Investigation of the ion exchange effect on surface properties and porous structure of clay: Application of ascorbic acid adsorption

Anouar, F.; Elmchaouri, Abdellah; Taoufik, Nawal; Rakhila, Younes

doi:10.1016/j.jece.2019.103404

Cited by 10 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the results, we can conclude that the modification of Mt by the CTAB surfactant leads to a rough surface with the formation of small size aggregates. Moreover, the ion exchange increased the surface area of Mt, according to our previous laboratory study [38]. Furthermore, the SEM analysis confirms that the modification by CTAB was well conducted.…”

Section: Scanning Electron Microscopy Analysissupporting

confidence: 79%

Optimization of the Pentachlorophenol Adsorption by Organo-Clays Based on Response Surface Methodology

et al. 2022

View full text Add to dashboard Cite

The aim of this study is to optimize the adsorption of pentachlorophenol (PCP) using an organo-clay under the response surface methodology. The adsorbent was selected from a montmorillonite exchanged by various cations, such as Fe3+, Al3+, Zn2+, Mg2+, Na+, and modified by bromide cetyltrimethylammonium (CTAB) as surfactant. The obtained organo-montmorillonite was characterized using several techniques, such as Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and nitrogen adsorption, performed at −196 °C. The results showed an increase in basal space from 1.65 to 1.88 nm and a decrease in the specific surface and pore volume, with an increase in pore diameter, including the presence of characteristic bands of -CH2- and -CH3- groups at 2926 and 2854 cm−1 in the FTIR spectrum after the modification. The optimization of PCP removal by clay adsorbents is achieved using the response surface methodology (RSM) with a four-factor central composite model, including pH of solution, mass of adsorbent, contact time, and initial concentration. The results proved the validity of the regression model, wherein the adsorption capacity reaches its maximum value of 38 mg/g at a lower adsorbent mass of 20 mg, pH of 6, contact time (tc) of 5 h, and initial concentration of 8 mg/L.

show abstract

Section: Scanning Electron Microscopy Analysissupporting

confidence: 79%

Optimization of the Pentachlorophenol Adsorption by Organo-Clays Based on Response Surface Methodology

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Results from Table 9 and Appendix B show that whereas NH 4 + concentration diminishes, Ca 2+ and K + concentration increase. However, this phenomenon is not responsible for significant changes in OP for global and acid batches [ 65 ].…”

Section: Resultsmentioning

confidence: 99%

Quantifying Decay Due to Wet Atmospheric Deposition on Basalt

et al. 2023

View full text Add to dashboard Cite

The study of building materials is important for a better conservation of built heritage. Worldwide, volcanic stones (including basalt, andesite and dacite) are among the least studied building materials. In this research, the decay of a red basalt due to wet atmospheric deposition was studied. Red basalt was exposed to artificial rain solutions, prepared from rain samples collected weekly from 2014–2019. In this research, the decay of stone-built heritage was indirectly studied emulating wet atmospheric accelerated weathering under three different volume weighted mean (VWM) compositions: global, acid and no-acid categories. Lixiviates were analyzed to better understand the deterioration mechanisms taking place inside the material. Decay was quantified as mass difference, water absorption capacity (WAC) and open porosity (OP) changes. Results show that the methodology used is suitable to research the decay of built heritage. The studied basalt is indeed prone to decay by wet atmospheric deposition. The main decay mechanisms are the washing of insoluble compounds, dissolution of minerals, salt crystallization and cation exchange. WAC and OP showed promising results of their appropriateness as monitoring variables of decay in situ. Acid conditions produce the most severe decay, but Ph effect is not as important as precipitation volume. Non-linear equations relating volume of precipitation with mass difference in red basalt are presented.

show abstract

“…In particular, bentonite, a material mainly composed of the mineral montmorillonite, arises as an interesting carrier for LAA. LAA incorporation in montmorillonite was reported, although no evidence of drug photoprotection and antioxidant capacity was established for the composite material [8,24,25] (see Supplementary Materials S1).…”

Section: Introductionmentioning

confidence: 99%

Antioxidant Efficacy and “In Vivo” Safety of a Bentonite/Vitamin C Hybrid

et al. 2023

View full text Add to dashboard Cite

L-ascorbic acid (LAA), commonly known as vitamin C, is an excellent and recognized antioxidant molecule used in pharmaceutical and cosmetic formulations. Several strategies have been developed in order to preserve its chemical stability, connected with its antioxidant power, but there is little research regarding the employment of natural clays as LAA host. A safe bentonite (Bent)—which was verified by in vivo ophthalmic irritability and acute dermal toxicity assays—was used as carrier of LAA. The supramolecular complex between LAA and clay may constitute an excellent alternative, since the molecule integrity does not seem to be affected, at least from the point of view of its antioxidant capacity. The Bent/LAA hybrid was prepared and characterized through ultraviolet (UV) spectroscopy, X-ray diffraction (XRD), infrared (IR) spectroscopy, thermogravimetric analysis (TG/DTG) and zeta potential measurements. Photostability and antioxidant capacity tests were also performed. The LAA incorporation into Bent clay was demonstrated, as well as the drug stability due to the Bent photoprotective effect onto the LAA molecule. Moreover, the antioxidant capacity of the drug in the Bent/LAA composite was confirmed.

show abstract

Investigation of the ion exchange effect on surface properties and porous structure of clay: Application of ascorbic acid adsorption

Cited by 10 publications

References 35 publications

Optimization of the Pentachlorophenol Adsorption by Organo-Clays Based on Response Surface Methodology

Optimization of the Pentachlorophenol Adsorption by Organo-Clays Based on Response Surface Methodology

Quantifying Decay Due to Wet Atmospheric Deposition on Basalt

Antioxidant Efficacy and “In Vivo” Safety of a Bentonite/Vitamin C Hybrid

Contact Info

Product

Resources

About