The Effects of Nanometer Titanium Dioxide on Tumor Cells and in Rats with Nasopharyngeal Carcinoma

A drug delivery system based on nanomaterials has demonstrated a powerful function in disease treatment. In this study, a titanium-dioxide-nanotube-based cisplatin (nano-TiO2-DDP) delivery system was designed, and its effects in rats with nasopharyngeal carcinoma (NPC) and on tumor cells were analyzed. First, we obtained electrochemistry anodic oxidation (EAO) for the preparation of Nnano-TiO2, which was adopted as the carrier of cisplatin (CDDP). Then, we used a scanning electron microscope (SEM) to characterize and study the surface morphology of nano-TiO2. At the cellular level, flow cytometry, MTT, and Transwell assays were performed to analyze the apoptosis, proliferation, and invasion of cells treated by nano-TiO2-DDP, respectively. At the animal level, a xenotransplantation model was established for evaluating tumor growth and changes in experimental animals after injection of nano-TiO2-DDP. As a result, nano-TiO2-DDP strongly suppressed the invasion and vitality of tumor cells, induced their apoptosis, and delivered DDP more efficiently than did systems without a nano-TiO2 structure. In addition, injected nano-TiO2-DDP strongly inhibited the growth of solid tumors in vivo. Therefore, we believe that nano-TiO2-DDP can effectively suppress the growth of NPC, and it is more efficient than conventional drugs.

Nanometer Titanium Dioxide Mediated High Efficiency Photodegradation of Fluazifop-p-Butyl

The widespread use of fluazifop-p-butyl (FPB) contributes to its presence in the environment. Considering the ecological risks of FPB residues in the environment, the anatase nanometer titanium dioxide (nano-TiO2) mediated photocatalytic degradation of FPB was studied by smearing FPB and nano-TiO2 together on a glass plane; illumination, trimethylsilane derivatization of photolysis products, high performance liquid chromatography (HPLC) quantitative analysis and gas chromatograph-mass spectrometer (GC-MS) identification were used. Results showed that the first order dynamic model could describe the photodegradation of FPB by nano-TiO2 mediated, and the photodegradation and photosensitization rates were found to be positively correlated with the dose of nano-TiO2 at lower dose ranges. It is noticeable that a strong photosensitization effect was exhibited on degradation of FPB, not only under high-pressure mercury lamps, but also simulated sunlight (xenon lamp light). Ultimately, twelve main photolytic products were reasonably speculated, whilst five photolysis pathways were proposed. These results together suggest that nano-TiO2 can be used as an effective photosensitizer to accelerate FPB photolysis.

Preparation and Photocatalytic Properties of TiO2-Al2O3Composite Loaded Catalysts

This paper presents an experimental approach to study catalytic effects of Fe3+modified nanometer titanium dioxide (TiO2) loaded on aluminium oxide (Al2O3). Sol-gel method was used to prepare modified TiO2loaded on carrier. Purification tests were conducted in a self-developed instrument to study catalytic effects of TiO2loaded on Al2O3with different contents through degradation rate. The modification mechanism was studied by scanning electron microscope (SEM). Results showed that loading on Al2O3improved photocatalytic effect of TiO2modified with Fe3+. The best photocatalytic effect was achieved under catalytic action of Al2O3loaded with 10% TiO2composite; the degradation rates were 6.9%, 13.8%, 21.4%, and 49.2%, respectively, 0.7%, 3.9%, 1.3%, and 15.1% larger than unloaded TiO2. SEM results of four catalysts showed that nanometer TiO2was coated in form of grain on the surface of Al2O3. The optimal loading content was 10% at which the nanometer TiO2grains were coated on the surface of Al2O3uniformly.

Research on Concrete Photochemical Catalysis for NOx Abatement

As automobile amount increasing, the atmosphere pollution for the automobile emission becomes very serious. In the paper, we have studied vehicle emissions of decontamination by using nanometer titanium dioxide of photocatalysis method in traffic environment. In the study phases, The test result indicated that degradation effect of nanometer titanium dioxide in road surface was well. It may be used in road traffic to protection environment.

Study on Synthesis of In Situ Composite of Nano-TiO2 and Vinyl Acetate-Acrylate Emulsion

Nanometer titanium dioxide has not only small size effect, quantum dimension effect, surface and interface effects and macroscopic quantum tunnel effect, but also photocatalytic effect. Vac-acrylate emulsion is one of the important emulsion adhesive. It has good properties for coating, high cohesive strength, no pollution. It has the special functions with few nano-TiO2.In this paper, method of modification about nanometer TiO2was introduced via cellulose sodium. The modified nanometer titanium dioxide was added to the material of the preparation of acrylic emulsion including vinyl acetate, butyl acrylate, acrylic acid and methyl methacrylate to synthesize composite of nano-TiO2/vac-acrylic emulsion. According to the performance analysis of solid content of emulsion and stabilization, we can find that when the use level of dosage, emulsifier, nano-TiO2is 0.5%, 3.2%, 0.7%, and emulsion has the best combination property.

Research Progress of Nanometer Titanium Dioxide Application

nanoTiO2 has many excellent properties, showing increasingly broad application prospects, the application of nanometer titanium dioxide research thus became one of the hot spot of research. Mainly in the field of chemical, water treatment field, environmental protection, electrode and nanoTiO2 solar cell areas, the application of the research were summarized, the shortage of the current in the research are pointed out, looks forward to the main research direction in the future.