Studies from Dalian University of Technology Update Current Data on Chemical Engineering (Microspheroidization treatment of macroporous TiO2 to enhance its recycling and prevent membrane fouling of photocatalysis-membrane system)
By a News Reporter-Staff News Editor at Journal of Engineering -- Investigators publish new report on Chemical Engineering. According to news reporting originating in Dalian, People's Republic of China, by VerticalNews journalists, research stated, "Patterned porous (PP)-TiO2/calcium-alginate (CA) microspheres with an average diameter of 3 mm were prepared by immobilizing PP-TiO2 into CA balls to improve their recycling and photoactivity. The microspheres demonstrate higher degradation activity on methylene blue (MB) than Degussa P-25 nanoparticle/CA (P25-TiO2/CA) spheres, freely suspended PP-TiO2, and P25-TiO2 fine particles."
The news reporters obtained a quote from the research from the Dalian University of Technology, "Furthermore, the microspheres can be easily recycled. Meanwhile, the energy cost in the recycling of PP-TiO2 is 1.23 x 108 J per gram PP-TiO2. The PP-TiO2/CA microsphere combined polyacrylonitrile (PAN) microfiltration membrane system was established to dispose of the MB wastewater. Compared with the PP-TiO2 catalyst-membrane system, the PP-TiO2/CA microsphere-membrane system can achieve almost 90% degradation ratio of MB. The permeation flux for the combined system is approximately the same as that of the PAN membrane and remains at 90 L/m(2) h. However, the permeation flux decreases to 70 L/m2 h when freely suspended PP-TiO2 is used as photocatalyst. The reason is that with the operation going on, the PP-TiO2 cake layer is formed by a growing number of suspended PP-TiO2 particles depositing on the membrane surface. The deposition induces membrane fouling and inhibits the photocatalysis activity of PP-TiO2 in the solution, whereas PP-TiO2/CA microspheres remain suspended in the solution under gentle stirring. Moreover, the sum of drag force F-D and buoyancy F-b (F-D + F-b = 1.552 x 10(-4) N) imposed on the microsphere was calculated to be comparable with the gravity G (1.566 x 10(-4) N) of the PP-TiO2/CA microsphere. This result further reveals that the microspheres are suspended in the dye solution, thereby preventing membrane fouling."
According to the news reporters, the research concluded: "We believe that the microspheroidization of PP-TiO2 and the combined microsphere-membrane system provide a new idea for practical wastewater treatment."
For more information on this research see: Microspheroidization treatment of macroporous TiO2 to enhance its recycling and prevent membrane fouling of photocatalysis-membrane system. Chemical Engineering Journal, 2014;251():58-68. Chemical Engineering Journal can be contacted at: Elsevier Science Sa, PO Box 564, 1001 Lausanne, Switzerland. (Elsevier - www.elsevier.com; Chemical Engineering Journal - www.elsevier.com/wps/product/cws_home/601273)
Our news correspondents report that additional information may be obtained by contacting X.C. Li, Dalian University of Technology, Sch Chem Engn, R&D Center Membrane Sci & Technol, State Key Lab Fine Chem, Dalian 116024, People's Republic of China. Additional authors for this research include X.M. Wu, G.H. He, J.S. Sun, W. Xiao and Y. Tan.
Keywords for this news article include: Asia, Dalian, Chemical Engineering, People's Republic of China
Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC