Synthesis Of Morphology Controlled Of Titanium Dioxide Composite Catalyst And Photocatalytic Performance Research

In this paper, be based on TiO2photocatalysts; constructed three different nanocomposites,namely CNTs-TiO2, CNTs-Ag@TiO2and CdS@TiO2, characterized of three nanocomposites bymeans of characterization methods. Rhodamine B (RhB) solution as the target degradation matter,photocatalytic degradation experiments was under visible light, aim to determine thephotocatalytic properties of three nanocomposites. The main contents are as follows:(1) Used the sol-gel solvothermal method to load TiO2particles on the CNTs surface, to getthe CNTs-TiO2composites. By SEM, TEM and XRD can be observed with the increase of CNTscontent, TiO2on the surface of CNTs have better dispersion, and the smaller size of TiO2particles.Observed N2adsorption-desorption isotherms, know that the TiO2attached on CNTs surface weremesoporous. UV-vis absorption spectrum result show that, CNTs-TiO2having excellent lightabsorption in the visible region, with the increase of the content of CNTs, the composites forvisible light absorption properties was enhance. The experiment of photocatalytic degradationRhB shows the CNTs-TiO2(20wt%) has best effect in photocatalytic degradation of RhB undervisible light.(2) Through the polyol method prepared monodisperse Ag nanoparticle, and then loadingTiO2particles on Ag nanoparticle surface via a solvothermal method, forming a uniform TiO2shell, to obtain the Ag@TiO2core-shell materials and use the impregnation method to introducedCNTs into the core-shell system, formation of CNTs-Ag@TiO2nanocomposites. By SEM, TEM,EDX and XPS, tested the morphology and structure of Ag@TiO2core-shell nanostructure.Through the UV-vis absorption spectra, that CNTs-Ag@TiO2has absorbed almost the entiremeasurement range. In photocatalytic degradation RhB experiments, during50min under visiblelight irradiation, CNTs-Ag@TiO2nanocomposites was almost completely degraded RhB solution,compared to TiO2andAg@TiO2core-shell particles, its photocatalytic have increased.(3) Based Oswald ripening effect, hydrothermal been prepared CdS spherical nanoparticles,the particles have smooth surface and well dispersion, diameter probably in between400-600nm.Using high temperature solvothermal method coated TiO2shell on the surface of CdS particles,constitutes CdS@TiO2core-shell nanoparticles. From the TEM images, the CdS@TiO2core-shellstructure can be clearly observed, and analysis it’s composed of elements through EDX and XPS.Compare the UV-vis analysis spectra, CdS@TiO2core-shell nanoparticle can extend absorb lightresponse range of TiO2to the visible light region. In photocatalytic degradation RhB experiment,compared to pure TiO2particles, CdS@TiO2core-shell nanoparticles show better photocatalyticproperties.