Decolorization of crystal violet using nano-sized novel fluorite structure Ga2Zr2-xWxO7 photocatalyst under visible light irradiation

Fluorite type Zr based oxides with the composition Ga2Zr2-xWxO7 (x=0, 0.05, 0.1 and 0.15) were prepared using the citrate technique. Appropriate characterizations for all prepared materials were carried out. XRD clarified that all the undoped and W doped Ga2Zr2O7 samples were crystallized in the cubic fluorite phase structure. The average particle size of the prepared samples was in the range (3-8 nm). The lowest band gap (1.7 eV) and the highest surface area (124.3 m2/g) were recorded for Ga2Zr0.85W0.15O7. The Photocatalytic impacts of the prepared systems were studied by removal of crystal violet dye (CV) employing visible illumination taking in consideration initial dye concentrations, duration of visible irradiation treatment, catalysts dose and the dopant concentration. The obtained results showed faster dye removal with the boost of the catalyst dosage. W doping shifted the absorption to the visible light range by decreasing the band gap from 4.95 eV for parent Ga2Zr2O7 to 1.7 eV ...采用柠檬酸盐法制备了组分为Ga₂Zr₂₋ₓWₓO₇（x取值为0、0.05、0.1和0.15）的萤石型锆基氧化物。对所有制备得到的材料进行了系统表征。X射线衍射（XRD）分析表明，所有未掺杂及钨掺杂的Ga₂Zr₂O₇样品均以立方萤石相结构结晶。所制备样品的平均粒径介于3~8 nm之间。Ga₂Zr₀.₈₅W₀.₁₅O₇展现出最低的禁带宽度（1.7 eV）与最高的比表面积（124.3 m²/g）。本研究以结晶紫染料（CV）为模型污染物，采用可见光辐照工艺，考察了初始染料浓度、可见光辐照时长、催化剂投加量与掺杂剂浓度对所制备体系光催化性能的影响。实验结果表明，随着催化剂投加量的提升，染料降解速率随之加快。钨掺杂通过将纯相Ga₂Zr₂O₇的禁带宽度从4.95 eV降至1.7 eV，使材料的光吸收范围红移至可见光区域……