Abstract The effects of heating method and temperature on physical, structural and photocatalytic behaviors of TiO2 pellets prepared by conventional heating and hot isostatic pressing have been evaluated. The pellets of submicron TiO2 powders were heated to 600, 650, 700, 750 and 1000 °C using both processing methods in order to compare anatase to rutile phase transformation and densification behaviors. Bulk densities and porosities were calculated using the Archimedes method. XRD analysis were performed to calculate anatase/rutile ratios. Microstructures were characterized using SEM. Photocatalytic experiments have been performed under full spectrum irradiation. Degraded methylene blue samples were periodically monitored through UV–vis spectrophotometer to determine degradation kinetics. Anatase to rutile transformation is slightly faster and densification is better for lower temperatures for conventional heating, however HIPing gives better densification above 750 °C as it also retards rutile transformation. Mixed phase structures and HIPed samples showed the best photocatalytic performance which makes this method advantageous.

中文翻译：

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具有改进光催化性能的 HIPed TiO 2 致密颗粒

摘要 评价了加热方法和温度对常规加热和热等静压制备的TiO2 球团物理、结构和光催化行为的影响。使用两种加工方法将亚微米 TiO2 粉末颗粒加热至 600、650、700、750 和 1000 °C，以比较锐钛矿与金红石的相变和致密化行为。使用阿基米德方法计算体积密度和孔隙率。进行XRD分析以计算锐钛矿/金红石比率。使用SEM表征显微结构。在全光谱照射下进行了光催化实验。通过紫外可见分光光度计定期监测降解的亚甲基蓝样品以确定降解动力学。锐钛矿到金红石的转变速度稍快，并且对于常规加热而言，较低温度下的致密化效果更好，但是 HIPing 在 750 °C 以上提供更好的致密化，因为它也会延迟金红石转变。混合相结构和 HIPed 样品显示出最好的光催化性能，这使得该方法具有优势。