NDLI: Response surface methodology approach for optimization of simultaneous dye and metal ion ultrasound-assisted adsorption onto Mn doped $Fe_{3}O_{4}-NPs$ loaded on AC: kinetic and isothermal studies

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Rajabi, Maryam Asfaram, Arash Goudarzi, Alireza Ghaedi, Mehrorang
Description	Author Affiliation: Asfaram A ( Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran. m_ghaedi@mail.yu.ac.ir m_ghaedi@yahoo.com.)
Abstract	In the present work, the usefulness of ultrasonic power as a dispersion and mixing tool to accelerate the adsorption of Safranin O (SO), methylene blue (MB), $Pb^{2+}$ ions and $Cr^{3+}$ ions onto the novel composite $Fe_{3}O_{4}-NPs-AC$ adsorbent was investigated. This new material was extensively characterized and analyzed by different techniques such as XRD, FESEM, Raman spectroscopy and FT-IR. Central composite design (CCD) based on designed runs revealed that adsorbent mass, sonication time, MB concentration, SO concentration, $Pb^{2+}$ ion and $Cr^{3+}$ ion concentration and some of their interactions have significant contributions to the target compounds removal percentages. A combination of response surface methodology and Design-Expert software was used to qualify and estimate the influence and magnitude of each terms contribution to the response. An optimization study using the following investigated increments of the effective variables, adsorbent mass (0.01–0.03 g), sonication time (2–6 min), initial dye concentration (5–25 mg $L^{−1}),$ and initial metal ion concentration (20–60 mg $L^{−1}),$ revealed that fixing the experimental variables at 0.025 g of $Mn–Fe_{3}O_{4}-NPs-AC,$ with a 3 min sonication time, and 20 mg $L^{−1}$ of MB, 10 mg $L^{−1}$ of SO, 38 mg $L^{−1}$ of $Pb^{2+}$ ions and 42 mg $L^{−1}$ of $Cr^{3+}$ ions at room temperature lead to the achievement of the best characteristics and performance. Conduction of 32 experiments according to the limitations of CCD and a subsequent analysis of variance (ANOVA) gave useful information about the significant and also approximate contributions of each term (main and interaction of variables) in an empirical equation for the expected response. The results indicate that the $R^{2}$ values are more than 0.988 and the adjusted $R^{2}$ values are in reasonable agreement with $R^{2}.$ Under the optimal conditions, the MB, SO, $Pb^{2+}$ ion and $Cr^{3+}$ ion removal efficiencies reached 99.54%, 98.87%, 80.25% and 99.54% after 3 min, while their equilibrium data with high performance can be represented by Langmuir isotherms and a pseudo second-order kinetic model. The maximum adsorption capacities for the single component system, 229.4 mg $g^{−1}$ for MB, 159.7 mg $g^{−1}$ for SO, 139.5 mg $g^{−1}$ for $Pb^{2+}$ ions and 267.4 mg $g^{−1}$ for $Cr^{3+}$ ions, support the high efficiency of $Mn–Fe_{3}O_{4}-NPs-AC$ as a new adsorbent.
ISSN	14779226
Issue Number	33
Volume Number	44
e-ISSN	13645447
Journal	Dalton Trans.
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-09-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chromium Isolation & Purification Coloring Agents Lead Magnetite Nanoparticles Chemistry Manganese Water Pollutants, Chemical Adsorption Kinetics Methylene Blue Phenazines Sonication Temperature Ultrasonics Water Purification Journal Article
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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