Abstract Cobalt and sodium molybdate Na4Co(MoO4)3 was synthesized using the solid state method. X-ray diffraction (XRD), IR and Raman spectroscopy confirmed a monoclinic structure of the prepared sample. The morphology of the obtained nanoparticles was analyzed using scanning electron microscopy (SEM). The Surface area was determined using the Brunauer Emmett Teller (BET) method. The photoluminescence (PL) spectrum exhibits an emission band located at 2.45 eV and a weak green emission associated with deep-level defects. The UV–vis spectroscopy shows that band gap energy (Eg) of the sample is about 3.12 eV. The photocatalytic performance evaluates by means of the degradation of Navy Blue 5R (C.I. Acid Blue 113) azo dye under solar irradiation. Na4Co(MoO4)3 shows good photocatalytic removal efficiency of azo dye. The removal of Navy Blue 5R solution reaches 90% after 210 min of reaction under solar light irradiation. The experiments reveal that the deterioration rate of this dye usually follows pseudo-first-order kinetics for photodegradation mechanisms and the mean kinetic constant values of the Navy Blue 5 R solution is equal to 7.60 × 10−3 min−1. These results indicate that the prepared Na4Co(MoO4)3 compound may be of interest to degrade other organic pollutants.

中文翻译：

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Na4Co(MoO4)3 光催化降解工业偶氮染料在太阳光下的效率

摘要 采用固态法合成了钴和钼酸钠Na4Co(MoO4)3。X 射线衍射 (XRD)、IR 和拉曼光谱证实了所制备样品的单斜结构。使用扫描电子显微镜（SEM）分析获得的纳米颗粒的形态。使用Brunauer Emmett Teller (BET)方法确定表面积。光致发光 (PL) 光谱显示出位于 2.45 eV 的发射带和与深能级缺陷相关的弱绿色发射。UV-vis 光谱显示样品的带隙能量 (Eg) 约为 3.12 eV。光催化性能通过海军蓝5R（CI酸性蓝113）偶氮染料在太阳辐射下的降解来评估。Na4Co(MoO4)3 对偶氮染料具有良好的光催化去除效率。在太阳光照射下反应210分钟后，海军蓝5R溶液的去除率达到90%。实验表明，该染料的劣化率通常遵循光降解机制的准一级动力学，海军蓝 5 R 溶液的平均动力学常数值等于 7.60 × 10-3 min-1。这些结果表明制备的 Na4Co(MoO4)3 化合物可能对降解其他有机污染物感兴趣。