Experimental Investigation of the Effect of Nano Heavy Metal Oxide Particles in Piperazine Solution on CO₂ Absorption Using a Stirrer Bubble Column

Abstract

In this work, absorption of CO 2 into a nanofluid of TiO 2 , ZnO, and ZrO 2 in piperazine solution was investigated experimentally in a continuous stirrer bubble column. The dosage range of nanofluids was 0.01 to 0.1 wt% in the experiments. The process parameters, such as nanoparticles type, solid loading, and stirrer speed, were varied to the hydrodynamics and absorption performance, including gas holdup, Sauter mean diameter, CO 2 loading, CO 2 removal efficiency, absorption rate, mass transfer flux, and overall mass transfer coefficients. The results showed that the nanoparticle mass fraction and range of stirrer speed have an optimum value for the above-mentioned performance. The optimum value of TiO 2 , ZnO, and ZrO 2 nanoparticles were 0.05, 0.1, and 0.05 wt%, respectively. The maximum absorption rate of TiO 2 , ZnO, and ZrO 2 compared with that of pure Pz solution was 14.7% (0.05 wt%), 16.6% (0.1 wt%), and 3.7% (0.05 wt%), respectively. Also, with an increase of the stirring speed, the absorption performance increased first up to 200 rpm and then it starts to decrease after 200 rpm. The hydrodynamics studies indicate that the gas hold-ups increase and the Sauter mean diameter decreases in the bubble column with increasing nanoparticles to the base fluid.

Exploiting response surface methodology (RSM) as a novel approach for the optimization of carbon dioxide adsorption by dry sodium hydroxide

“…Meeting the humankind's needs, with the constant growth in the world population, has led to the ever‐increasing use of fossil fuels as well as a gradual increase in industrialization . This furthermore has led to an enhancement in the concentration of greenhouse gases such as CH 4, CO 2 , and NO x , resulting in global warming.…”

“…The Intergovernmental Panel on Climate Change (IPCC)’s fourth report has recorded an increase of 0.74 °C in the average global temperature during 1906–2005. The average temperature is also further expected to increase up to 6.4 °C till 2,100, resulting in an increase in the sea level of up to 59 cm …”

“…Carbon dioxide (CO 2 ) is one of the most important greenhouse gases, and it is principally released during fossil fuel combustion . The growing environmental concerns over global warming and climate change have prompted a global exploration effort to stabilize the atmospheric concentration of CO 2 and mitigate the unfettered release of greenhouse gases into the atmosphere .…”

Piperazine‐modified activated alumina as a novel promising candidate for CO2 capture: experimental and modeling

“…Energy production and greenhouse‐gas emissions have a direct relationship in power plants and energy‐generation systems. Different technologies have been developed to break this connection by reducing CO 2 as a major greenhouse gas . Among existing technologies, adsorption is indicated as one of the most propitious methods in practical applications due to low cost and simplicity of use in a relatively wide range of temperatures .…”

“…Different technologies have been developed to break this connection by reducing CO 2 as a major greenhouse gas. [1][2][3] Among existing technologies, adsorption is indicated as one of the most propitious methods in practical applications due to low cost and simplicity of use in a relatively wide range of temperatures. 4 Various solid adsorbents like zeolites, silica gel, activated carbon (AC), activated carbon fibers (ACF S ), activated alumina, metal organic frameworks (MOF S ), carbon nanotubes (CNT), graphenes, porous silica, porous polymers, and metal oxide carbonate materials have F Fashi et al…”