Optimized ratios Zn:Ti (1:1) of ZnO–TiO₂ nanocomposites synthesized via the sol–gel method were annealed at; 500 °C, 600 °C, 700 °C, 800 °C and 900 °C. The structural, morphological thermal, optical and chemical changes provoked by thermal treatment at different temperatures were characterized by XRD, SEM/TEM, TGA, DRS and FTIR respectively. The effect of annealing temperature was studied by photocatalytic degradation of methylene blue dye in UV light. XRD revealed mixed phases with high crystallinity whereas SEM images had different particle morphologies for the samples annealed at different temperatures. The photodegradation reported the highest rate for samples annealed at 700 °C which was attributed to the ZnTiO₃ phase, increased crystallite growth and reduced band gap with annealing temperatures.

溶胶-凝胶法合成的ZnO-TiO ₂纳米复合材料的最佳Zn：Ti（1：1）比例在；500°C，600°C，700°C，800°C和900°C。通过X射线衍射，SEM / TEM，TGA，DRS和FTIR分别表征了在不同温度下热处理引起的结构，形貌的热，光学和化学变化。通过亚甲基蓝染料在紫外光下的光催化降解研究了退火温度的影响。XRD显示出具有高结晶度的混合相，而SEM图像对于在不同温度下退火的样品具有不同的颗粒形态。对于ZnTiO _3，在700°C下退火的样品的光降解速率最高。 相，随着退火温度的增加，晶粒的生长增加，带隙减小。