NiO/AC and Co-doped NiO/AC photocatalysts with different Co concentrations (3, 5, 7.5, and 10%) were synthesized via the hydrothermal technique. The catalysts are labeled as NiO/AC, Co(3%):NiO/AC, Co(5%):NiO/AC, Co(7.5%):NiO/AC, and Co(10%):NiO/AC. In the presence of these catalysts, photocatalytic degradation measurements of methylene blue (MB) were performed and it was determined that the catalyst with the highest degradation efficiency was Co(3%):NiO/AC. In the presence of Co(3%):NiO/AC photocatalyst, the effect of different parameters such as dye concentration, photocatalyst amount, and system pH on the photocatalytic degradation reaction was investigated. Moreover, the effect of Co-doped metal on the crystalline size and bandgap of the hexagonal NiO/AC was studied. It was observed that the crystalline size of Co(3%):NiO/AC photocatalyst is greater than that of NiO/AC, while the energy bandgap of Co(3%):NiO/AC photocatalyst is narrower than that of the NiO/AC.

通过水热技术合成了不同Co浓度（3％，5％，7.5％和10％）的NiO / AC和Co掺杂的NiO / AC光催化剂。催化剂标记为NiO / AC，Co（3％）：NiO / AC，Co（5％）：NiO / AC，Co（7.5％）：NiO / AC和Co（10％）：NiO / AC。在这些催化剂的存在下，进行了亚甲基蓝（MB）的光催化降解测量，确定降解效率最高的催化剂为Co（3％）：NiO / AC。在Co（3％）：NiO / AC光催化剂存在下，研究了染料浓度，光催化剂用量和体系pH等不同参数对光催化降解反应的影响。此外，研究了钴掺杂金属对六方NiO / AC晶体尺寸和带隙的影响。观察到Co（3％）的晶体大小：