Influence of different wet milling on the properties of an attapulgite clay, contribution of inverse gas chromatography

Boudriche, Lilya; Calvet, Rachel; Chamayou, Alain; Hamdi, Boualem

doi:10.1016/j.powtec.2020.09.045

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…Here, ∆𝐺 [𝐶𝐻 2 ] is the Gibbs free energy of a surface including only the -CH2 group, calculated according to equation (5). 𝑎 [𝐶𝐻 2 ] refers to the surface area of the -CH2 group (0.06 nm 2 ).…”

Section: −∆𝐺 [𝐶𝐻mentioning

confidence: 99%

“…Several different types of volatile chemicals can be examined using gas chromatography (1-3). Nevertheless, this technique cannot be used to analyze large molecular weights and non-volatile components such as lignocellulosic materials (4), clays (5), liquid crystals (6), polymers (7), and composites (8). To examine such compounds, inverse gas chromatography (IGC) was improved for the task (9)(10)(11).…”

Section: Introductionmentioning

confidence: 99%

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Surface Physicochemical Characterization of Shepherd’s Purse (Capsella bursa-pastoris) by Inverse Gas Chromatography

ISİK

2023

Journal of the Turkish Chemical Society Section A: Chemistry

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Shepherd’s purse (Capsella bursa-pastoris) is one of the plants widely utilized in conventional medicine and can grow in different parts of the world. The determination of the surface properties of a solid material is extremely important for the industrial use of the material and the improvement of material properties. Therefore, in this study, this plant was used as a stationary phase, and its surface characterization was performed by inverse gas chromatography technique. In this context, firstly, the plant was prepared with several pretreatments to be used in the experimental tests. The V_N values were found from the retention data obtained by passing organic solvents over the plant filled into the chromatographic column in the temperature range of 303.2–328.2 K and linear retention diagrams were drawn. The γ_S^D of the plant was calculated according to Schultz, Dorris-Gray, and Donnet-Park methods, and the suitability of the methods was compared. The 〖∆G〗_A^S values were calculated with the data obtained from the Schultz method, and the 〖∆H〗_A^S values were calculated using these data. The acidity and basicity of the plant surface were examined. According to the K_D⁄K_A value (0.93), it was determined that the surface of the plant was acidic.

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Section: −∆𝐺 [𝐶𝐻mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Physicochemical Characterization of Shepherd’s Purse (Capsella bursa-pastoris) by Inverse Gas Chromatography

ISİK

2023

Journal of the Turkish Chemical Society Section A: Chemistry

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“…At present, a series of physical and chemical modification methods are used for the dissociation and dispersion of attapulgite. Different physical methods [11][12][13][14][15][16], such as ball milling, extrusion, ultrasonic crushing, and high-pressure homogenization, have been used to dissociate the attapulgite crystal bundles to improve their specific surface area, porosity and dispersion. Wang et al [16] investigated the dispersion of attapulgite with ethanol during high pressure homogenization to obtain a single nanorod crystal.…”

Section: Introductionmentioning

confidence: 99%

Novel preparation of attapulgite-reduced graphene oxide hydrogel composite and its application in flexible solid-state supercapacitors

Huang¹,

Wu²

2022

Nanotechnology

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After graphite oxide assisted the liquid phase shear exfoliation of attapulgite, the good dissociation and dispersion of attapulgite rod crystals are realized. Due to the spatial hindrance effect of attapulgite, which prevents the stacking of RGO sheets, the attapulgite-reduced graphene oxide three-dimensional porous hydrogel with abundant pore structure enables rapid transfer of electrolyte ions and exhibits good electrochemical performance and rate performance. The assembled flexible solid-state supercapacitor has a high operating voltage window and good flexibility and cycle stability. At a current density of 0.1 mA/cm2, it has an area specific capacitance of 127.33 mF/cm2. A series of solid-state supercapacitors can be used as the power supply for LED lights.

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“…Because of the abundance of clays on the earth's surface and due to their ability to undergo transformations in different ways, these solids are involved in many applications: pharmaceuticals, petroleum, chemical, wastewater treatment, catalysis, etc (Boudriche et al 2021); consequently, clays have received considerable attention, especially as potential adsorbents for environmental research (Birhanu et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Removal performance for thermotolerant coliforms and fecal streptococci from dairy effluents by Kenadsa’s natural green clay (Bechar-Algeria) in a fixed-bed column

et al. 2021

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This present work is a part of the liquid discharges treatment topic by studying the removal performance for thermotolerant coliforms (FC) and fecal streptococci (F.Strep) by a local natural light green clay from Kenadsa (Bechar-Algeria) under continuous adsorption processes in a fixed-bed column. The study estimated the clay adsorbing efficiency by the adsorption technique for bacteria contaminating the dairy effluent by determining the bacterial load before and after treatment. The mean log counts per 100 ml for FC and F.Strep were assessed by MPN method on liquid medium. The clay material characterizations were made through X-ray diffraction, X fluorescence spectrometry and Fourier transform infrared spectroscopy analysis. Besides, some parameters were estimated such as the breakthrough time tb (clay filter breakdown); the amount of the contaminating bacteria that was removed at the breakthrough time Xb and the exhaustion of disinfection capacity Xe; the total amount of contaminating bacteria flowing through the column Xtotal; and the total removal efficiency (Y). According to the XRD, XRF and FTIR results, the predominant mineral constituents were silicon dioxide, aluminum oxide, ferric oxide and magnesium oxide with rates of 59,44; 18,09; 7,79; and 3,87%, respectively, and hence, their classification among non-swelling clay minerals, illite is the major mineral group of this material. The results of the bacteriological analysis of raw dairy effluents showed an average bacterial load of 3,88 Log10 and 4,1 Log10 CFU/100 mL for FC and F.Strep, respectively, exceeding the thresholds set by the national and the international regulations. The results of the dairy effluents treated by the tested material have shown that the used clay has a relatively high adsorption property for the clay fixed-bed system (3 cm of bed height), expressed by a total removed efficiency Y (%) of FC and F.Strep used to evaluate the column performance ranging from 55 to 84%. It gives a higher log removal for FC and F.Strep (0.98–1.65 Log10) reported from the first adsorption process, and a breakthrough time ranged from 100 to 250 min, which was inversely proportional to the initial bacterial load of discharges and also linked to the nature of the bacterial contaminants. When the breakthrough occurs earlier, the column service life will be shortened. For the studied parameters, the results of treated effluent complied with national and WHO regulations for unrestricted agricultural irrigation, otherwise, as authorized effluents to be discharged into nature without risks. These preliminary results are very promising at laboratory scale as an innovative green technology, treatment method respecting the environment and opens up prospects for the future, where the modification or the optimization of operating conditions such as the bed height of the fixed bed for adsorption, the volumetric flow rate or the clay structure like the particle size distribution of the adsorbents, known as one of the adsorbent classes endowed with an antimicrobial property, can improve the column performance, and further, the removal or even more the disinfection process by adsorption method.

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Influence of different wet milling on the properties of an attapulgite clay, contribution of inverse gas chromatography

Cited by 15 publications

References 24 publications

Surface Physicochemical Characterization of Shepherd’s Purse (Capsella bursa-pastoris) by Inverse Gas Chromatography

Surface Physicochemical Characterization of Shepherd’s Purse (Capsella bursa-pastoris) by Inverse Gas Chromatography

Novel preparation of attapulgite-reduced graphene oxide hydrogel composite and its application in flexible solid-state supercapacitors

Removal performance for thermotolerant coliforms and fecal streptococci from dairy effluents by Kenadsa’s natural green clay (Bechar-Algeria) in a fixed-bed column

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