Synthesis and characterization of TiO₂-Montmorillonite/Polythiophene-SDS nanocomposites: Application in the sonophotocatalytic degradation of rhodamine 6G

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• 作者：Nadjia Khalfaoui-Boutoumi ; Hocine Boutoumi ; Hussein Khalaf ; Bernard David
• 关键词：Montmorillonite ; Rhodamine 6G ; Hybrid material ; Polythiophene ; TiO2 ; Sonophotocatalysis
• 刊名：Applied Clay Science
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：80-81
• 期：Complete
• 页码：56-62
• 全文大小：960 K

文摘

Titanium dioxide-montmorillonite/Polythiophene-sodium dodecyl sulphate (TiO₂-Mt/PTP-SDS) nanocomposites were synthesized via the in situ intercalative oxidative polymerization of thiophene (TP) in TiO₂-Mt clay and CHCl₃ solvent using anhydrous ferric chloride (FeCl₃) at ambient temperature for 24 h in the presence of anionic surfactant SDS at a ratio by mass of 20 % of TP/TiO₂-Mt. The TiO₂-Mt was obtained by the modification of sodium montmorillonite (Na-Mt) with titanium isopropoxide (Ti (OPrⁱ) ₄) at 50 ¡ãC for 3 h. The products obtained were characterized using different techniques, such as Fourier Transform Infrared Spectroscopy (FTIR), X-ray Fluorescence Analysis (XRF), X-ray diffraction (XRD), and Environmental Scanning Electron Microscopy (ESEM), which proved the successful intercalation of polythiophene in the TiO₂-MT in the presence of anionic surfactants. The degradation of rhodamine 6G (R6G) in aqueous solutions was investigated kinetically in the presence of catalysts under Sun-test simulator at 400 W/m², sonocatalysis at 500 kHz (30 W), and sonophotocatalysis. The findings revealed that the TiO₂-Mt/PTP20 % -SDS catalyst exhibited good levels of photocatalytic, sonocatalytic, and sonophotocatalytic degradability for R6G. The synergistic effect between the two techniques was observed using TiO₂-Mt/PTP20 % -SDS (w % ) as a catalyst, and the kinetic results indicated that enhanced degradation rate constants were achieved particularly with sonophotocatalytic processes.