The synthesis of Ta-doped ZnO nanomaterials (TZ) was carried out in this study using the hydrothermal method. The synthesis was performed at various pH levels (9, 11, and 14), with a concentration of 2% mol of Ta. The shape and photocatalytic effectiveness of TZ materials are greatly influenced by the pH of the solution. The surface morphology (SEM) experiments revealed the formation of rods at a pH of 9. However, the morphology and size of the rods were not consistent. Nevertheless, their structure and dimensions become more distinct and consistent when the pH is equal to or greater than 11. In addition, the impact of the pH of the synthesis solution on the photocatalytic activity of the TZ material was investigated by examining the Rhodamine B (RhB) decomposition reaction. The findings indicated a positive correlation between pH levels and the effectiveness of photodecomposition, with higher pH values resulting in a steady increase in efficiency. The RhB breakdown efficiency of TZ14 particles, produced at pH = 14, was much higher than that of undoped ZnO, with an approximate increase of 2.5 times. In addition, the impact of RhB concentration and catalyst content on the effectiveness of RhB photodegradation was also investigated.
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