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Synthesis and Characterization of Novel Thin Films Using Spin and Dip Coating Techniques: Applications to the Adsorption of 4‐Nitrophenol and Methyl Orange in Single and Mixed Systems
Author(s) -
Chahih Amina Amel,
Zermane Faiza,
Cheknane Benamar,
Keffous Aissa,
Bouras Omar
Publication year - 2025
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202501422
Abstract The objective of the study was to synthesize new adsorbent materials in uniform films, based on two synthetic iron (oxy)hydroxides with polyvinyl chloride. A sol–gel process was employed using two deposition techniques: spin coating and dip coating. These films were characterized using a combination of analytical techniques to confirm the successful incorporation and homogeneous distribution of iron (oxy)hydroxides within the PVC matrix. X‐ray fluorescence analysis revealed a significant reduction in Fe 2 O 3 content from ∼98.2% in pure goethite and ∼97.7% in HFO to 54.2% and 47.6%, respectively, in their composite films. Textural analysis showed reductions in specific surface areas from 151.3 to 14.76 m 2 g⁻¹ for (HFO/PVC) composites and from 135.3 to 13.11 m 2 g⁻¹ for (goethite/PVC) matrices. Adsorption studies of 4‐nitrophenol and methyl orange were performed in batch mode, both in single‐component systems and binary mixtures. Kinetic studies showed that the pseudo‐first‐order model provided the best fit ( R 2 ≥ 0.92). Adsorption isotherms revealed that the Freundlich model best described single‐component systems, indicating heterogeneous surface adsorption. In binary systems, three adsorption weight ratios (r = (4‐nitrophenol/ methyl orange) = 1/3, 1 and 3 w/w) showed that the Sheindorf–Rebhun–Sheintuch (SRS) model, accurately described simultaneous adsorption, suggesting a cooperative adsorption mechanism.
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