image: (a) SEM micrograph; (b) HR-TEM micrograph; (c) EDAX analysis; (d) 2D elemental mapping of Sodium-manganese oxide.
Credit: Korea Institute of Civil Engineering and Building Technology
Over the past decade, fine dust conditions in Korea have worsened, as perceived by the general public, with an increase in the number of days per year featuring high-concentration fine dust. Additionally, the previous maximum fine-dust concentration level has been surpassed. In response, the Korean government has expanded its financial investment in efforts aimed at addressing fine-dust issues.
Fine dust consists of particles that are too small to be seen with the naked eye. When these particles enter the human body through the skin and respiratory system, they can cause various diseases. According to a survey conducted by the Korea Environment Institute, three in ten people in Korea have experienced fine dust-induced diseases. Notably, NO2 and NO, among the main components of exhaust gas, are known as sources of fine dust.
Against this backdrop, the Korea Institute of Civil Engineering and Building Technology (KICT, President Kim Byung-suk) has developed a material for key components that can absorb NOx and SOx in an eco-friendly and efficient manner.
Currently, selective catalytic reduction (SCR) and flue gas desulfurization (FGD), based on oxidation-reduction reactions, are among the most widely used methods to remove NOx and SOx in the field. These techniques, however, require large amounts of thermal energy and high temperatures. Simply put, they are high-energy-consuming methods.
As an alternative, the ‘Environmental Nanomaterials Laboratory’ under the KICT's Department of Environmental Research has recently developed a material that can immediately mineralize pollutants via a complex mechanism in which SOx and NOx is easily adsorbed and oxidized at room temperature. Another advantage of the state-of-the-art nanocomposite material developed by a research team led by Dr. Jiyeol Bae is that it can be regenerated for recycling through simple chemical treatments, so that it can be repeatedly reused.
This ceramic nanomaterial, composed of sodium-manganese oxides, is a hybrid material that combines adsorption and oxidation reactions, which chemically absorbs SOx and NOx while immediately mineralizing them into sulfate ions and nitrite ions. The research team published the world's first paper on materials capable of mineralizing acid gases at room temperature. They will continue their study to make the developed material more widely applicable as an energy-efficient and eco-friendly solution for efficiently reducing SOx and NOx gases.
Dr. Jiyeol Bae, who led this project, said, “With the development of this novel nanomaterial, it is now possible to implement a system that can reduce fine-dust precursors from urban environments in an eco-friendly and cost-effective manner. All these efforts will help the general public enjoy clean and healthy air.”
###
The Korea Institute of Civil Engineering and Building Technology, a government-funded research institute with 40 years of extensive research experience, is at the forefront of solving national issues that are directly related to the quality of the people’s life.
The research was supported by the Ministry of Science and ICT, of the Republic of Korea. An article explaining the results of this research was published in the 13 issue of Scientific reports this year, a renowned international journal in the environmental and chemistry field (IF:4.997).