title: Screening and optimization of highly effective ultrasound-assisted simultaneous adsorption of cationic dyes onto Mn-doped Fe3O4-nanoparticle-loaded activated carbon.
abstract: The ultrasound-assisted simultaneous adsorption of brilliant green (BG) and malachite green (MG) onto Mn-doped Fe3O4nanoparticle-loaded activated carbon (Mn-Fe3O4-NP-AC) as a novel adsorbent was investigated and analyzed using first derivative spectrophotometry. The adsorbent was characterized using FT-IR, FE-SEM, EDX and XRD. Plackett-Burman design was applied to reduce the total number of experiments and to optimize the ultrasound-assisted simultaneous adsorption procedure, where pH, adsorbent mass and sonication time (among six tested variables) were identified as the most significant factors. The effects of significant variables were further evaluated by a central composite design under response surface methodology. The significance of independent variables and their interactions was investigated by means of the analysis of variance (ANOVA) within 95% confidence level together with Pareto chart. Using this statistical tool, the optimized ultrasound-assisted simultaneous removal of basic dyes was obtained at 7.0, 0.02g, 3min for pH, adsorbent mass, and ultrasonication time, respectively. The maximum values of BG and MG uptake under these experimental conditions were found to be 99.50 and 99.00%, respectively. The adsorption process was found to be followed by the Langmuir isotherm and pseudo-second order model using equilibrium and kinetic studies, respectively. According to Langmuir isotherm model, the maximum adsorption capacities of the adsorbent were obtained to be 101.215 and 87.566mgg-1for MG and BG, respectively. The value of apparent energy of adsorption obtained from non-linear Dubinin-Radushkevich model (4.348 and 4.337kJmol-1for MG and BG, respectively) suggested the physical adsorption of the dyes. The studies on the well regenerability of the adsorbent in addition to its high adsorption capacity make it promising for such adsorption applications.
authors: Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran.
authors: Arash
authors: A
authors: Asfaram
authors: Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran. Electronic address: m_ghaedi@mail.yu.ac.ir.
authors: Mehrorang
authors: M
authors: Ghaedi
authors: Department of Physics, Yasouj University, Yasouj 75918-74831, Iran; Department of Semiconductors, Materials and Energy Research Center, Karaj 3177983634, Iran.
authors: Shaaker
authors: S
authors: Hajati
authors: Department of Polymer Engineering, Golestan University, Gorgan 49188-88369, Iran.
authors: Alireza
authors: A
authors: Goudarzi
authors: Chemistry Department, Yasouj University, Yasouj 75918-74831, Iran.
authors: Ebrahim Alipanahpour
authors: EA
authors: Dil
mesh_terms: D000327:Adsorption; D000704:Analysis of Variance; D002606:Charcoal / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry* / Q000302:isolation & purification; D058185:Magnetite Nanoparticles / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry* / Q000302:isolation & purification; D012394:Rosaniline Dyes / Q000737:chemistry* / Q000302:isolation & purification; D013997:Time Factors; D000069453:Ultrasonic Waves; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification; D018508:Water Purification
chemical_list: D004396:Coloring Agents; D058185:Magnetite Nanoparticles; D000644:Quaternary Ammonium Compounds; D012394:Rosaniline Dyes; D014874:Water Pollutants, Chemical; C005095:malachite green; D002606:Charcoal; D008345:Manganese; C006798:brilliant green
keywords: Basic dyes removal; Derivative spectrophotometry; Experimental design; Isotherms and kinetic studies; Mn-Fe(3)O(4)-NPs-AC; Ultrasound-assisted simultaneous adsorption