Venturi has long been considered by the industry for its high efficiency and low initial cost, and has found a significant place in the removal of gas and solids in the gas phase of various industrial units. Therefore, considering the increasing importance of global warming and the effective role of venturi scrubber in the removal of gaseous pollutants, this thesis examines the experimental investigation on using of magnetic nanofluids in carbon dioxide gas absorption process in the presence of electromagnet. In this regard, the effect of four parameters of gas velocity, liquid flow rate, volumetric nanoparticles concentration and CO 2 input into the system and the effect of three magnetic intensities in the downward direction were investigated. The results indicate a positive effect of the electromagnetic field and magnetic Fe 3 O 4 nanoparticles in the process of CO 2 absorption. In the same conditions, the removal of carbon dioxide from inlet air reached 18.1% while it was eliminated 10.1% for water and without magnetic field. On the other hand, it has been seen that the pressure drop decreases from 1470.9 Pa to 1323.81 Pa by the increasing of magnetic field intensity up to 5120.46 gauss, due to the changing in the shape of the droplets and reduction in friction loss consequently. Increasing of the electromagnetic field intensity causes carbon dioxide absorption due to the increasing in turbulence and Grazing effect intensity and high mass transfer coefficient in result. According to the experimental result, increasing gas velocity and nanoparticles volume concentration in the presence of electromagnetic field and increasing the gas flow rate and liquid flow, without magnetic field, respectively, have the largest share in removal percentage. Keywords: Venturi scrubber, Magnetic nanoparticles, Electromagnetic field
