Rutile TiO2 Production: Optimization of Microwave Calcination of Metatitanic Acid Using Response Surface Methodology

Abstract Rutile TiO 2 was prepared by microwave calcination of metatitanic acid. A quadratic regression model for the conversion to rutile TiO 2 was developed by response surface methodology (RSM), to investigate the effects of the calcination temperature, the calcination time, the sample mass, and their interactions on the conversion rates. Within the scope of the experiments, only the calcination temperature and time had significant effects on the rutile TiO 2 conversion. Under the optimized conditions (866 °C, 61 min, 58 g), the predicted rutile TiO 2 conversion was 99.91 %, approaching the actual conversion (99.44 %). Thus, the optimization by RSM of microwave calcination of metatitanic acid for the preparation of rutile TiO 2 is a feasible approach to achieving a more efficient TiO 2 production process.