kaolin treated with different pretreatment, the purified Kaolin had significantly better adsorption effect on antimony(Ⅲ) than acid-activated, thermally-activated and thermo-acid-activated Kaolin.…”

Section: Adsorption Efficiency Of Several Processed Kaolin For Sb(iii)mentioning

confidence: 99%

Preparation of Kaolin Composites and Its Adsorption for Sb(Ⅲ)

Luo,

Tang,

Zhang

et al. 2023

ASIR

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Antimony is an important element in the production of flame retardants and semiconductor materials. In the process of antimony mining, it may cause local environmental pollution, which has adverse effects on human health, and the development of economical and efficient adsorbents to remove antimony from wastewater has become a hot research topic. In this paper, the hydrothermal synthesis method was adopted, and purified Kaolin was selected as the carrier, potassium permanganate, manganese chloride and ferric chloride are the metal sources, urea is the precipitant, and sodium dodecyl benzene sulfonate is the structure guide agent. Under the conditions of 5% mass fraction of dispersant, loading temperature of 140 ℃, reaction time of 8 h, mass ratio of iron to manganese of 1.84:1, and mass of precipitant of 0.9 g, the composites prepared were effective in adsorbing the Sb(Ⅲ) from the wastewater. The optimum adsorption efficiency of the prepared composites on Sb(Ⅲ) is 92.83%, which showed excellent adsorption performance.

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