Effects of pH on the gel properties of montmorillonite, palygorskite and montmorillonite-palygorskite composite clay

Cui, Jiarui; Zhang, Zepeng; Han, Feng

doi:10.1016/j.clay.2020.105543

Cited by 61 publications

(23 citation statements)

References 15 publications

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“…Palygorskite, chlorite, muscovite, and quartz are found as the predominant clay minerals [68,85,86]. In the XRD analysis, it was also revealed that diffraction grating of Palygorskite was 10.75 A °and was observed as the abundant clay mineral [87]. Palygorskite (also known as attapulgite) is porous in nature, exhibits a higher adsorptive capacity, and resembles fibrous clay mineral.…”

Section: Experimental Investigationmentioning

confidence: 95%

Isolated Effect and Sensitivity of Agricultural and Industrial Waste Ca‐Based Stabilizer Materials (CSMs) in Evaluating Swell Shrink Nature of Palygorskite‐Rich Clays

Jalal

Jamhiri

Naseem

et al. 2021

Advances in Civil Engineering

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This paper evaluates the suitability of sugarcane bagasse ash (SCBA) and waste marble dust (WMD) on the geotechnical properties of Palygorskite-rich expansive clays located in northwest Pakistan. These problematic soils exhibit undesirable characteristics which greatly affect the pavements, boundary walls, slab-on-grade members, and other civil engineering infrastructures. A series of geotechnical tests were performed on soil specimens using prescribed percentages of the aforementioned Ca-based stabilizer materials (CSMs). The investigation includes X-Ray Diffraction (XRD) Analysis, Scanning Electron Microscopy (SEM), X-Ray Fluorescence (XRF) tests, and physicomechanical properties such as moisture-density relationship, Atterberg’s limits, swell pressure, and an ANN-based sensitivity analyses of overall swell pressure development. The outcomes of these experimental investigations showed that the addition of CSMs into the expansive soils increased to 4% SCBA and 10% WMD, the plasticity index reduced by 30% and 49%, the volumetric swell decreased from approximately 49% to 86% and 63%, and the swelling pressure reduction was from 189 kPa to 120 kPa and 160 kPa (about 15% and 36%), respectively. It is interesting to note that replacement with specified CSM accelerated the strength of soil at extended curing periods and the optimum improvement in the strength behavior of the soil was also recorded. Moreover, with addition of the respective CSMs, the compactability and strength characteristics were ameliorated, while plasticity was significantly lowered. Given the amount of SCBA and WMD produced annually, their utilization for the stabilization of problematic soils, even in relatively low concentrations, could potentially have a substantial impact on the sustainable reuse of these waste materials.

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Section: Experimental Investigationmentioning

confidence: 95%

Isolated Effect and Sensitivity of Agricultural and Industrial Waste Ca‐Based Stabilizer Materials (CSMs) in Evaluating Swell Shrink Nature of Palygorskite‐Rich Clays

Jalal

Jamhiri

Naseem

et al. 2021

Advances in Civil Engineering

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“…Sodium-montmorillonite (Na + -Mt) (Cloisite ® Na, Southern Clay Products, Gonzales, TX, USA) having cation exchange capacity (CEC) = 92.6 meq/100 g and the basal spacing = 1.16 nm) was received from Southern Clay Products, Gonzales, TX, USA ( [34]. Acid Blue 25 dye was purchased from Sigma-Aldrich (Steinheim, Poly(succinimide-co-aspartate) copolymer 1:1 residue ratio (aspartate: succinimide), α,α'-dichloro-pxylene, benzyl chloride, methyl iodide, N,N,N',N'-tetramethylethylenediamine (TMEDA), and N,Ndimethyldecylamine were obtained from Folia, Inc., (Birmingham, AL, USA).…”

Section: Methodsmentioning

confidence: 99%

Polyaspartate-Ionene/Na+-Montmorillonite Nanocomposites as Novel Adsorbent for Anionic Dye; Effect of Ionene Structure

et al. 2020

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Surface modification of sodium montmorillonite (Na+-Mt) was performed using antimicrobial agents to produce an ecofriendly nanocomposite. The adsorption performance of the nanocomposite has been evaluated for the removal of Acid Blue 25 dye (AB25) as a model organic pollutant from wastewater. Sodium montmorillonite (Na+-Mt) was modified with three different ionene compounds through ion exchange, and further modified through reaction with polyaspartate to provide three ecofriendly nanocomposites (denoted ICP-1–3). The nanocomposites were characterized using FTIR, PXRD, TEM, SEM, and BET surface area. The adsorption isotherm of AB25 onto ICP-1, ICP-2 and ICP-3 was analyzed using the Langmuir, Freundlich, and Dubinin–Radushkevich (D–R) models. The adsorption isotherm was found to be best fitted by a Freundlich model. The thermodynamic parameters were calculated. The kinetics of the adsorption data were analyzed and the adsorption behavior was found to obey pseudo-second-order kinetics, and the intraparticle diffusion model. The adsorption mechanism was studied by FTIR.

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“…This is why the clay:solution ratio of 1:1000 (0.02 g:20 mL) was used. This ratio is often applied when the zeta potential is measuring [22,23].…”

Section: Methodsmentioning

confidence: 99%

Sorption of Cu2+ Ions by Bentonite Modified with Al Keggin Cations and Humic Acid in Solutions with pH 4.5

et al. 2020

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The sorption of Cu2+ onto bentonite modified with Al Keggin cations and humic acid from CuCl2 solutions at pH 4.5 was studied. Modification of Na-bentonite with Al Keggin cations was found to result in an increase in the basal spacing of montmorillonite from 1.29 nm for N-form to 1.85 and 1.78 nm for HAl13 and Al13 forms respectively, in a reduction of CEC (cation exchange capacity) and in the formation of additional sites with a variable charge with pHPZC 4.2. Al13-bentonite is not affected by heat. Under the conditions of the experiments at pH of 4.5 Na-bentonite adsorbs more Cu2+ from CuCl2 solutions then Al13 forms of bentonites. The main mechanism of copper sorption on Na-bentonite is the cation exchange Cu2+–Na+. The reduction of CEC of Na-bentonite after modification with Al Keggin cations leads to a decrease in the Cu2+ sorption. pH-dependent sorption sites on Al13-bentonites have a pHPZC of 4.2 and, therefore, under conditions of the experiment have positive charge which prevents Cu2+ sorption. Na-bentonite adsorbs more humic acid solution (HA) then Al13-bentonite and the proportion of adsorbed HA remains constant over the entire concentration range. Treatment of the Al13-bentonite with HA leads to the formation of the additional sorption sites. The amount of sorbed Cu2+ and the percentage of their extraction from solutions by HAAl13-bentonite is similar to those values for Na-bentonite.

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Effects of pH on the gel properties of montmorillonite, palygorskite and montmorillonite-palygorskite composite clay

Cited by 61 publications

References 15 publications

Isolated Effect and Sensitivity of Agricultural and Industrial Waste Ca‐Based Stabilizer Materials (CSMs) in Evaluating Swell Shrink Nature of Palygorskite‐Rich Clays

Isolated Effect and Sensitivity of Agricultural and Industrial Waste Ca‐Based Stabilizer Materials (CSMs) in Evaluating Swell Shrink Nature of Palygorskite‐Rich Clays

Polyaspartate-Ionene/Na+-Montmorillonite Nanocomposites as Novel Adsorbent for Anionic Dye; Effect of Ionene Structure

Sorption of Cu2+ Ions by Bentonite Modified with Al Keggin Cations and Humic Acid in Solutions with pH 4.5

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