Photocatalysis is one of the effective methods to treat wastewater and degrade pollutants. Titania (TiO₂) is usually chosen based on its superior properties and its high performance as reported in many publications. However, the properties of TiO₂ may be influenced by the synthesis method. In this work, several methods were applied to synthesize TiO₂, and its modified form (composite with graphene oxide) to explore the influence of synthesis method on its photocatalytic activity for the methyl orange and phenol degradation under UV light illumination. The results showed that the synthesis method significantly influences on the morphology, particle sizes and surface area of the catalysts as examined by SEM and BET techniques but did not differentiate crystal structure and crystallite dimensions of catalysts as seen by XRD measurement. TiO₂ catalyst synthesized by hydrothermal method using P123 template was almost anatase phase, possessed high surface area (110 m²/g) and exhibited highest activity for methyl orange and phenol degradation under UV light illumination. However, the addition of graphene oxide to the catalyst is not yet able to improve its activity under visible light. Compared with ZnO-graphene oxide photocatalyst (almost 100% phenol degraded after 275 min of the treatment), TiO₂-graphene oxide catalyst exhibited much less activity for methyl orange and phenol degradation under visible light irradiation.

光催化是处理废水和降解污染物的有效方法之一。通常根据许多出版物中报道的钛白粉（TiO ₂）的优越性能和高性能来选择钛白粉（TiO ₂）。但是，TiO ₂的性质可能会受到合成方法的影响。在这项工作中，采用了几种方法来合成TiO ₂以及其修饰形式（与氧化石墨烯复合），以探讨合成方法对其在紫外光下对甲基橙和苯酚降解的光催化活性的影响。结果表明，通过SEM和BET技术检测，该合成方法对催化剂的形态，粒径和表面积有显着影响，但通过XRD测量不能区分催化剂的晶体结构和微晶尺寸。采用P123模板水热法合成的TiO ₂催化剂几乎为锐钛矿相，表面积大（110 m ^2）。/ g），并且在紫外线照射下对甲基橙和苯酚的降解表现出最高的活性。然而，向催化剂中添加氧化石墨烯尚不能提高其在可见光下的活性。与ZnO-氧化石墨烯光催化剂（在275分钟的处理后几乎100％的苯酚降解）相比，TiO _2-氧化石墨烯催化剂在可见光照射下对甲基橙和苯酚的降解活性要低得多。