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本文报道了一种简单通用的水杨酸前驱体路线合成钛酸盐微球的方法,水杨酸作为配体和结构导向剂诱导前驱体形成球形结构.利用水杨酸与乙酸镁和钛酸四丁酯的配位作用,进而通过溶剂热反应得到镁-钛-水杨酸前驱体微球,在空气下焙烧得到混相MgTiO3/MgTi2O5微球.由于其合适的能带位置和混相结,混相MgTiO3/MgTi2O5微球表现出了优异的光催化产氢性能,相比混相MgTiO3/MgTi2O5纳米粒子和纯相纳米粒子产氢性能分别高出2和4倍.同时,这种配位前驱体路线可以拓展合成多种二价金属钛酸盐微球,并用此方法成功制备了BaTiO3,ZnTiO3,CoTiO3,NiTiO3和CdTiO3微球.这种基于配位化学路线的合成方法对于钛酸盐(或钙钛矿、尖晶石等)等功能微球材料的低温制备具有较高的科学意义和应用价值.
In this paper, a simple and versatile method for the synthesis of titanate microspheres by salicylic acid precursor route was reported. Salicylic acid was used as a ligand and structure-directing agent to induce the formation of a spherical structure. The salicylic acid was mixed with magnesium acetate and titanic acid Tetrabutyl titanate, and then the magnesium-titanium-salicylic acid precursor microspheres were obtained by solvothermal reaction and were calcined in air to obtain mixed phase MgTiO3 / MgTi2O5 microspheres.Because of their proper band position and mixed phase, the mixed phase MgTiO3 / MgTi2O5 microspheres exhibit excellent photocatalytic hydrogen production performance, which is 2 and 4 times higher than that of mixed-phase MgTiO3 / MgTi2O5 nanoparticles and pure-phase nanoparticles, respectively.At the same time, this coordination precursor route can BaTiO3, ZnTiO3, CoTiO3, NiTiO3 and CdTiO3 microspheres have been successfully prepared by the synthesis of a variety of bivalent titanate titanate microspheres.This synthesis method based on the coordination chemistry route is more effective for titanate (or perovskite) , Spinel, etc.) and other functional microspheres prepared at low temperature has high scientific significance and application value.