Removal of chlorobenzene by adsorption from aqueous solutions on the HDTMA-bentonites as a function of HDTMA/CEC ratio

Bougdah, Nabil; Messikh, Nabil; Bousba, Salim; Djazi, Fayçal; Magri, Pierre; Rogalski, Marek

doi:10.1016/j.crgsc.2020.100038

Cited by 11 publications

(7 citation statements)

References 32 publications

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“…In the presence of Maghnite layers, the electrical conductivity of polymer materials improves. This is due to the progressive development of continuous conductive channels in the polymer, which facilitates the transfer of electrical current [36] . Percolation threshold refers to the critical amount of conducting load required to produce the insulating‐conducting transition.…”

Section: Resultsmentioning

confidence: 99%

Influence of Clay on Structure, Thermal Properties and Mechanics of Poly(vinyl acetate)/Maghnite Nanocomposites.

Mrah

Khiati

2023

ChemistrySelect

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Poly (vinyl acetate) (PVAC) based on Algerian clay maghnite was synthesized by an emulsion polymerization process in the present study. The prepared nanocomposites were analyzed by means of FTIR, UV‐visible, XRD, AFM, SEM, TGA and optical microscopy. The results obtained showed a semi‐crystalline structure of the composite system revealed by the XRD scheme. The addition of maghnite to the fillers up to 5 wt % has been shown to reduce the optical band gap energy, while the refractive index is greatly increased. The presence of maghnite in PVAC leads to an increase in surface roughness as measured by AFM analysis. The thermal stability of PVAC was significantly improved by the presence of maghnite in the polymer matrix. The mechanical test results indicate that the tensile strength of the polymer composites was improved by the increase in the concentration of clay platelets. The electrical property data show that as the frequency increases, the dielectric constant decreases and the electrical conductivity increases. The loading content of composites also influences their electrical and mechanical properties. This widens the range of applications for these materials in flexible electronics and in conductive coatings.

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Section: Resultsmentioning

confidence: 99%

Influence of Clay on Structure, Thermal Properties and Mechanics of Poly(vinyl acetate)/Maghnite Nanocomposites.

Mrah

Khiati

2023

ChemistrySelect

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“…The intensities of the two strong adsorption bands at 2933 and 2858 cm-1 represent the antisymmetric and symmetric CH 2 stretching modes of the amine, respectively, and they proportionally increase the stacking density of the ammonium chains in maghnite galleries. [27] Figure 2 shows the FTIR spectra of 12-Mag, pure TPU and the different TPU% nanocomposites that were synthesized.The infrared spectrum curve of the nanocomposites is in perfect adequacy with that of the pure polyurethane, we discern numerous bands characterizing the PU, more exactly a band noted around 1737 cm -1 and which is due to the stretching of the carbonyl group associated with the urethane grouping HN-COOCH of the ester function. Two bands appeared at 1526 and 1249 cm -1 respectively which are due to the deformation of the out-of-plane NH group and the expansion of the C-N group.…”

Section: Ftir Analysismentioning

confidence: 99%

Impact of clay modifier on structure, thermal, mechanical and transport properties in polyurethane/Maghnite nanocomposites as barrier materials

Khiati

Mrah

2023

Iran Polym J

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In the present study, thermoplastic polyurethane (TPU) nanocomposites based on maghnite as an inorganic reinforcing phase were synthesized. The result of this study was to evaluate the gas barrier property of a thermoplastic polyurethane (TPU) material containing clay nanoparticles. The preparation of the thermoplastic polyurethane prepolymer with NCO terminations was carried out by the in situ solution polymerization method. The clay was previously modi ed by intercalating 12-aminododecanoic acid NH 2 (CH 2 ) 11 COOH (12-Mag) molecules. The polyethylene glycol / tolylene 2,4-diisocyanate (PEG/TPI) matrix was extensively compatibilized with the organo-modi ed clay, 12-Maghnite. The objective of this study is to evaluate the effects of the use of organoclay on the development of thermoplastic polyurethane (TPU) nanocomposites composed of 1, 3, 5 and 7 wt% organoclay. The results obtained by XRD, by Transmission and Scanning Electron Microscopy (TEM, SEM) revealed that the modi ed maghnite was well dispersed at 1 wt% in the polyurethane matrix. Thermogravimetric (TG) tests have shown that the nanocomposites samples also have better thermal stability. Using the membrane separation test device, gas permeability was examined. Signi cant improvements in barrier properties were observed. The mechanical properties of the nanocomposites were evaluated as a function of the clay ller used and the TPU matrix.

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“…The sodium exchanged form of the bentonite (Na-bentonite) was prepared from Algerian natural bentonite according to the procedure described in our previous work [4]. To improve the adsorption capacity of natural bentonite, Na-bentonite has been modified with a cationic surfactant hexadecyltrimethylammonium bromide (HDTMA).…”

Section: Preparation Of Hdtma-bentonitementioning

confidence: 99%

“…To improve the adsorption capacity of natural bentonite, Na-bentonite has been modified with a cationic surfactant hexadecyltrimethylammonium bromide (HDTMA). The sodium-exchanged bentonite sample (20 g) previously modified using the ion exchange method was stirred magnetically for 48 h at room temperature with 200 mL of HDTMA aqueous solution [4,39]. The prepared HDTMAbentonite was washed with deionized water until a negative bromide test had been obtained with 0.1 M AgNO 3 (VWR Prolabo-chemical, Spain).…”

Section: Preparation Of Hdtma-bentonitementioning

confidence: 99%

“…It has raised serious concerns because it is chemically stable, toxic, persistent, and bioaccumulative. The wide use of chlorobenzene in numerous industrial applications has led to its widespread release into the environment and consequent contamination of soil and water resources [4][5][6][7]. CB can accumulate in the human body through the food chain, causing many diseases such as cancer, teratogenesis, mutagenesis, anaesthetic effects, and can damage the central nervous system [8,9].…”

Section: Introductionmentioning

confidence: 99%

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Application of multilayer perceptron network and random forest models for modelling the adsorption of chlorobenzene on a modified bentonite by intercalation with hexadecyltrimethyl ammonium (HDTMA)

Bougdah

Bousba

Belhocine

et al. 2021

Reac Kinet Mech Cat

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Prediction of adsorption capacity, one of the most important properties of any adsorbent-adsorbate system, is crucial for adsorption studies. In this investigation, two approaches such as multilayer perceptron (MLP) and random forest (RF) were used to predict the adsorption capacity of hexadecyltrimethyl ammonium modified bentonite to remove chlorobenzene (CB) from aqueous solution. The adsorption study was conducted in batch mode at different adsorption parameters. The results show that the adsorption processes were best described by Freundlich isotherm model, while the adsorption mechanism followed the pseudo-second order kinetics. It was observed that the structure of MLP model that give the best prediction consisted of three layers: input layer with four neurons, output layer with one neuron, and four neurons at hidden layer. The three important parameters for RF model were n tree = 500, m try = 1, and node size = 1. According to the results obtained, the MLP model provided slightly higher levels of accuracy with a consistently high coefficient of determination (R 2 = 0.996) and low root mean square error (RMSE = 0.00101) compared to RF model. (R 2 = 0.969, RMSE = 0.03008). Therefore, the initial concentration of CB with 35.29%, appeared to be the most influential parameter in the adsorption of CB on the modified bentonite.

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Removal of chlorobenzene by adsorption from aqueous solutions on the HDTMA-bentonites as a function of HDTMA/CEC ratio

Cited by 11 publications

References 32 publications

Influence of Clay on Structure, Thermal Properties and Mechanics of Poly(vinyl acetate)/Maghnite Nanocomposites.

Influence of Clay on Structure, Thermal Properties and Mechanics of Poly(vinyl acetate)/Maghnite Nanocomposites.

Impact of clay modifier on structure, thermal, mechanical and transport properties in polyurethane/Maghnite nanocomposites as barrier materials

Application of multilayer perceptron network and random forest models for modelling the adsorption of chlorobenzene on a modified bentonite by intercalation with hexadecyltrimethyl ammonium (HDTMA)

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