Effect of treating a PVC/Aliquat-336 polymer adsorbent with sodium hydroxide on chromium (VI) adsorption

A PVC adsorbent doped with Aliquat-336 was prepared with the phase inversion method for application to hexavalent chromium adsorption. Scanning electron microscopy (SEM) and BET analysis were used to identify its morphology and texture. SEM images revealed an asymmetrical structure with a macro-poro...

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Bibliographic Details
Published in:International journal of environmental analytical chemistry 2024-12, Vol.104 (17), p.4946-4962
Main Authors: Ouazine, Louanas, Bey, Said, Benamor, Mohamed
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Aliquat
Aqueous solutions
Chromium
chromium (VI)
Diffusion layers
Electron microscopy
Hexavalent chromium
Hydroxides
Kinetics
NaOH treatment
Polymer adsorbent
Polymers
Polyvinyl chloride
Scanning electron microscopy
Sodium
Sodium hydroxide
Surface layers
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Summary:A PVC adsorbent doped with Aliquat-336 was prepared with the phase inversion method for application to hexavalent chromium adsorption. Scanning electron microscopy (SEM) and BET analysis were used to identify its morphology and texture. SEM images revealed an asymmetrical structure with a macro-porous interior layer and a thin micro-porous top layer. BET analysis showed that the adsorbent had a low specific surface area. The polymer adsorbent was treated with a sodium hydroxide solution. Both treated and untreated adsorbents were utilised to adsorbate hexavalent chromium from an aqueous solution. The adsorption was carried out under different experimental conditions. Adsorption takes 48 h to reach equilibrium. The intraparticle diffusion mechanism controls adsorption kinetics, while the Langmuir model describes the adsorption isotherm. The treatment of the PVC adsorbent with sodium hydroxide enhances its maximum adsorption capacity from 47.3 mg g −1 to 69.05 mg g −1 .
ISSN:0306-7319
1029-0397
DOI:10.1080/03067319.2022.2115900