کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
625426 1455428 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Modified maghemite nanoparticles as an efficient adsorbent for removing some cationic dyes from aqueous solution
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Modified maghemite nanoparticles as an efficient adsorbent for removing some cationic dyes from aqueous solution
چکیده انگلیسی

A novel adsorbent, sodium dodecyl sulfate (SDS) modified maghemite nanoparticles (SDS–γ-Fe2O3), was used for removal of cationic dyes brilliant cresyl blue (BCB), thionine (Th) and janus green b (JG), from water samples. Prepared nanoparticles were characterized by TEM, SEM, XRD, BET and EDX measurements. The influences including initial pH, dosage of adsorbent, surfactant amount and contact time have been researched in order to find the optimum adsorption conditions. The experimental data were analyzed by the Langmuir and Freundlich adsorption models. Equilibrium data fitted very well with the Langmuir model signifying the energetic homogeneity of SDS-maghemite surface adsorption sites. The maximum predicted adsorption capacities for Th, BCB and JG dyes were obtained as 200.0, 166.7 and 172.4 mg g− 1, respectively. It was shown that the sorbent can remove more than 93% of the investigated dyes within the first 4 min of contact time. The desorption process of the adsorbed cationic dyes was also investigated using methanol and methanol–acetic acid mixture as the solvent. It was notable that both the adsorption and desorption of dyes were quite fast probably due to the absence of internal diffusion resistance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 263, Issues 1–3, 30 November 2010, Pages 240–248
نویسندگان
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