A New Application of Thermal Spray in Preparation of Metallic Membrane for Concentration of Glucose Solution
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M.E. Aalami-Aleagha, S.S. Madaeni, and P. Daraei (Submitted December 14, 2008; in revised form March 17, 2009) Wire arc spraying has recently been used for preparation of porous metallic membranes. This work focuses on characterization of the metallic membranes produced by this technique based on porosity, oxide content, and the pore size distribution. The effect of atomizer air pressure and stand-off distance on membrane properties is examined. According to the obtained results, stronger atomizer air pressure leads to a decrease in both porosity and oxide content, while a longer stand-off distance promotes the oxide content and only increases the porosity at the distances not longer than 30 cm. A prepared metallic layer was set up in an experimental membrane cell as a permselective film for filtration of glucose solution. Generally, the water flux was appropriate, and the prepared membranes was able to remove glucose from water efficiently.
Keywords
glucose, metallic membrane, porosity, thermal spraying, wire arc spraying
1. Introduction Thermal spray is commonly applied for depositing a protective layer over the surfaces of industrial components for increasing the resistance against corrosion, abrasive wear, and high thermal shock (Ref 1-4). Other applications also extend to production of dielectric capacitors, repairing existing parts, or even decorative arts. Recently, Kulkarni et al. (Ref 5) used this technique for producing an inorganic ceramic membrane as a catalyst in the conversion of methane into synthesis gas (i.e., a mixture of carbon monoxide and hydrogen). The ceramic membrane was produced by plasma spraying technique and used for gas separation process particularly at high temperature. Membrane is a porous or nonporous layer that is able to permeate materials selectively. Indeed, the layers produced by thermal spray technique are intrinsically porous. Hence, this technique can potentially be used to produce porous metallic and ceramic membranes. Purification and enrichment of chemicals (raw materials and/or products) is an important part of the chemical process. Therefore, the separation process is very critical
M.E. Aalami-Aleagha, Department of Mechanical Engineering, Razi University, Kermanshah, Iran; and S.S. Madaeni and P. Daraei, Department of Chemical Engineering, Membrane Research Center, Razi University, Kermanshah, Iran. Contact e-mail: [email protected].
Journal of Thermal Spray Technology
in chemical and petrochemical industries. The common methods for separation such as liquid-liquid extraction and distillation consume large amount of energy. ‘‘Membranes’’ have been used and developed in order to save energy and cost. The nonmetallic membrane is applied for water desalination and food processing and in some cases emerges as a unique separation process in pharmaceuticals (Ref 6). Leiknes et al. (Ref 7) have investigated the feasibility and potential of using inorganic metal microfiltration membranes with coagulation pretreatment for producing potable water. The metal membran
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