In the present research work, a novel and green TiO2 as an excellent photocatalyst has been synthesized and a comparative study of its structural, morphological and optical properties has been carried out with that of chemical synthesized. Green TiO₂ has been synthesized using Titanium(IV)-iso-propoxide as a precursor and Lagenaria siceraria leaf extract has been used as a reducing and capping agent. Photocatalytic activity results indicate that TiO₂ nanoparticles synthesized by green method exhibit excellent percentage removal (98.88%) of RG-19 dye in acidic medium as compared to chemical synthesized TiO₂ sample which exhibits only 88.55% removal of dye. Higher apparent rate constant (0.02802 min⁻¹) of photocatalytic reaction for green synthesized TiO₂ nanoparticles as compared to that of chemical synthesized with apparent rate constant (0.0154 min⁻¹), leads to the lower incubation time i.e., 60 min for green synthesized and 120 min for chemical synthesized. TiO₂ nanoparticles synthesized via green synthesis offer high and fast removal of RG-19 dye as compared to chemical route. This study explores the green chemistry based TiO₂ as an efficient photocatalyst with outstanding photocatalytic performance, which may open a new perspective for the preparation of excellent photocatalyst with cost-effective and environmentally friendly alternative to chemical and physical methods.

在本研究工作中，已经合成了一种新型的绿色TiO2作为优良的光催化剂，并且已经对其结构，形态和光学性质与化学合成方法进行了比较研究。已使用异丙醇钛（IV）作为前体合成了绿色TiO _2，并且将剑兰（Lagenaria siceraria）叶提取物用作还原剂和加帽剂。光催化活性结果表明，与化学合成的TiO ₂样品仅显示88.55％的染料去除率相比，通过绿色方法合成的TiO ₂纳米颗粒在酸性介质中表现出优异的RG-19染料去除率（98.88％）。较高的表观速率常数（0.02802 min ^-1）与表观速率常数（0.0154 min ^-1）的化学合成的光相比，绿色合成的TiO ₂纳米粒子的光催化反应的孵育时间更短，即绿色合成的孵育时间为60分钟，化学合成的孵育时间为120分钟。与化学途径相比，通过绿色合成法合成的TiO ₂纳米颗粒可快速高效地去除RG-19染料。这项研究探索了基于绿色化学的TiO ₂作为具有出色光催化性能的高效光催化剂，这可能为制备具有成本效益和环境友好的化学和物理方法的优良光催化剂开辟新的前景。