The research work demonstrates the facile fabrication of nickel molybdates (NiMoO₄) nanocatalyst via greener approach using moringa oleifera extract as chelating agent. The phase and crystalline structure, functional groups, morphology were characterized using characterization tools. The XRD patterns confirms the monoclinic phase structure of α-NiMoO₄ with the crystallite size of ~18 nm. The existence of Ni 2p, Mo 3d and O1s energy levels characteristics in the synthesized nanocatlayst was determined from the XPS analysis. Then the prepared nanocatalyst (α-NiMoO₄) used as active material to degrade the methylene blue (effluent dye) under visible light and solar radiation. The photo-degradation efficiency of MB achieved to be 91% over the optimal nanocatalyst (NiMoO₄) under solar radiation condition over 2 h and 81% for visible light under the same condition. Pseudo first order reaction rate constants of NiMoO₄ for both visible light and solar light irradiation are determined to be 0.01387 min⁻¹ and 0.01902 min⁻¹, respectively.

研究工作证明了使用辣木提取物作为螯合剂通过更环保的方法轻松制造钼酸镍 (NiMoO ₄ ) 纳米催化剂。使用表征工具表征相和晶体结构、官能团、形态。XRD 图案证实了α-NiMoO ₄的单斜相结构，晶粒尺寸为~18 nm。从 XPS 分析确定合成的纳米催化剂中 Ni 2p、Mo 3d 和 O1s 能级特征的存在。然后制备纳米催化剂（α-NiMoO ₄) 用作活性材料，在可见光和太阳辐射下降解亚甲蓝（废水染料）。MB的光降解效率在太阳辐射条件下超过2小时达到了最佳纳米催化剂（NiMoO ₄）的91％，在相同条件下对可见光的光降解率为81％。NiMoO ₄对于可见光和太阳光照射的伪一级反应速率常数分别确定为0.01387 min ^-1和0.01902 min ^-1。