Synthesis of CTAB intercalated graphene and its application for the adsorption of AR265 and AO7 dyes from water

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• 作者：Mohammed Yusuf^a ; ^b ; Moonis Ali Khan^c ; ^{mokhan@ksu.edu.sa} ; ^{moonisalikhan@gmail.com} ; Marta Otero^d ; E.C. Abdullah^a ; Masaaki Hosomi^b ; Akihiko Terada^b ; Shohei Riya^b
• 关键词：Graphene ; Cetyltrimethylammonium bromide ; Acid red 265 ; Acid orange 7 ; Batch and column operations
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 May 2017
• 年：2017
• 卷：493
• 期：Complete
• 页码：51-61
• 全文大小：1742 K
• 卷排序：493

文摘

Environmental applications of graphene (GN) are limited by the occurrence of aggregation. Herein, graphene oxide (GO) was synthesized, reduced to GN by ascorbic acid, and intercalated with cetyltrimethylammonium bromide (CTAB). GN-CTAB was characterized by Boehm’s titration, N2 adsorption/desorption, Fourier transform infrared spectroscopy, Raman spectroscopy, Fluorescence spectrophotometry, X-ray diffraction and Scanning electron microscopy. Then, GN-CTAB was used for the adsorptive removal of acid red 265 (AR265) and acid orange 7 (AO7) dyes from water both under batch and column operation. Under batch operation, the effect of pH, adsorbent dosage, initial dye concentration, contact time and temperature on dyes adsorption were assessed. Adsorption isotherms, kinetics, and thermodynamics were analyzed systematically. Regarding the fixed bed operation, the effect of both the bed height and flow rate were studied and experimental results fitted to the Thomas and BDST models. Then, the bed loss capacity along five adsorption-regeneration cycles was determined in order to further approach the practical application of GN-CTAB for wastewater treatment, namely for the removal of dyes.