Acid Orange 7 Dye Biosorption By Salvinia Natans Biomass

Textile industries are responsible for producing large amounts of highly contaminated effluents by several types of synthetic dyes, which are characterized by being toxic and reactive. Biosorption technique has been used as a promising treatment way to the pigments that do not adhere to the tissues fibers during dyeing process. Among the diversity of materials, macrophytes can act as biosorbents of conventional pollutants, heavy metals and organic compounds. Batch experiments were carried out for biosorption of Acid Orange 7 dye onto macrophyte Salvinia natans. Effects of initial dye pH, contact time and temperature were investigated. Chemical and morphological characteristics of the biosorbent were evaluated before and after biosorption process using methods such as Scanning Electron Microscopy (SEM) and Infrared Spectroscopy (FT-IR). Sorption kinetics was conducted and followed pseudo-second order kinetic model. Equilibrium data were well represented by Langmuir model. The Salvinia natans exhibited a maximum uptake of 60.3 mg of dye per gram of macrophyte. The results indicated that Salvinia natans is a promising lowcost technology bioadsorbent for the removal of waste dyes. Copyright © 2013, AIDIC Servizi S.r.l.3210511056Aksu, Z., Tezer, S., Biosorption of reactive dyes on the green alga chlorella vulgaris (2005) Process Biochem., 40, pp. 1347-1361Aravindhan, R., Rao, J.R., Nair, B.U., Removal of basic yellow dye from aqueous solution by sorption on green alga caulerpascal pelliformis (2007) J. Hazard. Mater., 142, pp. 68-76Argun, M.E., Dursun, S., Ozdemir, C., Karatas, M., Heavy metal adsorption by modified oak sawdust: Thermodynamics and kinetics (2007) J. Hazard. Mater, 141, pp. 77-85Hameed, B.H., Ahmad, A.L., Latiff, K.N.A., Adsorption of basic dye (methylene blue) onto activated carbon prepared from rattan sawdust (2007) Dyes Pigm, 75, pp. 143-149Kannan, K., Sundram, M.M., Kinetics and mechanism of removal of methylene blue by adsorption on various carbons - A comparative study (2001) Dyes Pigm, 51, pp. 25-40Kumar, K.V., Sivanesan, S., Ramamurthi, V., Adsorption of malachite green onto Pithophora sp., a fresh water algae: Equilibrium and kinetic modeling (2005) Process Biochem, 40, pp. 2865-2872Lima, L.K.S., Kleinübing, S.J., Silva, E.A., Silva, M.G.C., Removal of chromium from wastewater using macrophyte Lemna as biosorbent (2011) Chemical Engineering Transactions, 25, pp. 303-308Srinivasan, A., Viraraghavan, T., Decolorization of dye wastewaters by biosorbents: A review (2010) J. Environ. Manage., 91, pp. 1915-1929Vieira, M.G.A., Almeida Neto, A.F., Silva, M.G.C., Carneiro, C.N., Melo Filho, A.A., Influence of the system on adsorption of Pb(II) and Cu(II) by rice husks ash: Kinetic study (2011) Chemical Engineering Transactions, 24, pp. 1213-1218Won, S.W., Choi, S.B., Yun, Y.S., Interaction between protonated waste biomass of corynebacteriumg lutamicum and anionic dye reactive red 4 (2005) Colloids Surf. A., 262, pp. 175-18

Numerical simulation of external compressible flows using the immersed boundary method with virtual physical model

The objective of this study was to apply the Immersed Boundary Method with the Virtual Physical Model to study external compressible flows. The Immersed Boundary methods have been increasingly used to model flows with submerged objects, particularly when they are in movement or deformation. These methods use independent grids to represent the domain and the immersed bodies. The domain is represented by an Eulerian mesh, whereas the 2D immersed body is represented by a set of points, which is called Lagrangian mesh. The no-slip condition is enforced by the force field introduced into the momentum equation. Another advantage of this approach is that the drag and lift forces can be calculated directly by using the Lagrangian force field. In the Virtual Physical Model, the force is first obtained in the Lagrangian grid by using the conservation laws and then is distributed to the Eulerian grid. In the present work, a nonuniform Cartesian grid and a central finite volume scheme with second order accuracy were used in the spatial discretization of the Navier-Stokes equations. The Euler method was applied for time discretization. Subsonic flows were simulated over a circular profile with adiabatic walls for different Reynolds numbers. Supersonic shock wave reflection problems were also simulated. Relevant parameters such as drag and lift forces, Strouhal number and pressure distribution were compared with numerical and experimental results from literature. In addition, this study was carried out using OpenFOAM program, seeking to validate the methodology and the in-house CFD code developed in this work.Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016

Removal Of The Synthetic Dye Remazol Brilliant Blue R From Textile Industry Wastewaters By Biosorption On The Macrophyte Salvinia Natans

Batch experiments were carried out for biosorption of Remazol Brilliant Blue R dye onto the macrophyte Salvinia natans. Effects of parameters such as initial dye concentration, pH, biosorbent dosage, contact time and temperature were investigated. Chemical and morphological characteristics of the biosorbent were evaluated before and after the biosorption process using methods such as Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TA), Differential Scanning Calorimetry (DSC) and Infrared Spectroscopy (FT-IR). Sorption kinetics were conducted and followed a pseudo-second order kinetic model. Equilibrium data were well represented by the Langmuir model. Salvinia natans exhibited a maximum uptake of 61.9 mg.g-1. The Dubinin-Radushkevich model indicated that the adsorption takes place by a physical process. Thermodynamic parameters were estimated. The negative values of the Gibbs energy indicated the spontaneous nature of the adsorption. 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