In this investigation, a novel 3D flower like ZnO/MnV2O6 heterojunction was successfully constructed via facile hydrothermal method, and employed to remove most consumable imidacloprid pesticide and photocatalytic deterioration of methylene blue (MB) and methyl orange (MO) dyes from aqueous system. The photocatalytic activities of the heterojunction samples with different dosage amount were estimated by UV-vis spectroscopy. Nearly, 95.2% of MB and 91.8% of MO dye was break down in 60 and 90 minutes, respectively. The 3D flower like ZnO/MnV2O6 heterojunction demonstrated great percentage adsorption for imidacloprid, with 99% removal in 200 minutes. The effect on adsorption of diverse set-up like pH, contact time and adsorbent dosage was investigated. The removal efficiency was observed at pH 4 with 0.03 g of adsorbent. The kinetic data was fitted into pseudo first and second order, and intraparticle diffusion kinetics models. It was observed that the kinetic data for adsorption of imidacloprid on ZnO/MnV2O6 adsorbent fits better into pseudo second order kinetic model. The adsorption isotherms fit well into Langmuir adsorption isotherm model than Freundlich and Temkin models. The maximum adsorption capacity of S-I (0.01g), S-II (0.02g), S-III (0.03g) & S-IV (0.05g) samples was observed as 81.3, 89.3, 128.2 and 147.1 mg g -1, respectively.