Mg-doped TiO2mesoporous nanomaterial with high-efficiency solar photoelectric conversion was successfully prepared by a solid-state reaction using cetyltrimethyl ammonium bromide as a template agent. As-prepared Mg-TiO2nanomaterials are characterized with XRD、SEM, UV-Vis, XPS, BET and Raman spectroscopy. It was found that magnesium as Mg2+incorporates into the framework of TiO2by isomorphous replacement with content of 2.36%. The Mg-TiO2nanoparticles are anatase phase with particle size of 10-24nm. The rod-like nanoparticles have specific surface area of 104.5m2/g and pore-diameter distribution centre of 5.1 nm. The surface of Mg-TiO2material with stretching vibrational peak at 1105cm−1is assignable to the Mg-O-Ti bond. Furthermore, the UV–vis displays that the absorption region of mesoporous Mg-TiO2powder shifts to 405nm, and the absorption intensity of the visible-light region is enhancement. At 20oC, pH = 6.8,c0= 50 mg/L, within 150 min, the rule of pseudo-second-order reaction and the degradation rate of thiophanate methyl of 57% and 91.8% corresponding visible-light irradiation and ultraviolet irradiation are obtained for the Mg-TiO2nanomaterial. But it is poor to photodegradation of thiophanate methyl for P25-TiO2, and it keeps to the rule of pseudo-first-order reaction.

With tetrabutyl orthotitanate, hydrazine hydrate and aluminum chloride hexahydrate as original materials and pyridine as a template reagent, N/Al doped TiO2 (N-TiO2, Al-TiO2, Al-N-TiO2) mesoporous nanomaterials were successfully synthesized through a simple and environmentally friendly solid state reaction route. The textural properties of the samples were characterized by X-ray diffraction (XRD), high resolution transmission electron microscope (HRTEM), ultraviolet visible light spectroscopy (UV-Vis), X-ray photoelectron spectroscopy (XPS), Raman spectroscope and N2 adsorption-desorption at 77K. Moreover, the formation mechanism of the N/Al-doped TiO2 mesoporous material was proposed in presence of pyridine. It clearly shows that the microscopic structure of Al-N-TiO2 nanomaterial with crystal anatase phase is an irregular shape nanoparticle with size of 5~20 nm. N atoms as N3- states have been incorporated into the lattice of TiO2 or have been entered into the interstice of TiO2 lattice. Al ions occupy the sites of Ti in crystal lattices by isomorphous replacement. Either the doping of N or Al, or the co-doping of N and Al, it can effectively embarrass the crystal growth of TiO2. The specific surface area and the average pore diameter are the 138.4 m2/g and 1.9 nm, respectively. Interestingly, the UV-vis spectra display that the adsorption intensity of N-Al-TiO2 nanomaterial decreases in the order of N-Al-TiO2＞N-TiO2＞Al-TiO2.

Al and S co-doped TiO2 (S-Al-TiO2) mesoporous materials as a kind of visible light photo- catalysts are prepared using pyridine as a template through a solid state reaction route. The materials features are characterized by the advanced instruments. The photodegradation kinetic of paclobutra- zol is investigated. It is shown that the doping of S and Al could effectively inhibit the growth of anatase TiO2, both S and Al have entered into the lattice of TiO2. Surface area of 81.3m2/g and narrow pore size distribution (~2.1nm) are presented, it not only enables the visible-light absorption but also promotes photocatalytic property of paclobutrazol. Moreover, within 150 min of visible-light irradiation, the photocatalytic degradation of paclobutrazol approximately follows an order kinetics, and the photodegradation rate in 46.7% and reaction rate constant of 0.00414 min-1 are obtained.

Today, nanoparticles have attracted the attention of many researchers due to their special properties as well as their many technological applications. Among these, titanium dioxide nanoparticles have many important applications in various industries due to their excellent optical, electrical and catalytic properties. These applications include use in industrial pigments, as photocatalysts in environmental cleansing, in sunscreens to protect the skin, in photovoltaic applications for solar cells, sensors, in electronic device components, and many more. Two important properties of this material that make it very efficient and useful in life are its photocatalytic and superhydrophobic properties. These two properties are used to purify water and wastewater, eliminate air pollution and buildings, accelerate photochemical reactions such as hydrogen production, fabricate surfaces and layers and self-cleaning glass. The properties of titanium dioxide nanoparticles are strongly dependent on the size of the doped particles, elements or compounds and the surface modifications made on them, which in turn are influenced by the nanoparticle synthesis method. For this reason, methods for the synthesis of titanium dioxide nanoparticles have received much attention today. As the size of the material gets smaller and smaller and reaches the nanoscale, new physical and chemical properties show up. Among the unique properties of nanomaterials, the motion of electrons and holes in semiconductor nanomaterials is dominated by quantum constraint, and the transfer properties of phonons and photons are strongly influenced by the size and geometry of the material. The effective surface area and surface to volume ratio increase with decreasing the material size. High effective levels are achieved by small particles, which will be useful in many 2TiO-based types of equipment in which the interaction of the common surface of the material is important.