The mechanism of anionic polyacrylamide adsorption on the montmorillonite surface in the presence of Cr(VI) ions

Wiśniewska, Małgorzata; Fijałkowska, Gracja; Szewczuk-Karpisz, Katarzyna

doi:10.1016/j.chemosphere.2018.07.198

Cited by 55 publications

(18 citation statements)

References 25 publications

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“…Similar behaviour is typically observed for the aqueous suspensions of metal oxides in the presence of simple anions, molecules of dyes and surfactants of the anionic character (Skwarek et al 2014;Wawrzkiewicz et al 2015;Wiśniewska et al 2018a). In the case of anionic polymers containing negatively charged groups connected with each segment in the macromolecule [e.g.…”

Section: Resultssupporting

confidence: 76%

Adsorption mechanism of poly(vinyl alcohol) on the surfaces of synthetic zeolites: sodalite, Na-P1 and Na-A

et al. 2019

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The structure of poly(vinyl alcohol)-PVA layers adsorbed on the synthetic zeolites surfaces was determined. Three zeolites: sodalite, Na-P1 and Na-A were obtained using hydrothermal conversion of fly ash with aqueous sodium hydroxide. The effects of solution pH and zeolite type on the adsorption mechanism of the polymer were examined. The analysis of the results obtained by means of spectrophotometric and microelectrophoretic measurements as well as potentiometric titrations enabled description of interfacial behaviour of adsorbed macromolecules. It was shown that the presence of poly(vinyl alcohol) layers modifies the surface properties of applied zeolites. The evidence of this are changes in the surface charge density and zeta potential of solid particles observed in the polymer presence. Moreover the PVA chains exhibit different adsorption affinity for the examined zeolites depending mainly on the mean pore size of these aluminosilicates which is very important for penetration of internal zeolite structure by polymeric macromolecules.

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Section: Resultssupporting

confidence: 76%

Adsorption mechanism of poly(vinyl alcohol) on the surfaces of synthetic zeolites: sodalite, Na-P1 and Na-A

et al. 2019

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“…The high degradation efficiency at acidic conditions may be explained by the electrostatic interactions between the positively charged adsorbent and the negatively charged pollutant . Acidic conditions were favorable because of the charge on the adsorbent and the pollutant . Because of this, the interaction of 2,4‐DCP and the AC at low pH values increased, as expected, and the adsorption capacity declined (Figure ).…”

Section: Resultssupporting

confidence: 56%

Adaptive neuro‐fuzzy inference system modeling of 2,4‐dichlorophenol adsorption on wood‐based activated carbon

Alver

Baştürk

Tulun

et al. 2020

Env Prog and Sustain Energy

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Phenolic compounds cause significant problems both in drinking water and wastewater due to their toxicity, high oxygen requirements, and low biodegradability. They are listed as primary pollutants by the United States Environmental Protection Agency and the European Union. In this study, the adsorption efficiency of 2,4‐dichlorophenol (2,4‐DCP) on activated carbon, which is commonly used in treatment plants, was investigated under different experimental conditions including adsorbent dose, initial phenol concentration, initial pH, and contact time. As a result of experimental studies, it was determined that the adsorption isotherm and kinetics could be perfectly fitted to Langmuir and the assumption of pseudo‐second order model, respectively. Then, the adaptive neuro‐fuzzy inference system (ANFIS) model was developed, which was the primary purpose of this study. The correlation between training and testing data and the ANFIS output was over 0.999. The generalization ability of the model was found to be 0.999. The input variables such as adsorbent dosage (14.2%), initial concentration (14.6%), initial pH (13.9%), and the contact time (57.2%) showed a higher effect on 2,4‐DCP removal efficiency in the sensitivity analysis. To summarize, modeling studies that are frequently preferred in treatment plants for the removal of different pollutants will reduce the number of experiments harmful to human health and save time, labor, and economy.

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“…Specific surface area and porosity of montmorillonite were determined using a low-temperature nitrogen adsorption/ desorption method. The obtained results were presented in our previous paper (Wiśniewska et al 2018). The specific surface area of the examined 2:1 type aluminosilicate is equal to 259 m 2 /g.…”

Section: Adsorbent Characteristicmentioning

confidence: 72%

“…The elemental composition of the mineral was determined by the XRF technique (Panalytical ED-XRF type Epsilon 3 spectrometer). Montmorillonite textural properties and elemental composition of the adsorbent were described in our previous paper (Wiśniewska et al 2018). Using the high resolution scanning electron microscope Quanta 3D FEG (FEI, Field Electron and Ion Co.) the SEM images of clay mineral without or with the flocculant were obtained.…”

Section: Materials and Their Characteristicsmentioning

confidence: 99%

Comparison of adsorption affinity of anionic and cationic polyacrylamides for montmorillonite surface in the presence of chromium(VI) ions

et al. 2018

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Erosion, which is considered to be global problem, is the process of soil environment degradation due to the impact of wind (soil blowing, deflation) and water (soil washing, deep erosion). This leads to destruction of its structure, nutrients removal and finally bedrock exposition and desertification. One of the ways to prevent this phenomenon is the soil conditioners usage. These substances, also called soil flocculants, are macromolecular compounds which contribute to the reinforcement of soil structure as a result of its adsorption on the mineral surface. The soil conditioners commonly used in agriculture is ionic polyacrylamide (PAM)-both anionic and cationic. These macromolecular substances affect soil surface properties and adsorption behaviour of substances present in the environment-nutrients, organic molecules and also hazardous compounds as well as toxic heavy metals (i.e. chromium(VI) ions). The aim of this study was to investigate the impact of solution pH, type of ionic groups in the polyacrylamide macromolecules and chromium(VI) ion concentration on the adsorption mechanism of Cr(VI) and PAM on the montmorillonite surface. The adsorption and electrokinetic properties of the montmorillonite-AN PAM or CT PAM/Cr(VI) systems were examined by means of spectrophotometry, potentiometric titration, SEM, XRD and DRS methods. It was shown that in the adsorbed layer composed of PAM-Cr(VI) complexes reduction of Cr(VI) to Cr(III) takes place.

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The mechanism of anionic polyacrylamide adsorption on the montmorillonite surface in the presence of Cr(VI) ions

Cited by 55 publications

References 25 publications

Adsorption mechanism of poly(vinyl alcohol) on the surfaces of synthetic zeolites: sodalite, Na-P1 and Na-A

Adsorption mechanism of poly(vinyl alcohol) on the surfaces of synthetic zeolites: sodalite, Na-P1 and Na-A

Adaptive neuro‐fuzzy inference system modeling of 2,4‐dichlorophenol adsorption on wood‐based activated carbon

Comparison of adsorption affinity of anionic and cationic polyacrylamides for montmorillonite surface in the presence of chromium(VI) ions

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