5 g of the prepared titanium dioxide react with suitable acid with molar ratio (3:1), add 100 m distilled water, the product neutralize with ammonia (2 M) until pH 11, stirring, and heating at 90 °C for 30 min, filter the mixture, wash by distilled water, drying at 105 °C for 2 h., calcination at 550 °C, the product named titanium dioxide nano particles (TiO2 NPs).
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