Preparation Of TiO₂ Films Catalyst Loaded By Glass Springs And Solar Photocatalytic Degradation Of Simulating Dyeing-Wastewater Excited By Doublr Solar Sources

In 21 century, a hard task, solving environmental and energy difficulties must befaced. Water pollution has already been the focus of social life interests, and the perfectmethod to solve energy depleton is effective utility of sun power. TiO₂ is one kind ofenvironment-friendly wastewater treatment technology, which can transform solarenergy into chemical energy and mineralize organic substances of wastewatercompletely. At present, because the solar sources which can stimulate thephotocatalytic responses are mainly limited in ultraviolet light area, the development touse solar sources effectively for photo catalysis will present broad prospects.In this article, the present pollution situation of dyeing-wastewater in our countrywas focused on. So preparation of TiO₂ films catalyst loaded by glass springs wasstudied, double light sources degradation device was designed and typical dyes weredegraded by that device.In this study, the TiO₂ sol-gel was prepared using titanium tetrabutyl as precursor.The TiO₂ films were loaded on the glass springs' surface by dip-coating method. Thestructure and surface morphology of TiO₂ films were investigated by SEM, UV-vis andAFM instruments. Typical dyes were degraded using double solar sources in thatdevice. The results showed as following:(1) Storage stability of TiO₂ sol-gel was perfect. TiO₂ sol-gel could be used toprepare loaded TiO₂ films.(2) Common coating method had flaws, so that method needed be improved. TiO₂films made by improved method were lubricous, uniform and transparent.(3) Particle size was approximately 50nm in diameter and thickness of coatedTiO₂ films was approximately 200nm.(4) Loaded quality by carriers increased with the films layers, but the optimallayers were 5.(5) Solar source and artificial source were combined into that degradation devicewith double light sources properly and sunlight could be used in that device, which presented excellent degradation effects and super industry potential.(6) There were many super merits in that double light sources degradationdevice. Many mutual flaws of both sources such as instability, secular variation ofsunlight and high cost of artificial source could be overcome. Moreover, thatdevice with single source presented good degradation effects.The research of solar photocatalytic degradation of typical dyes showed:(1) Glass springs carriers were better than glass beads carriers.(2) Degradation rate was influenced obviously by initial concentration, pH,flow velocity of representative dyes solution.(3) Solar source and ultraviolet light could both excited photocatalyticresponses and they could supply each other.(4) On metallic deposit base, the loaded films photocatalyst were compounded.That compounded catalyst represented high loaded hardness and catalytic activity.(5) Compounded treatments could reduce preparation cost of catalyst andrepresented wide development prospect.