Preparation And Photocatalytic Properties Of Novel Ti-based Oxide Nanomaterials

Photocatalytic technology is the use photon energy by the semiconductor catalyst, makes the chemical reactions that occur in many harsh conditions turn into reaction under mild ambient conditions. The technology plays a unique role in the areas of energy and environmental protection for its environmentally friendly features. Its rise not only opened up a new way for the energy crisis, but also contributed to a green environment. However, as an emerging technology, photocatalytic technology, there are some shortcomings. Aiming low photocatalytic efficiency, response interval and narrow issue, we synthesis of Ti O2 nanosheets of 2D structures and doped strontium titanate(STO) of nanomaterials in order to comprehensively improve the photocatalytic activity of existing photocatalysts.For the problem of single-phase Ti O2 photo-generated electron-hole recombination rate, we first used graphene oxide as a sacrificial template by Sol – Gel method to synthesis the new mixed phase titania nanosheets, to improve its photocatalytic hydrogen production performance. The SEM, TEM and AFM images revealed that the thickness of mix-phase Ti O2 nanosheets was ca. 66 nm, and the TiO2 nanosheets were in a polycrystalline phase and made up of nanoparticles with the diameters of 15-25 nm. In addition, we observed that the proportion of rutile and anatase changed with the amount of tetrabutyltitanate(TBT). The results showed that the sample with 4 m L tetrabutyltitanate(TBT-4) exhibited the highest hydrogen production rate(339 μmol / h) in all samples, which was 47% higher than the bulk sample.For strontium problem of titanate(STO) Only respond of ultraviolet light and consuming hydrothermal synthesis method, this paper step by microwave-assisted hydrothermal synthesis of La-Cr co-doped strontium titanate(STO) nanoparticles. The results showed that the microwave method can be synthesized La-Cr visible light responsive total strontium titanate(STO) doped nanomaterials in a very short time. Investigate the effect of doping on the photocatalytic hydrogen production performance of STO, the results show, La, Cr doping ions doped photocatalytic properties will have an impact on STO. Final results showed that when the amount of doped La-Cr 5% of the total molar amount of time, the best performance of its photocatalytic hydrogen production.For strontium titanate(STO) wide band gap, a narrow range of light response, this paper makes STO band gap narrowing by Cr doping method, so that Cr doped STO get visible degrade the ability of tetracycline. Investigate doping photocatalystic tetracycline efficiency, results show that doping in 0.5% to 2%, Cr-doped STO photocatalytic activity increases with the mass ratio of Cr / Sr increases, while When the doping amount exceeds this range, the photocatalytic activity with increasing doping amount decreases. Finally, to explore the degradation mechanism of Cr doping STO photocatalyst electron spin resonance(ESR) techniques and radical trapping experiments, the results show that hydroxyl radicals and holes play an important role in the degradation of tetracycline.