Photocatalytic Application And Modification On The Titanium-base Mesoporous Carbon

With the rapid development of industry, water pollution has become one of themost concerns of human. Elimination of toxic pollutants in water is one of theimportant researches in the field of chemical pollution control. Due to the stability ofdegradation of toxic pollutants, TiO₂is the most widespread photocatalytic materials.But TiO₂photocatalysts has many problems, such as:1. The loss of catalysts in thesolution;2. Aggregation of particles in suspension;3. Difficulty in application tocontinuous flow systems. In recent years, immobilized and doped are hot researchdirections.Carbon materials have large specific surface area, stability, and good electricalconductivity. These properties make it good immobilized materials. Therefore, thisthesis respectively from the ordered mesoporous carbon serves as the support todisperse and isolate anatase nanoparticles, and the non-metallic elements doped titaniacrystal lattice, specific content as follows:First chapter for the summary of the research background mainly introduced theresearch progress of the semiconductor photocatalyst and general research situation ofimmobilized and modified.The second chapter describes the interaction between carbon and titania in amesoporous carbon-titania composite is proved to improve the photodegradationperformance of dyes. Due to the C-TiO₂mesoporous structure in the photocatalyticstudies rarely reported. We through the understanding of mesoporous structure, designof a novel synergy adsorption-catalysis cycles, this method can effectively removehigh concentrations of toxic pollutants in water. The composite is synthesized by thesurfactant self-assembly. The material is not only efficient for toxic pollutant molecules adsorption, but also TiO₂in the material as a single anatase phase. Theseunique features make the composites exhibiting excellent photodegradation activity,which can efficiently adsorb contaminants from water by abundant mesopores andeliminate them by photocatalysis. Over80adsorption-catalysis cycles without distinctloss in photocatalytic activity and anatase content of the catalyst can be achieved.Of the third chapter, the research is ordered mesoporous carbon-based titania as ahighly efficient and reusable adsorbent-catalyst in decontaminating phenol from water.Through adsorption-catalysis cycles, phenol pollution （200mg/L） in aqueous can becompletely removed after10cycles. The resulting findings indicate the promisingapplications in environmental remediation especially in treating relatively highconcentration non-biodegradable organic substances by mesoporous photocatalyst.In the fourth chapter, the synthesis of mesoporous N, C codoped TiO₂@Cnanocomposites. Titanium tetrachloride as titanium source, phenolic resin as carbonsource, by adding the nitrogen source in the process of self-assembly synthesis, the Nand C elements can be doped in TiO₂crystal lattice. The synthetic process is simpleand effective and doesn’t need post-processing which is compound the concept ofgreen chemistry. By XRD, BET and FI-IR, the mesoporous structure of the compositeis very integrity. By XPS, diffuse reflectance UV–vis spectra, non-metallic element N andC elements are codoped in the TiO₂lattice.