Herein a new visible photocatalyst by TiO₂ and nanosized polyoxometalate-based inorganic–organic hybrid material, NaH₈[PDA]₃[PW₉Co₃O₃₇]·13H₂O (PDA = p-phenylenediamine) (PDA-Co₃W₉), were successfully synthesized by an new straight forward method. Prepared powder was characterized by, FT-IR, PL, XRD, UV–Vis, DRS, and FE-SEM techniques. The FE-SEM images of the nanocomposite showed spherical-like nanoparticles with the mean size particle of 20–30 nm. The resulting materials were evaluated in the photodegradation of dye, using different light illuminations. Under optimized conditions, 100% dye removal was obtained. Tauc plots showed different bandgaps for different PDA-Co₃W₉ weight percentages on TiO₂ (PDA-Co₃W₉/TiO₂). The amplified photodegradation properties would be owing to the synergetic effect of PDA, Co₃W₉ and TiO₂ as components. Optimization of conditions were studied by response surface methodology. Also, relationship between effective factors and electrochemical properties of photocatalyst was investigated by Mott-Schotcky, Nyqist, and Bode plots. V_fb, N_D, and lifetimes of photogenerated electron–hole separation were calculated and compared with each other according to the photoactivity of different kinds of the catalysts. Specific capacitance of the best photocatalyst was calculated. Mechanism of photodegradation and reusability of the catalyst were also investigated.

本文介绍了一种新型的可见光催化剂，它由TiO ₂和纳米级多金属氧酸盐基无机-有机杂化材料NaH ₈ [PDA] ₃ [PW ₉ Co ₃ O ₃₇ ]·13H ₂ O（PDA = 对苯二胺）（PDA-Co ₃ W ₉），是通过一种新的直接方法成功合成的。通过FT-IR，PL，XRD，UV-Vis，DRS和FE-SEM技术对制备的粉末进行了表征。纳米复合材料的FE-SEM图像显示球形平均粒径为20–30 nm的纳米颗粒。使用不同的光照在染料的光降解中评估所得材料。在优化的条件下，可获得100％的染料去除率。Tauc图显示在TiO ₂（PDA-Co ₃ W ₉ / TiO ₂）上，不同的PDA-Co ₃ W ₉重量百分比不同，带隙也不同。放大的光降解特性将归因于PDA Co ₃ W ₉的协同作用和TiO ₂作为组分。通过响应面方法研究了条件的优化。此外，通过Mott-Schotcky，Nyqist和Bode图研究了光催化剂的有效因子与电化学性能之间的关系。根据不同种类催化剂的光活度，计算并比较了V _fb，N _D和光生电子-空穴分离的寿命。计算出最佳光催化剂的比电容。还研究了催化剂的光降解机理和可重复使用性。