Preparation and Characterization of Mn0.4Zn0.6Fe2O4 Nanoparticles Supported on Dead Cells of Yarrowia lipolytica as a Novel and Efficient Adsorbent/Biosorbent Composite for the Removal of Azo Food Dyes: Central Composite Design Optimization Study
journal contributionposted on 20.02.2018, 00:00 by Arash Asfaram, Mehrorang Ghaedi, Kheibar Dashtian, Gholam Reza Ghezelbash
The removal of hazardous dyes is of great importance to making healthy and drinkable water. Here, a new ferromagnetic composite based on Mn0.4Zn0.6Fe2O4 nanoparticles (NPs) supported on dead Yarrowia lipolytica ISF7 (D-YL-ISF7) was prepared. Nanoparticle aggregation was inhibited using D-YL-ISF7, which causes the availability of more active sites. The dead D-YL-ISF7-supported Mn0.4Zn0.6Fe2O4 nanoparticles (NPs) were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), energy dispersive X-ray (EDX), Brunuaer–Emmett–Teller (BET), and vibrating sample magnetometer (VSM) analysis and used as robust adsorbents/biosorbents to simultaneously remove tartrazine (TA) and ponceau 4R (P4R) azo food dyes in their binary solution. First-order derivative spectrophotometry was implemented for the simultaneous analysis of dyes in binary mixtures. Central composite design (CCD) was used to evaluate the influence of pH, sonication time, Mn0.4Zn0.6Fe2O4-NPs-D-YL-ISF7 mass, and initial TA and P4R concentrations on the efficiency for the removal of the studied dyes. At optimum conditions (pH 2.0, sonication time 5 min, Mn0.4Zn0.6Fe2O4-NPs-D-YL-ISF7 mass 0.015 g, TA concentration 12 mg L–1 and P4R concentration 16 mg L–1), high removal efficiencies (>99.0%) were obtained for TA and P4R dyes, reasonably well predicted by the model. The CCD allowed the optimization and the scale-up of the process, which presented a good correlation between large and small scales. Adsorption isotherm data fitted well to the Langmuir model. Under ultrasound, the Langmuir adsorption capacity of Mn0.4Zn0.6Fe2O4-NPs-D-YL-ISF7 was obtained to be 90.827 mg g–1 for TA and 101.461 mg g–1 for P4R. A pseudo-second-order reaction model was chosen for kinetic study.
Read the peer-reviewed publication
ponceau 4 RNanoparticle aggregationHRTEMCCDremovalsample magnetometerFT-IRAdsorption isotherm dataMn 0.4 Zn 0.6 Fe 2 O 4 Nanoparticlespseudo-second-order reaction modelray diffractionBETDead CellsNPs-D-YL-ISF 7Langmuir adsorption capacityP 4R dyesXRDD-YL-ISF 7-supported Mn 0.4 Zn 0.6 Fe 2 O 4 nanoparticlesP 4R concentrationsNPs-D-YL-ISF 7 massMn 0.4 Zn 0.6 Fe 2 O 4 nanoparticlesNPs-D-YL-ISF 7 mass 0.015 gCentral Composite Design Optimization StudyP 4R azo food dyessonication timeYarrowia lipolytica ISF 7FESEMtransmission electron microscopymgMn 0.4 Zn 0.6 Fe 2 O 4EDXP 4RAzo Food DyesTAYarrowia lipolyticaLangmuir modelVSM