AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Effects of Defects on Adsorption Characteristics of Magnesium Oxide Nanoparticles Synthesized through Aerosol Processes to Gas Air Pollutants
KYUNGIL CHO, Changhyuk Kim, Pusan National University
Abstract Number: 402 Working Group: Control and Mitigation Technology
Abstract Gaseous air pollutants in flue gas such as sulfur oxide (SOx), nitrogen oxides (NOx) and carbon dioxide (CO2) are regulated because of their adverse effects on the human health and environment. One of the technologies to reduce these contaminants is adsorption and magnesium oxide (MgO) has been investigated intensively as a gas adsorbent. In addition, MgO nanoparticles through aerosol processes can enhance the adsorption efficiency due to the large surface area. In this case, MgO nanoparticles also have intrinsic defects caused by rapid reactions in the air, which have been reported to change optical characteristics of the nanoparticles before. However, the effects of the defects on the adsorption characteristics so far have not been known well. Therefore, the objective of this research was to investigate the effects of the defects of MgO nanoparticles synthesized by aerosol processes on the adsorption characteristics to the gaseous air pollutants. The morphology and crystallinity of MgO nanoparticles synthesized through the self-combustion were analyzed by the scanning electron microscopy and X-ray diffraction, which showed cubic shaped pure crystalline MgO nanoparticles, compared to irregular shapes of commercial one (Sigma-Aldrich Co.). For the adsorption experiment, both self-combustion and commercial MgO nanoparticles were placed in a reaction chamber, and then the chamber was purged with target gases (100% CO2, 10ppm SOx or NOx mixed nitrogen) at 1 atm and room-temperature. After adsorption process, quantitative analysis of Thermogravimetric Analysis (TGA) and Gas Chromatography (GC) were conducted to determine the amount of target air pollutants adsorbed on the nanoparticles. Temperature range for the TGA method was between 25 and 800 ℃, and an acid treatment was applied for the GC analysis. Adsorption performances of the two pure MgO nanoparticles are presented, and the effect of defects on the adsorption characteristics will be also discussed.